Do you have any data on the grade of steel for the prop Shaft? Andrew
Campbell. NZ
No not for sure. It was built seventy years ago. Probably 4130. It is
way over kill for the TTC as it was the main shaft for a helicopter.
4130 has been around since the 1930's.
For the 2 rotor.... 2 inch dia, 3/16 wall 4130 tube is about right.
Paul Lamar
Thanks Paul.
That was my first choice, some seem to think that EN 8 or similar
medium carbon steels might be a good option.
Andrew Campbell.
Are you building your own gear box Andrew?
Here is an idea for a one rotor gear box.
Toyota's are sold in the millions around the world so you can probably
can get automatic transmission replacement parts in New Zealand.
Or you can just buy a Corrolla auto tx gear box in a junk yard.
This page is from an automatic transmission replacement part distributor
and is for a 84 to 87 Corrolla. The planet carrier looks much like the Ford planet
carrier used in the two rotor gear boxes but is probably smaller and lighter.
The sun gear is ideal as it has a long input shaft. If you don't have Corrolla's
let me know what you do have.
A gear box built with these parts should be good for 150 HP as long
as you have a good silicon rubber coupling. Very very important with
a one rotor.
The next trick is to abandon the traditional way of making aircraft
gear boxes. That is a long prop shaft in front of the planet carrier with
two widely spaced bearings. This is normally necessary to take
the bending loads on the prop shaft due to gyroscopic reactions.
It is even used on non geared piston aircraft engines.
If we put a flange on both side of the planet carrier and a bearing
on each flange we can do away with long prop shaft and save some weight.
The flanges will do double duty as a planet carrier. The combined planet carrier will
be ridged enough to do this and act as a long prop shaft.
Don't bother with a traditional prop flanges as ground adjustable prop
blades are widely available.
Here are a bunch of pictures and a 3D
Paul Lamar
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