Cobra Racing B42

[jasonrcb]

Hi all,we thought we would share our latest creation that's ready for its silverstone debut tomorrow,the car belongs to Andy Reeves and tomorrow will be the first meeting out with the car,hopefully like Steve Haskins at the last meeting Andy will have the same success with Steve jumping from the F final at round 1 to the C final at round 2 after changing from his dex210 to the cobra 4210,andy's car based on the B44/B4 all joined together with superb high quality and work of Ken Rieth aka Cobra Racing Products,here are some pictures,hope you like what you see folks.

Feel free to follow us on facebook,Cobra Racing Products for the conversions we have created so far and all the future work and new parts we have coming out in the future.

[stew_zs]

I like the look of that !!! Tried it myself recently !!! Will these be available for sale ???

[jasonrcb]

Thankyou,yes the chassis is available for sale as all of the chassis conversions we have produced so far,price for the chassis is £25+ p+p.

There are more pics on our facebook page along with pictures of other hybrid conversions that we have done so far.

[alex97]

may get one for my b44 2wd proto

[stew_zs]

Could you post a link to the Facebook page don't seem to be able to find it

[andy reeves]

Link to Cobra Racing Products http://www.facebook.com/groups/539051429511100/

I would just like to thank Ken at Cobra Racing Products for manufacturing the chassis for me.

[jasonrcb]

Thanks for posting the link Andy,see you in the morning mate.

[Wacker 3]

The conversions look amazing, hope there will be a yokomo chassis soon!

[Lee1972]

Like it, good job :thumbsup: out of curiosity what shell are you using?

[SLEENAD]

Looks like a penguin to me (have a look on ebay).

[Clarkie]

Interested to know how you got on at the stone today? I take it that it's a b4 front and 44 rear?

[jasonrcb]

All of our shells variations are made by steve at penguin and there will be another version on the way very soon.

[jasonrcb]

Very pleased with the pace the car showed today especially as it was the first time Andy had driven the car in anger,very planted and easy to drive and compared to Andy's c4.1 he way improved over the best times he managed with the c4.1

His car is built off the b4.1 and b44.1,i will be working on a new topdeck as the 2 holes that used to hold the b44.1 steering drives me nuts,it works fine but i just dont like the look of it,the only part of the car that is not associated is losi xxx wing mounts and the lipo strap

[ste_lazzaro]

Hi! Really like your creation!
One question: how much is the wheelbase long? I read you started from a B44.1, but looks as you used the frot top deck at the back.. clever!!:thumbsup:
What is needed to complete the conversion?
Chassis, body, battery strap... ??
Is there a full kit available?
Let me know, I'm really interested!!:drool::drool::drool:

[jasonrcb]

Im glad you like what you see,right firstly the wheelbase is the same as the centro which we found was a good balance to the car,it is the front deck that we used as you also use the front centre driveshaft and you flip the diff in the casing,simple to do as you just cut off the lug thats in the housing and then just turn the diff round.
At the moment there isnt a full kit available but the sheels we use are from renguin custom bodyshells so simply drop steve a message and he will sort that,(we all race together so makes life easy)the lipo strap you make yourself,at the minute we have so much work on that we dont have enogh time at the minute but may produce lipo straps in the future.
The only part on the car that isn't AE are the wing mounts as for making life simple we used losi xxx mounts,you can use kit but you have to make up a bracket to keep the bottom of the mounts together

Hope that helps,as i say this all started as something myself Ken wanted to try and its just snowballed from there,once our cars had been seen on track then people wanted so here we are with hybrids springing up from everywhere.

[ste_lazzaro]

Thanks!
Wheelbase same as C4.1 or C4.2? I found the 4.2 way better..
Why not the stock B44 wing mount?
How do you keep the pack in place? Just with the strap? nothing on the chassis?
Thanks again!!;)

[jasonrcb]

Chassis length was based on the c4.2,i prefer the losi wing mounts and as i have a few sets kicking around i used them,the chassis is milled out so the lipo sits into the chassis so no other parts needed other than a strap,pic shows the chassis before electric install

[ste_lazzaro]

Great!! Thanks! I'll get in touch for the deal..:drool:

[alex97]

do you have to use a low profile servo ?

[jasonrcb]

A std size servo will fit but its tight

[Lee1972]

Where did you get the lipo strap from?

[Lee1972]

And how did you get on at Silverstone?

[jasonrcb]

The lipo strap was made out of piece of carbon i had lying around,nothing fancy and enough to do the job.

Silverstone was good and the car went very,i think it was well above what Andy was expecting as up until yesterday morning he hadn't driven the car,qualified much higher than he had previously with his c4.1 and was so much easier to drive in his opinion,alot more to come from the car as apart from yesterday all the car has been raced on is low grip astro outdoors,the pace of the car on high grip is night and day different to a std mid motor and there is now very little to choose between them on low grip in my opinion

[Lee24h]

i would like to see a b42.2 with a carbon chassis

[ste_lazzaro]

I think you can trim the unused drive cup to fit a longer servo..

[OneKiwi]

If you maybe could look at the XB4 or yokomo mr2 conversion that would be great.
Maybe even something with the 210 front/ ? rear

[jasonrcb]

Yokomo 4wd/2wd chassis conversion is on the list and should be all sorted in the new year,i have had a look at the xray and as yet not top of my list there are ideas floating around at the minute.

If you follow our facebook link on the first page you will see we have 2 durango versions already out,firstly is the Cobra 4210 which is a full durango conversion,we also have a B410 version using the 410 drivetrain and B4 front end,both versions are going well in testing and showing good promise

[ste_lazzaro]

..Now I see the reason why you couldn't use the stock wing mount..
What P/N is the losi one?
Thanks!;)

[OneKiwi]

Would you need a topdeck with the durango rear? OR could you do some delrin/CF/alu rails?
Would the yoko conversion use the yokomo front and rear?

[jasonrcb]

The durango versions have been run with no top deck and using the correct alloy there are no bending issues and we have abuse tested the chassis,we also have a weight that bolts to the chassis that acts as rail but i found the car is not as good in the wet with the rail fitted.

The yokomo will be full yokomo front and rear,obviouysly once we have the first car out and the template made then you could have any front end you wanted really

[alex97]

are you planning to make one that can take saddle packs ?

[jasonrcb]

We have a Tamiya 511/201 that uses saddles,the belt drive cars seem better that way,i dont see a saddle/shaft drive on my list of things to try,for that just take the front diff out of your 4wd.

[andy reeves]

I have to say that for my first outing with the car it ran faultlessly all day. It had the drive of a 4wd but with a touch of under-steer. Seen as I didn't alter the set up all day I am fairly sure that I will be able to make it go quicker next time. The amount of speed that you can carry through the corners with these cars is scary.

[Jamie B4]

Congrats guys Andy,Jase,Ken had a quick look at it but didnt see much as he was in the heat before me and my final but believe the speed he could carry was very impressive

[ste_lazzaro]

I found part LOSA4222 for the XXX CR.
Is this the right one?
Unfortunately it looks no more available in the UK.
Suggestions?:confused:


..Now I see the reason why you couldn't use the stock wing mount..
What P/N is the losi one?
Thanks!;)

[jasonrcb]

Thanks Jamie,we appreciate your comments and thanks for taking the time to have a look,see you trackside again soon

[jasonrcb]

I would say that a call to DMS racing and you may find he will have the wing mounts,he still carries a good supply of older losi parts,ebay i have seen them come up on there.

You can use ansmann/teamc,kyosho,durango,tamiya mounts by drilling an extra hole in the tower

[Tom3012]

Can you buy the b4, b44 version yet?

[stew_zs]

Tom,

I placed a order with jason recently for it :thumbsup:

He said first batch is being made

[jasonrcb]

Hi Tom,yes they are available abd as stew says the first batch is being made as we speak,im not sure we can get anymore made before xmas as the response has certainly suprised us all:thumbsup:,xmas postage also comes into play which is a pain in the rear.

I can certainly add your name to the list if your interested

[Tom3012]

Definately would like to try one, got both donor cars say doing nothing... Im in no great rush, well there be a version with the top deck thats been mentioned?

[jasonrcb]

No problem Tom,i'm going to do a top deck over xmas and test it,if it improves the car then it would be something we could do,i really only want to do the deck as i think it looks ugly with the 2 holes on show,if i can get andy's car back im going to modify his top deck as that could be an option also

[Tom3012]

Im a sucker for things looking right so id be all up for a top deck, i got my TM2 anodised black because i didnt like the orange :lol:

[jon kedge]

Seen as this thread is getting bigger i,ll add to it aswell.

Have had chassis from ken and have put on a hpi cyber 10 rear(i race these anyway)using standard parts with saddle and either a b4 front or a madrat front,used madrat as iv'e got 2 complete cars and used a c4.1 chassis shape to get undertray and shell sorted. Went together well just waiting for low profile servo and shell and it should be on face book in the new year with jason bennet paintjob(madcow design)so watch there facebook for pictures.. jon kedge:thumbsup:

[Lee24h]

Is there a plan to deal with the front centre outdrive?

[jasonrcb]

You can cut it down if you want but it doesn't cause any issues,it was left like that as it wasn't my car to cut up,although i was very tempted

[Lee24h]

i can just see the servo wire meeting the outdrive

[jasonrcb]

I wouldn't take any notice of that wiring job,the wires are all now fixed to chassis and are no where near the outdrive,my frsky reciever fits underneath with no issues,im fairly sure everyone with the cars now have wired them to have no issues.

[jasonrcb]

No worries with the wires near the outdrive

[ste_lazzaro]

Done!!
At the moment with small bore shocks and rear shocks at the front of the arms.
Isn't it nice?? :wub:wub
http://farm6.staticflickr.com/5533/11911339823_d3721d9c47_c.jpg
http://farm4.staticflickr.com/3753/11911062335_cbb1cb6990_c.jpg
http://farm8.staticflickr.com/7380/11911950236_76372171ee_c.jpg

[stew_zs]

What body is that I want one for my cobra

Stew

[ste_lazzaro]

Penguin RC
:thumbsup:

[stew_zs]

What car is it made for !! Is it there mid motor one ??

[jasonrcb]

Great job on the car mate,really does look good.

Thats the new shell for the cobra range,drop steve haskins a message and he will sort you out,he is working hard on shells at the minute

[andy reeves]

Car is looking good Ste, Just to let you know that I am now running the shocks on the front of mine. Car was good at the weekend, shame the driver let it down.

[ste_lazzaro]

Thanks guys! I will have the first test this friday at West Bridgford indoors carpet track. I am so curious about how will it go!! :thumbsup:

[discothesnake]

Hi there. Loving these conversions. Out of interest, which Yokomo 4wd are you basing the conversion on?

Dave

[jasonrcb]

Hi Dave,we have the bmax 2 4wd which a good few have shown interest in and if needs be we will also go down the 3 route,what we do is not always use the latest stuff but instead bring life back to the older version of the cars,if the 3 is a workable option then yes that would also be looked at

[discothesnake]

I was hoping you'd say the older version as I have one that probably won't get used. Keep me updated how it's going.

Many thanks.

[jasonrcb]

Thats what others have also said and will be where we will start,i will keep things updated as we go on here and on our facebook group

[ste_lazzaro]

Hi guys!! First feedback from the track:
Let's start saying that I really like my C4.2, well balanced, predictable and quick.. but..
I first put the B4.2 on track (carpet) last friday, with "good sense" set up, and I was immediately faster!:thumbsup:
I run 70% staggers at fron and less than 50% minipins at the back.
No matter this traction was good! Of course tons of steering for a very nimble behaviour.
I could plently use the 6.5 motor.
I am very happy!!:wub:wub

[jasonrcb]

Pleased to hear your happy with it Ste :thumbsup:,

Thanks for the feedback and by the sound of things you enjoyed the car on it's first outing,keep us updated with how your getting and any setups you find that may help others.

[cutting42]

Thinking of going this route. Have you considered weighting the propshaft to get a contra rotating weight to the motor?

[ste_lazzaro]

..Second club race and second great feedback for you guys!
The car is awesome, so fast and so easy to drive and push hard!
My setup at the moment is:

Rear:
Small bore AE shocks, piston #1, 30wt oil, green springs.
Inner hole on tower (B44 tower, with 2 holes), outer hole on arms.
0.5mm washer under camber link.
Camber link 64.0mm, center hole on hubs, inner hole on chassis.
B44 87g ballast installed.
Thick swaybar.

Front:
Small bore AE shocks, piston #2, 35wt oil, silver springs.
Inner hole on tower, outer hole on arms.
2.0mm washer under camber link.
Camber link 67.5mm, inner hole on hubs, inner hole on chassis.
Steering links 72.0mm, front hole on rack.

Ground clearance about 20mm.

Nothing special actually.. I think the "secret" is in the weight distribution.

I had fun pushing it harder and harder.. up to doing some mistakes :blush:, but lap times are going down!!:thumbsup:

[jasonrcb]

Superb Ste,it just gets faster and better mate,lol at the secret,could be the material that's used lol;)

[jasonrcb]

Just an update as to what's happening,we have not forgotten the B42,at the moment we have a few new chassis's on the go but we will soon be back in full swing,the first yokomo chassis is now out(see yokomo forum)and the xray will be ready very soon,all orders will then be caught up along with a few idea's that we still have in the pipeline.

[Clarkie]

Hi guys

Currently doing this conversion and was wondering the reason for flipping the diff, don't have a problem doing it just want to understand why? I'm using the rear transmission with the front input shaft

Cheers
Paul

[cutting42]

Because when you move the motor to the opposite side as with the Cobra layout, the direction of travel reverses. So have to flip the diff round to make the drive run in the correct direction again!

[alex97]

I cant wait to get mine, any idea on how long. will a b44.2 shell fit ?

[jasonrcb]

No the B44 shells wont fit,speak to steve at Penguin custom bodyshells as he does all of the range of shells to fit all the Cobra cars,i will message you when your chassis is ready

[alex97]

thanks

[ste_lazzaro]

Well, actually the B44.1 body fits pretty easily, don't know about the B44.2 one.
Chassis width is compatible, yet the front looks a bit fat.
Of course it will never look as nice as the Penguin body..

[jasonrcb]

LOL well your right ste the b44 shell will fit at the back but it does look a right pig and a poke at the front,stick with a shell thats made to fit

[Clarkie]

How do you fit the b4 front end am I missing some pillars to mount the top age to chassis? Maybe I'm better of with a kit in a box... Lol

[jasonrcb]

Centro front posts most people use,

[learnerdriver]

How do you fit the b4 front end am I missing some pillars to mount the top age to chassis? Maybe I'm better of with a kit in a box... Lol

as jason says , centro front posts come in steel or brass ;-)

[Clarkie]

Cheers

[learnerdriver]

Cheers

all the other parts are standard associated b4 or b44 :-)

i made my battery strap from 3mm abs with carbon effect

i am hoping to have mine ready for the bwoc if you are about on the sat ;-)

[Clarkie]

all the other parts are standard associated b4 or b44 :-)

i made my battery strap from 3mm abs with carbon effect

i am hoping to have mine ready for the bwoc if you are about on the sat ;-)

Cheers

I'm not booked in for this but I'll try and get down there at some point in the day

[jasonrcb]

I will also be down on the saturday so we can have a catch up then,anyone is welcome to come over and check the cars out,i wont be hard to find

[andy reeves]

There will be a few cars about at the BWOC so come on over and have a look.

[Tom3012]

Here's mine ready for a play tomorrow!

http://imagizer.imageshack.us/v2/640x480q90/849/mvt3.jpg (https://imageshack.com/i/nlmvt3j)

http://imagizer.imageshack.us/v2/640x480q90/713/ibk7.jpg (https://imageshack.com/i/jtibk7j)

[jasonrcb]

Nice work mate,good luck with it's debut tomorrow:thumbsup:

[Tom3012]

Cheers! Need to tidy up the wires and paint the proper bodyshell but I'm looking foward to it :thumbsup:

[ste_lazzaro]

Some time has passed since last time I wrote it, so worth reminding that this car is awesome!
I am now using big bores at the rear end (TLR, with AE cups): they weight 15g more but work better.
I also installed the gear diff, which is another 10g more.
The package behaves very well!!
I am thinking of playing a bit with the ballast, maybe removing some grams from the 87g "brick"...
:thumbsup:

[jasonrcb]

Thankyou Ste were pleased to see your still going well with the car.

UPDATE,Cobra B42 wins the silverstone winter series,the car was only used at the last 3 rounds and took TQ at every round it was used,it's fair to say were rather pleased lol:thumbsup:

[ste_lazzaro]

Right.. Awesome!!
Is it possible having posted any setup updates?
Thx!!!

[gixxer]

Hi are there any plans in the future to use kyosho lazer and rb6 or rb5 front ends? I have x loads of kyosho bits kicking about

[Clarkie]

Not sure if I'm best posting this here or not. However I'm having a issue with my centre shaft pin coming out through the side of the retaining O ring. I have noticed that when I set the slipper the centre drive shaft is VERY tight and this seems to upset the geometry of the shaft pushing it out of balance. I have removed the shaft and slipper shaft to ensure that they are straight and true which they seem they are.

Is it normal for the centre shaft to be tight with no play?

[jasonrcb]

Is this on our chassis?,there should be be some play in the shaft,not heard anything like from anyone or any of the b42s that i have built

[Clarkie]

Yep one of yours, maybe I'm doing something wrong, when I tighten the slipper the slipper shaft moves to the rear putting pressure on the centre shaft, wonder if new slipper pads might help so I don't need to set it as tight?

[jasonrcb]

All i can suggest is go over the build and check everything,i can lock my slipper and still have play,checked with a couple of other guys and they have play in there's.

[ste_lazzaro]

Don't know if I understood well, but chances are the issue is in the front outdrive, where the shaft is missing.
You need to put the pin in and set the correct stack. Go to previous page and look at pics of my car.
As you tighten the slipper the shaft is pulled backwards, and the front pin/stack shall react the load.

[Clarkie]

Don't know if I understood well, but chances are the issue is in the front outdrive, where the shaft is missing.
You need to put the pin in and set the correct stack. Go to previous page and look at pics of my car.
As you tighten the slipper the shaft is pulled backwards, and the front pin/stack shall react the load.

That's exactly what it was I had completely removed it.. I have now put it back on cut down!! Worse thing is I've been running it like it all weekend :cry:

Thanks for your help guys!!!!!:thumbsup::thumbsup:

[jasonrcb]

Ste to the rescue,memo for everyone,don't remove your front outdrive cup and just leave it empty

[ste_lazzaro]

Yes, I removed the overdrive as was worried about possible clash with the standard servo. Low profile servo = no issue!

[OneKiwi]

Can you buy the b4, b44 version yet?

OR is it just for the B44.1??

[blackburn]

Hi, ive nearly completed my b42 build and was wondering if anyone had any setup tips for a good starting level ground. Also i have noticed in pictured that some people have mounted the rear shock inwards and others have reversed the shock tower so the shocks are on the back, which is the best option?

Thanks

[RDG 40]

Hi, ive nearly completed my b42 build and was wondering if anyone had any setup tips for a good starting level ground. Also i have noticed in pictured that some people have mounted the rear shock inwards and others have reversed the shock tower so the shocks are on the back, which is the best option?

Thanks


Ditto jus in process of buildin mine, the chassis is very high quality !!

Ive just noticed if you run normal way you need to drill the top deck for one of the three screws orher than that so easy to build

[jasonrcb]

Firstly good luck both of you when you get the cars on track,i started off running the shocks on the rear of the car as it's said that way the car generates more rear end grip,i now run the shocks in the normal position as the 1 thing the car doesn't lack is grip and the shocks on the front makes the front end feel much more active.

Setup wise whether i'm using small or big bore i run them on pretty much the same setup,i don't race indoors so you may find you need to tweak things more to suit,oil wise my normal is 32.5f and 27.5r,piston wise on big bores i use 1.5f and 1.6r with losi pink or yellow rear springs and blue on the front,small bore 2 hole front and 1 hole rear,springs,green or silver rear,blue or silver front i think,been a long while since i used small bore,bumpy tracks i tend to run the centre ballast weight and from time to time the front brass bulkhead but that's personal preference as some of the other guys dont run any weight although it's close to the minimum weight limit like that

[ste_lazzaro]

Here is how my B42 looks at the moment..
I reduced the ballast from 87g to 52g.
Since I'm using a rather thick anti-roll bar, I softened the rear shocks: oil is Losi 27.5, pistons Losi 55, springs Associated BB white.
..And I am running foams on carpet.
The rear upper plate is made out of fiberglass, same weight, better looks.

Feels so good!! :thumbsup:

[nexus.1]

Just got my chasis delivered, any tips for the build?

[jasonrcb]

From a personal point i run the ballast weight and use a brass bulkhead if i feel the car needs it,shocks wise i have run big bore and small bore and on both i have used the same weight oil,32.5 front and 27.5 rear,other than that the rest of the setup has been how i have taken the parts off the donor cars so front and back end links would be pretty close to kit manual setup.

I cant think of any other changes i have made but it has been a few weeks since the car has been on track,i have been side tracked working with the 4wds and the mid motor cars

[nexus.1]

Is there a way of contacting the guy for a penguin shell or is it only through ebay?

[jasonrcb]

You can contact him on here,username is steve haskins

[nexus.1]

are the front and rear b44 diffs the same?

[RDG 40]

They are yes

[adz2383]

Hi chaps,

I am finally getting around to building my Cobra B42 (b44.1/b4.1).

I have noticed that some of you run the rear shocks on the back of the wishbone and some run them on the front of the wishbone.

Is there a benefit of position over the other?

Cheers

Adz

[RDG 40]

Im same just sorting shell. How do you all mount front end? Im using the b44 mount at back but unsure on front.

Cheers

[jasonrcb]

I found with the shocks on the rear it gave more rear end grip and took a little front end away,i changed to the shocks back in front and the front end was superb and felt really locked in,i added the ballast weight in the spine of the chassis and that gave plenty of rear end,for me now shocks on the front

Mounting the shell i have just bent some lexan and stuck it to the chassis on the front,then just use velcro and a bodyclip to hold the rear on