Chewy, for the 42" BB Park, use wing struts. The foam will fold up without them.

Tony

Never ceases to amaze me how most trainers offered by the larger manfacturers are terrible Toys or products of a byegone age, in comparison to the efforts of the guys on this forum. It can't be money, most of the planes here would be pretty cheap to make as a Kit.

Ok, Tony. I will put in a couple of cf wing struts. DO I still need a cf spar with the struts?

If I install 2 aileron servos, I guess I will have to program in a lot of differential, right? Also, might as well program in the flaperons while I am at it. Yeah, I know it's probably wasted effort for this plane, but will the flapperons cause tip stalls?

chewy

Originally Posted by dekan

Never ceases to amaze me how most trainers offered by the larger manfacturers are terrible Toys or products of a byegone age, in comparison to the efforts of the guys on this forum. It can't be money, most of the planes here would be pretty cheap to make as a Kit.

Indeed. It has to be about money, replacement kits and parts etc. The BB airframe costs about two bucks to make, maybe less, and is a better primary trainer than anything I've seen the kit manufacturer's offer. That said, GWS does have a few really good trainers like the Slow Stick and J3.

Tony

Originally Posted by chewytm

Ok, Tony. I will put in a couple of cf wing struts. DO I still need a cf spar with the struts?

If I install 2 aileron servos, I guess I will have to program in a lot of differential, right? Also, might as well program in the flaperons while I am at it. Yeah, I know it's probably wasted effort for this plane, but will the flapperons cause tip stalls?

chewy

Chewy, you don't need a spar with the wing struts. As I said before, ailerons require a very large differential to work on an undercambered wing, at least in my experience.

Flaperons are fun to play with and will cause this plane to go from really slow to really, really slow. They shouldn't cause you tip stalls if the flaperon chord is smaller at the tip than at the root. That way, lowering your flaperons increases your effective washout. It doesn't have to be a lot smaller, a 1/4 to 1/2" should do it.

If you find the adverse yaw to much to bear, simply add a bottom panel to the wing. Don't sweat, with the flaperons it will still slow the plane down to a crawl but it will roll way nicer. BTW, a little bit (1/4") of negative flaperon will really increase your cruise speed and penetration.

Tony

Originally Posted by dekan

Never ceases to amaze me how most trainers offered by the larger manfacturers are terrible Toys or products of a byegone age, in comparison to the efforts of the guys on this forum. It can't be money, most of the planes here would be pretty cheap to make as a Kit.

Good reason to build a plane for a noobie. Maybe even a Blu-Baby!

kdahlhaus, Have you maidened that new 42" BB yet? Looking forward to your flight report!

Originally Posted by Tony65x55

If you find the adverse yaw to much to bear, simply add a bottom panel to the wing. Don't sweat, with the flaperons it will still slow the plane down to a crawl but it will roll way nicer. BTW, a little bit (1/4") of negative flaperon will really increase your cruise speed and penetration.

Tony

By "add a bottom panel" do you mean make the airfoil a flat bottomed section? If not, then what does that mean?

Again, thanks for the info.

chewy

Originally Posted by FirstShirt

kdahlhaus, Have you maidened that new 42" BB yet? Looking forward to your flight report!

Nope, not yet. Need to mount the electronics / pushrods / engine and reinforce the wing and it should be ready to go.

Originally Posted by chewytm

By "add a bottom panel" do you mean make the airfoil a flat bottomed section? If not, then what does that mean?

Again, thanks for the info.

chewy

Yup, that's exactly what I mean.

Tony

Guys,

How do you align the pushrod with the servos, elevator, and holes in the bulkhead and fuselage? I tried poking a hole from the elevator going forward. It kind of worked, although the pushrod has a bend in it. I've dealt only with profile planes before, and of course it's pretty easy on those!

Originally Posted by kdahlhaus

Guys,

How do you align the pushrod with the servos, elevator, and holes in the bulkhead and fuselage? I tried poking a hole from the elevator going forward. It kind of worked, although the pushrod has a bend in it. I've dealt only with profile planes before, and of course it's pretty easy on those!

Kdahhaus.... Looking from above or below the fuse I take a straight edge and determine the straightest line from the outmost hole in the servo arm to the point closest to the centerline of the model usually about 3/4 in. On a narrow fuselage I run the line from the right side servo to the left side control horn of the rudder or elevator. On the horizontal plane I simply lay the servos on the plan and draw a straight line from the servo horn (based on where I'm positioning the servo) to the control horn on the elevator or rudder. Hope this makes some sense... Bob

Thanks Bob. That makes perfect sense. I should have make the arrangements before assembling. Next time!

Originally Posted by kdahlhaus

Thanks Bob. That makes perfect sense. I should have make the arrangements before assembling. Next time!

No problem.... The path doesn't have to be perfectly straight so long as the rod slides easily. Bob

Progress so far...

Wing halves and KFm strips joined at the dihedral angle (hotwired angles)
KFm strips grooved for spars (soldering iron).
Front and rear carbon spars and 5/32 alum joiners mated.
Mono block parts mated to glued to fuse halves.
Fuse taped together for pic.

Ready to plop in the spars and glue the KFm strips to the wings!
Still gotta work out servo and reciever mounting and widen stab slot before gluing fuse sides together. Looking forward to the test flights!!

Scott