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Building Tips and technical articles. => Building techniques => Topic started by: Douglas Ames on September 18, 2011, 07:38:43 PM
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I noticed on the prototype full fuse. Corsair plans the engine crutch is offset with an optional hinged rudder.
On the Brodak plans the crutch is straight 0/0.
Was this the result of your finds when trimming the prototype?
Did you find it necessary to cock the rudder any?
I'm installing a Saito .40 and have built the crutch 0/0, the fin/rudder was assembled faired but I can attach it at an angle if needed.
Thanx, Doug
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Doug,
The original Corsair (profile) flew with no offset and had an adjustable rudder which was offset possibly 3/8". Flew well that way. These days, I prefer just a little engine offset so that is why there was 2 degrees shown on my original plans. Brodak may have set the engine with no offset. I suspect that a zero degree offset on the engine thrust would still be good and line sweep and rudder will get things well adjusted.
I would recommend making the rudder hinged with an adjustable linkage so it can be altered to find the happiest setting.
Pat Johnston
Skunk Works.
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OK thanks!
There is NO offset shown on the Brodak plans, and the instructions tell you to glue the fin/rudder together and install straight.
My crutch is already epoxied "in stone" 0/0, but I will cock the fin/rudder a little for P-factor and line tension.
Thanx, Doug
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I'd mount the engine O/O and like Pat suggests, make the rudder adjustable. Good plan for most any good sized Stunter.
I have serious doubts about the Saito .40 being enough power for the design though, in fact I'll say it's not. I'd strongly suggest the .56 or .62. y1
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Hey Doug, How is the Corsair coming along? Any Pics? I am going to start mine soon but I have to buy a Brodak wing jig first and finish up a couple home repair projects before winter.
Keep us posted.
Rick Henry