In Kevin's case he needs a datum to establish engine mount length,
therefore his prop flange location is an unknown. Easier to use
firewall, LE, whatever is already there at this point.
Reading the replies got me thinking - Larry, or anybody else, is your
engine mounted with the thrustline right down the pipe? Or did you
incorporate an over-1-deg-down-1-deg TLAR adjustment some people have
found effective when installing larger, more powerful engines on
airframes designed for less power? Ex. Junior Ace, Cub/Super Cub,
Wag-A-Bond, Fly Baby. The reason I ask is this would obviously put the
prop flange out of plane.
Chris K
On 9/22/2020 1:10 PM, John Bouyea via KRnet wrote:
I KNEW this was going to start a topic discussion bearing on the likes of
nose wheel or tail wheel!
Here's my objection to using a prop flange or any other non-airframe
structural element; what happens when you CHANGE the whatever-it-is?
Make the engine mount longer, change your prop flange, use a different
spinner back plate and all your measurements go out the window.
Use the wing LE, the firewall or some other airframe structure and it never
moves.
End of my campaign...
Bou
-----Original Message-----
Subject: Re: KR> KR2 Manual Excerpt
Larry Flesner wrote:
>> I would suggest some distance from the main gear
contact point (the axle) out ahead of any point of the aircraft. That
makes all numbers positive. <<
Then Langford wrote:
the main problem I see is that you're trying to measure with accuracy to
a point that you can't hang a tape measure on. As long as you pick the
farthest forward "hard" point that's not going to change (like the front
face of the prop hub), you can then mount an aluminum angle or other
straightedge to it, rotate it to positioin it logitudinally aligned with
what you're measuring to, hang your tape measure end on it, and stretch
the tape until you nail the distance. Result, one simple directly
measured number gets written down.
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