ram3500-RCU
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From: n. canton,
OH, USA
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ORIGINAL: Rob Howarth
Guys,
I'd be very grateful of some assistance please.
I took delivery of my Corsair plug in wing ARF yesterday and have been working through the parts supplied. I have a few questions that others may be able to assist with;
1 - What are the parts in the attached picture?
2 - I cannot see how the attachedment of the outer wing panels to the main centre wing panel section is supposed to be. Any ideas?
3 - I would like to run two 8711 elevator servos and need the stabs to be detatchable (they seem to have done this in the factory for the stabs) yet, how are the elevators detachable? Even if I cut the supplied carbon control rod for two servo operation I see no way that these can be attached to the elevators apart from bonding them in. Therefore, how are you supposed to remove the whole stab and elevator section? Tap holes in teh elevator l/e and through the carbon rod?
4 - The fin seems to have only one hinge at the top and then the base ball raced hinge. Is this adequate and normal?
Any useful help that can be offered here would be gratefully received.
Thanks,
Rob
Hello Rob. Sam and others have already gotten a good start on your questions.
One the liners, we discard them. They serve no practical function.
I can help you with the stabs I think. They can indeed be removable.
Before I address that, a comment about the elevator servos. I am a believer in redundancy in aviation, as most of us are, but in this case, I just do not see the need for the second elevator servo. I use the JR 8711 on the elevator. A servo with over 400 oz of torque, and some of the best gearing on the market. This servo is more than up to the task in the tail of the Corsair, a plane that is sensitive to elevator in the first place and only requires small travel in normal flight. The push rod is very short and the linkage is very tight. Now connect this servo to a carbon fiber torque rod that is common to both elevators, and you have very positive control with no possibility of differential in the two elevators. Add to that the fact that, for that one extra, heavy, servo in the tail, you will need almost a half pound of ballast in the nose, and it just does not make sense. Now if a guy was to want to use two lessor servos instead of one expensive good one, maybe, but why would you do that? My recommendations, use one 8711 (you already have great servos for this) or equivalent on the elevator, and leave the carbon fiber torque rod in one piece.
OK, back to the elevators. They slide onto the aluminum spar and carbon fiber torque rod that drives them. Both get drilled and taped for cap screws that (1) in the case of the spar, hold them in place (I install wood in the aluminum tube and drill and tap the whole thing instead of the blind nut plan CARF shows you), and (2) in the case of the CF rod, align and drive them. This means that on the underside of the tail you will have (2) cap screws on each side. One for the elevator drive, and one for the main spar to hold the stabs in place. This makes them removable, by simply removing these for bolts.
A builder can choose to glue them on permanently, but remember, CARF replacement part's fit perfectly. Any of these parts could be replaced in the event of an accident.
The rudder. The rudder design is wonderful. It has only two bolts on the top of the stab keeping it in place, but these work great. The bottom slides over another of those wonderful carbon fiber rods that drives the thing with a tiller affair. It has a brass tube that holds the top hinges in place. Very simple, very strong. Do not worry about this arrangement. It will be the last of your concerns on flying days.
As for the wings, they are held in place the same way the stabs are, cap screws / bolts threw the aluminum spar tube, or you can add a bolt and blind nut arrangement accessed through the gear bays. This is how our latest build is set up. It is also the plug in wing version.
Hope this helps. Feel free to follow up if I missed anything.
I will post pictures of the wing bolts, tail install, and rudder arrangement for added help.
_____________________________
Cheers,
Gary P. / use Steel Powder for ballast not lead. PM me for more information.
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RE: CARF F4U-1 Corsair build thread - 
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