Recent content by Protech Racing

1. Calculation question: for a wide cockpit is it correct to consider the wingspan only the sum of the wings lenght?

I'm building a sea Flea .. 8 ft front wing with large kite shaped folding rear wing. Rear engine.
2. Calculation question: for a wide cockpit is it correct to consider the wingspan only the sum of the wings lenght?

For your situation and planform. You can model CG with scale models very well. The WIG CG will not be the same as at altitude for the same craft . Model it as a glider as accurate as you can and compare the results to the know good values and CG estimator equations. Some use 25-27 % of...
3. Gurney flaps + plain flaps?

AS aero adviser for Trans am cars. The Gurney was a huge tuning tool . Changing the size from 3/8 in to 1/2 in resulted in almost 100# down force change at 125MPH. I have never seen any data testing that showed that they did not work .
4. Calculation question: for a wide cockpit is it correct to consider the wingspan only the sum of the wings lenght?

If you want actual lift calcs , use 50% of the center area from 1 ft of either side of the fuse.
5. Staples for wing rib fabric attachment?

Do the math on the PSI at max lift and tug the glue/ fabric/ with a fish scale until failure. My glue test with staples, was over 10X the required PSI . So yeah , nobody wants the cloth to come off.
6. Staples for wing rib fabric attachment?

I stapled my Flea wings . Roughed up the 9/16 in staple and inserted it with gorilla glue . Paint over all glue !!. It lasted well over the 150 hrs I put on it and it sat out side . I also did a glue test over the course of a year . Worked fine . Will do the same again. I would not use...
7. Fold wings to 100in or drop and fold to 92in?

Right. I have a T tail drawn to swing the wings under. Well see how it plays out . My Dad is an old engineer with lots of modeling experience. ( he needs a mission) He's on the scale model now. He wants to see how the flying spoilerons will work, as do I. We have push tubes for them with...
8. Fold wings to 100in or drop and fold to 92in?

My container is barely 94 inside. I will double pivot the wings and stay under 93in .
9. Fold wings to 100in or drop and fold to 92in?

I'm still drawing my ultralight with folding wings, How important is it really to stay under 8ft wide? If I drop the wings and then fold the max width is the horizontal tail. If I simply swing the wings it is chord plus stuff to about 102in. Swing wing is fairly simple . Drop and swing...
10. American GEM - Youth Flight training System (from Lithuanian Youth Glider)

Please have your pilots wear helmets if you have a metal cage . A small crash with a head impact to a tube can kill pretty easily . I love this deal and is about what I did with my Son and father in my Tandem wing plane . They ran just enough throttle to puff it off of the runway.
11. Ultralight design with aluminum structure, no welding and folding wings?

I'm building exactly that . Folding wing , aluminum square tube fuse . The only weldments are the the motor mount and wing mounts to to attach to the alloy keel tube . I may do plans if Ilike it .
12. Wing rib to spar adhesive/epoxy

I use Loctite PL max premium . Check you tube for test , Its pretty good . Epoxy is always a good bet also .
13. Rubber Discs for Shock Strut

Sway bar bushings for cars and light trucks .
14. Double swivel hinge?

Thanks. This is basically a T tail affordaplane ish craft. I drew it up again last night . Looks like if I can get a T tail to work , I have room under the horizontal for the wings to drop and swing . I dont want the weight of a swivel block on the main spar. If I use the rear spar , i...
15. Double swivel hinge?

I'm designing around the wing swing . It should swing under the T tail and nest on the bottom of the rudder. I hope . Still drawing stuff but found some time .