12 c
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
I did a bit more research on suitable gear boxes that are likely to be found
overseas.
The RX7 had a scaled down Ford automatic gear box built by Jatco in Japan.
A joint venture with Ford and Toyota.
That was also used by Nissan 200SX, 240ZX, 280ZX , 610,710, 810, Pathfinder,
and Pick up truck, Mazda Pickup and the RX3 and RX4.
All the work we have done so far on the Ford parts can be just scaled down.
Paul Lamar
I was talking to someone a few weeks ago who has a Ross PSRU. I asked him to weigh it
for me and he said it weighs 12 pounds. Lewis Bjork used the Ross on the Cosmic
Fish, and he says he’d do it the same way again. Is there detailed set of drawings
somewhere that can be used to resurrect the Ross?
Aeromomentum says they’ve manufactured quite a few of their Suzuki reduction drives,
which include a fair amount of dampening. The drives have a good reputation. They
weigh 21 pounds and cost $1800.
Dave Klingler
He was wrong. The Ross weighed more like 30 pounds. The steel parts alone
are about 12 to 15 pounds.
No detailed drawings but Both Tracy and now Neil Unger are building pretty much
the same thing. Only details vary.
The spur gear Aeromomenetum are one sixth as strong as a planetary with the same
gear width. There are no drawings for the aeromomenentum that I have seen but
it does not have a planetary. All radial aircraft engines in WW II had planetaries
including the corncob engines on the Spruce Goose.
No Suzuki engine that I know of is making 250 HP. I know of a guy that
died with a Suzuki engine. It would not climb out of ground effect on first
flight and he hit a tree.
Paul Lamar
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