Hi Paul,

you think ? As you can see the ring is retained by four roll pins, is
this a good idea ?

cheers Chris Hoskins.

The role pins are a good idea. They act like 3 keyways. At that
radius the load is low. This was back in the days when people were
lucky to get 150 HP.

Paul Lamar

Hi Paul,
how do 4 roll pins act like 3 keyways?
I think the 6 or 8 tapped short screws around the peripheral are a much
better idea, especially when the ring gear is a snug fit in the housing.
Dave Mccandless in Perth


Sorry Dave! 4 keyways.  I had been working my butt off getting this RX8
water block so
the machinist is happy :-) The weight is down to .65 pound.

True the extended point set screws would work good as well.
This Ross design is 47 years old. Long before  the extended point
set screw was invented.


Paul Lamar

Paul,
Does that indicate you have enough interested customers to
build a batch of the RX8 water block ??................

Kelly Troyer


Well I think so. The problem we are running into (I think) is the
lack of 5 axis
NC mill software and the skill of the 5 axis NC mill operator (I
think :-))

This is a tough job.

Paul Lamar


Plugs up orientation [is]  the best fit for the Q2 airframe. It points
the exhaust down, and allows for a higher thrust line without poking the
crank angle sensor out the top of the cowl. The Q2 has limited ground
clearance, and the large gear reduction begs for a longer prop. I went
with a 62 inch long, 95 in pitch two blade.
Even with that, I had a minor prop strike when the wheel ripped off the
wing.  The engine kept running, but I suspect it helped loosen the bolts
in the planet carrier.
Ground loop caused by a stuck brake.

Sold the plane because it was six years too long in construction and
over budget. I simply had enough.
Currently designing a twin engine rotary, but have a big project ahead
of it in the pipeline.
Lewis Bjork.

A few comments on plugs up. The old crank angle sensor is not really
needed anymore
and if you decide on plugs up you should be using a dry sump oil system.

Paul Lamar

Hi Lewis,
Thanks for the little bit of history on the motor Lewis, very helpful, sorry to hear about your misfortune.
Cheers Chris Hoskins.



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