Hydradrives - why the sudden increase in interest

[Northy]

When I used to calibrate viscometers we used a different oil for the higher viscosities, silicone is the best for temperature stability, but does shear thin. I can't however remember the other type of oil! I do know it was a bugger to clean off though.

I'd suggest trying some high viscosity 8th silicone diff fluids first - not 100% sure where to start though, I have hydra fluid at home so may be able to try and match it up by eye to my 8th oils?

IF you think the drive is changing during the run, then the silicone oil is probably shear thinning. However, thinking about it, another type of oil would probably be more affected by the temperature from the slipper part... mmmmmmm

Perhaps the Schumacher one was better as it could use lower viscosity silicone oil, that wouldn't be as prone to shear thinning..... I'm sort of thinking out loud here!

G

[Si Coe]

Custard

Fill your slipper with custard.

Its shear thickening!


We used silicone oils for our viscometer calibration too, but given that two different brands of viscometer could produce wildly different results with the same supposedly high grade calibration standard depending on what spindle and rpm you used I came to the conclusion that is all a bit made up really........

[Graeme]

Wouldn't it be nice if someone at Losi was reading this and it inspired a new production run! I couldn't find any on Ebay - I'm sure a shop mut have one somewhere but finding one could be a long process.

For the fluid maybe an email to Losi would uncover the mystery of what to use - I'm sure they would just have bought some off the shelf stuff which was then re-branded and sold at 10 times the price.

For the science lovers out there here's a link to the patent

http://v3.espacenet.com/publicationD...=5178251A&KC=A

[mikeyscott]

Are poeple needing the layshaft and slipper bits too?

[DaSloth]

Originally Posted by Graeme

Wouldn't it be nice if someone at Losi was reading this and it inspired a new production run! I couldn't find any on Ebay - I'm sure a shop mut have one somewhere but finding one could be a long process.

For the fluid maybe an email to Losi would uncover the mystery of what to use - I'm sure they would just have bought some off the shelf stuff which was then re-branded and sold at 10 times the price.

For the science lovers out there here's a link to the patent

http://v3.espacenet.com/publicationD...=5178251A&KC=A

when i emailed horizon UK about the hydra drive they said all the parts were still in production and they could get stock if need be, so might be worth getting your LHS to contact them to see what they can get you.

[mikeyscott]

Ooh now that sounds good. Nice new one for my XX.

[Gareth Jones]

Hello,

Can someone advise me if you need a different layshaft to put the hydra drive on a CR??

Regards
Gareth

[warped]

the xx and xxcr used the same gearbox so no need for new layshaft.

If you mean a xxx cr then I'm not certain but I'm 99% sure you'd still use the standard layshaft. - The reason being that the double slipper first appeared on the xx cr kinwald edition and was then carried over to the xxx series of vehicles, with the same plates etc.

[liam]

a guy in the losi forum told me that it ran good with 10,000 weight fluid if this helps

[Gareth Jones]

Me again!

The hydra drive is meant to locate on the flat part of the layshaft I presume?? i.e. it is meant to locate and spin at the same rate as the shaft?? if so mine doesnt as the flat part of the layshaft isn't long enough.

Can anyone advise? i have found the below diagram, of which i have all the parts - just need to figures the layshaft query!

http://www.offroad-cult.org/RC-Lexik...ra_Drive_1.gif

Regards
Gareth

[liam]

is part 3132 nearly flush with the motor plate?

if you can post up a pic of the shaft and ill tell you if its the same as mine

good luck