Apple cheeks on a profile.

Any pitfalls I should avoid when putting apple cheeks on a profile model to cover engine and tank and dummies inboard.

Do they contribute much to stiffness if taken back to the wing?

Tony

LAST EDITED ON Feb-06-04 AT 07:47 PM (CDT)
 
Well, they will obviously enhance the strength of the nose, hide some of the uglies, but what do your rules in Merry Olde say about it? AMA rules prohibit outside cheek cowls on profiles.

Ty,

>>AMA rules prohibit outside cheek cowls on profiles.<<

Huh? Do you mean for P-40 or something? I built a Dick Mathis Coyote (and several other profiles) that have cheek cowls on both sides of the nose back to the wing.

LAST EDITED ON Feb-07-04 AT 01:48 AM (CDT)
 
Are there AMA rules for profiles? Is profile stunt an AMA event? I would wager no, and,no.

Cheek cowls and thick doublers are very advantagous to stiffening the profile model's weak and poor vibration damping effects. Doublers should go around the trailing edge and the cheeks to mid point on the airfoil. Al Rabe dispensed with the whole plank on it's side notion for the nose with the Mustunt, and for good reason. The intersection of the nose and wing root are what is called a stress riser, a 90% joint to hold a pulsing 1 cylinder engine and a gyroscopically precessing 10 or 11 inch prop is not sound.

Profiles are good for getting one to the field fast and putting up their first patterns. I then would say to one who wants to progress farther to build strong, light full fuselage models with properly boxed and triangulated structure. With the great full fuselage kits in abundance it should be easier than ever. The continuous debut of profile kits puzzles me.

Because of vibration effecting the fuel tank and engine it is very hard to get a profile to run with real reliability over a long period. I didn't use profiles long, but I do think they are useful. I see a lot of people in love affairs with them, with me they don't hold the same affection.

LAST EDITED ON Feb-07-04 AT 12:01 PM (CDT)
 
I was going by the AMA rule number 10;Profile definition in the control line section of the rule book. No mention of competition in the original question, so I made an assumption based on that. So sue me. No mention was made of stunt, carrier, semi- scale, etc. just how would it affect the profile models strength. Based on that I gave an answer. It's in the rule book, where I looked before making my limited answer.

Ty,

Sorry. Just the way stated made it sound like it was illegal in any application. I see what you're saying.

No competition just for sport flying!

LAST EDITED ON Feb-07-04 AT 01:06 PM (CDT)
 
Ty,
Never mind,
Chris...