coolice
Key Veteran
Location: Northamptonshire, England
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| Backlash - do I understand this term correctly. If you hold one gear still , is backlash the amount of back and forth movement you can get if you try and turn the other gear back and forth? does that make sense?
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Hey,
Yes that is it in a nut shell, backlash is the amount of movement a gear can make against another which is held still.
You need a small amount, during any meshing of gears a little backlash is good.
A quick way of setting gearmesh in other areas is with some very fine paper if you are not confident doing it by eye.
Ritzla (spelling?) paper for instance is good as it is very thin.
When it comes to oil WREN also recommend a specific gearbox oil availabel from any Halfords/Car store etc. But for the life of me I cannot remember what it's called, sorry.
Some of WREN's staff are away at Jet Power this weekend but a quick email to Sara next week will no doubt reveal what oil it is.
......... just thinking to myself, the name "Hypoid" Oil comes to mind as this is in the back of my head, but I cannot explain further.
I am still using dedicated Turbine oil and will do until the supply I have runs out then I may switch.
With regards to the differing views on tail mesh setting, Ross knows that the location of the pinion on the shafts flat spot is of no importance, it is the addition of shims either in front or behind the gear which actually moves & holds it in a different position which counts.
The shaft can be protruding through the gear slightly with no adverse effect on the gear mesh, unless it fouls another point within the gearbox.
Your doing well to get everything all lined up ready to fit, that way there is no scrabbling aorund later on trying to find parts you need.
I dont see the 710's being a major problem on the model, Rotor Techs are only 720mm standard. However it is the outer section of the baldes which does the most work as it is spinning the fastest and inturn making the most lift.
Many of us as you know have moved onto 800mm+ main blades so as to lighten the disk loading of the model, of course the boom length needs to alter as well to compensate.
Once you have the model flying, while you are hovering you will get the feel for the blades you are running and decide from there.
I do feel it is a shame you cannot buy (I am yet to see any) a blade length of say 760/780mm, inbetween the RT 720's and the 800's~810's.
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Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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