RCU Forums - View Single Post - MY KADET LT-40 BUILD
View Single Post
Old 10-21-2005 | 05:02 PM
  #44  
Balsa Master's Avatar
Balsa Master
Senior Member
 
Joined: Oct 2003
Posts: 999
Likes: 0
Received 0 Likes on 0 Posts
From: _,
Default RE: MY KADET LT-40 BUILD

you may possibly be the most patient person ive ever seen.... my god i wish i could get myself to use a right angle and clamps.... (also... only thing i can see that could be improved... use the pins with the little round ball on top... you hurt your finger less on hard balsa :-D) i would also not recomend using CA at any point that will be under heavy load (wing joint) use thinned epoxy (denatured alcohol or 99.9% isoprophle will thin epoxy with almoast no strength loss 70% rubbing alcohol will work but slightly diminish the strength) to secure the dihedral braces and wing halves together... (also use thinned epoxy to apply the fiberglass cloth over the top of the sheeted wing... CA just doesent cut it in my book, maybe ive been building highpower rockets too long... but i like my planes to be strong)

I trial fit the braces into the wing panels to test for fit and it all looks real good. I was able to slide the braces out of the right wing panel OK with only one cracked rib but now one of the braces I can not slide out of the left wing panel without breaking ribs. The braces are very tight fitting so it would be very hard to epoxy the braces first and then slide them in, so how bout the plan above, that would be just as strong wouldn't it? Maybe even stronger because along with the thin CA wicked in you have the epoxy reinforcing the whole thing.
sand the braces

CA's sheer strength is significantly lower than thinned 30 min epoxy.... even poorly mixed epoxy is way stronger... (sheer strength is the amount of force needed to slide 2 peices of wood that have been glued together past 1 and other) because the wings have a dihedral that angles them upwards you create lateral forces that try to pull the 2 wing halfes apart.. though those forces are low in flight... once you advance to basic arobatics and try some rolls... you may lose half a wing [X(]

ultimatly on a semi, over wing trainer with large surfaces if the thrust istn 100% you can trim it out... (the down and right thrust should be built into the fuse if i remember my .25 correctly)

wow your making me wann go buy a 40...

oh... also when your done with the wing... if theres a little warp in it (from a croked table or warped wood) when you cover it u can shrink the wing back into shape :-D
also if the spars are warped (this is in the instructions im sure but ill say it ne way since i for 1 read right over those big grey note boxes) have the top spar warp down and the bottom spar warp up to balance out to no or little warp. never install 2 warped spars in the same direction (unless you like that whole gull wing thing[:-]