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  1. M

    Vortex generators

    I foregot to add that I also use them on my rudder. I have just a tad too small of a rudder and the VGs allow it to work . The improvement is small but worthy. BTW , MY Vgs are .5 in tall , 2in long, single surface, set at 15*, spaced 1 ft apart. Mine are at 24% but 26-29% appears to be...
  2. M

    Vortex generators

    I also looked at VG results. NASA is using them on rotor blades, in front of airlerons, near the 80% point on wings, etc. The only time the test results were less than stellar, is that the elevator also needs VGs to keep the authority balance. I have them on my UL and the slow speed came...
  3. M

    Kawasaki 440

    Fuel burn at 6k will be about 4 per hr. Fuel burn at 5k will be about 2.5 or 3 per hr.
  4. M

    using Captive Columns?

    RE ladders; I have ladders for spars in my UL. These are esp. useful for short span, low AR airplanes. The ladders do allow some twist and therfore airlerons are not used. The ladders wings are about 1.8 # per ft. using foam ribs. We load tested the ladders and the whole plane before...
  5. M

    Differential Ailerons

    For the UL , slow speed, I would start at the 3/1 ratio. Keep the inner, slower wing flying, avoid the UL stall and fall issues. Most UL cruise very near their stall speed. Try to avoid the stall at departure and final. Very little, or even no down, might work out OK. "The worse that could...
  6. M

    Changing tip design from droop tips to upswept tips.

    Turn the wings to the other side of the trailer, tips to the front ,facing in. MM
  7. M

    Urethane / Polyurethane Glue - (Formerly part of Boxy Structures Thread)

    Re: Boxy fuselage structures I did have some problems getting it to stick to the alluminum roof flashing that I wanted to use for a LE cover. Nothing stuck to it. i roughed it up and cleaned it and all that . Nothing would stick it, not even the epoxy. MM
  8. M

    Urethane / Polyurethane Glue - (Formerly part of Boxy Structures Thread)

    Re: Boxy fuselage structures Orion, Have you or anyone that you know,( in person) done any long term test on the poly glues?? Has anyone had a failure? I 've been using the glue for some time now, maybe 8yrs. never failed. We started using it to glue choroplast to foam for combat model...
  9. M

    Urethane / Polyurethane Glue - (Formerly part of Boxy Structures Thread)

    Re: Boxy fuselage structures The Elmers Ultimate glue is polyuethane. I think that the Gorilla is the same . This glue is stronger than epoxy when bonding foam to alluminum, or any thing else. I actually used it to cover my wings. It is 2 or 3 times stronger peel strenght than the...
  10. M

    Wing area questions and a few others

    I am pretty sure that the wing area for UL is about 140sq unflapped. At gross weight of 450# the loading is about 3# per sq. You may be designing to you own parameters if you want flaps to stall at 28mph and not exceed 63mph. 3# or under is going to be real close, IMHO. The real slow UL...
  11. M

    Urethane / Polyurethane Glue - (Formerly part of Boxy Structures Thread)

    Orion, try "elmers ultimate glue" for the bonding. It has won all of my glue test. I have used it to hold covering onto foam. It passes the peel test, better than the contact stuff. MM
  12. M

    Boxy fuselage structures

    Air does not like corners, but the box section is easy to glue together:> I am also, just now, drawing up the next two fuses. It is 2x2 alloy tube with the lower section all foam and glass. The tubes take the engine mount, wing mount, and the foam gets put in tension/twist. This flying boat...
  13. M

    Flying wing with pitch control canard?

    The canard is the most efficient form or pitch control. The canard controls pitch by lifting the nose, rather than pushing down the tail, increasing total lift. It does look a little funny and some old timers dont think it is right. "Birds have tails, not long noses" Ever seen a Goose...
  14. M

    Flying wing with pitch control canard?

    Loading. My front wing is about 3.5# per sq ft and the rear wing is about 2.8. The front wing has to be heavier than the rear wing surface, Any Rutan plane #s will be close. The gust control is fine . Do the research, as there is a lot of CG discussion, but most just talk without flying...
  15. M

    Flying wing with pitch control canard?

    The canard can and does work well , even at low speeds. if all of the wings are lifting, than the plane flies faster and climbs better. Look at the Onyx of Claude Piel. or google the CP 150. This looks like yours sounds and is very light. The tandem wing or canard flies very easy and safe...
  16. M

    Airfoil section comments on PS-1 airfoil on ProTech PT2C

    My plane , (and others) lowered the low stall/AOA speed with VGs . The most dramatic thing is the control at mush speed, very linear. Before VG, I could "break" the attached flow by "popping" the pitch control.Now you can use the pitch for brakes, as you get near the ground . This...
  17. M

    Airfoil section comments on PS-1 airfoil on ProTech PT2C

    I hope to hear about how well or not you like this plane . I am trying to buy one but have not sent any cash yet. I am looking for more info. I have designed and built an two axis UL, with assist frm others. The general consensous about a plane that continues to turn into the turn is...
  18. M

    Carburetor Vibration

    Just run the return line up and over the engine/ carb. This will give the carb priority. MM
  19. M

    Kawasaki 440

    440 B and C have longer port timing, like to rev higher than the early Type A. The Type A with a single carb and a muffler work the best for UL use, IMHO. They all will work, but the revs should be about 6600 or more, on climb with the B or C engines and near 65 or less with a A...
  20. M

    proven 440 setups?

    Kaw 440 works just fine. Try for a drive about 2.5 or os and a 58in prop.
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