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  1. Steve_B

    To Vortex Generate, or Not?

    My bet would be that the wing is fully stalled in a full high alpha harrier, except possibly for a few inches near the root that in the prop wash. You would need to use really flexible 'tufts'. Wool (what they often use in full size planes) is probably too stiff, strips of tissue or crepe paper...
  2. Steve_B

    To Vortex Generate, or Not?

    Not sure about 'shooting down' the math looks pretty solid.. Only caveat is that the prop wash only covers a small proportion of the wing, also in high alpha you would have only moderate throttle so probably much lower prop wash velocity. Tufting would indicate just how big the wash effect was.
  3. Steve_B

    To Vortex Generate, or Not?

    'tufting' is something i've seen done on RC planes before but not 3D planes and not with VG's.. it's an excellent idea and wouldn't be much work to do.
  4. Steve_B

    To Vortex Generate, or Not?

    Dead right, that's where VG's are usually located and for exactly this reason. The previous point you made was also spot on. VG's delay separation of the boundary layer and so delay stall, that is their only purpose. We would have to ask if is this really what we want to achieve if we are...
  5. Steve_B

    Knife Edge tips.

    I discovered just that on the weekend. Doing KE loops with my 51" AJ Slick and discovered it has a wicked snap out of KE if you use too much rudder. The 48" Edge and Laser EXP's on the other hand are totally predictable in KE, possibly the SFG's at play? I might reduce rudder throw a bit on the...
  6. Steve_B

    EF 48" Laser EXP

    Surprisingly my records say i pulled higher watts by quite a margin. here's the numbers i have noted: With the 13x7 Xoar: 8910 RPM 64A 983W 15.35V 3.5Kg thrust What may be influencing this is that this was a while ago recorded with nice new Gens Ace batteries which held very high load voltage...
  7. Steve_B

    EF 48" Laser EXP

    Yep, you cant have it all ways.. If you make the wing totally tip stall proof (generally by using a low taper ratio) then it wont do snap manoeuvres. If you taper the wing more sharply then it will do great snaps but it will also snap when you don't want it to. I think the Laser has the...
  8. Steve_B

    EF 48" Laser EXP

    I think you will find it's rock solid one you get chance to fly it on a calmer day. The transition into harrier is a little trickier than, say, the EF Edge, but you just need to be on your toes to catch it if it drops a wing a bit. Once in the harrier it's as stable as anything I've flown.
  9. Steve_B

    EF 48" Laser EXP

    Curse my fat fingers:o
  10. Steve_B

    EF 48" Laser EXP

    I've not tried the Laser on a 14" prop but I fly the Edge on that prop regularly (from a grass strip), and it uses the same L/G, and it's not a problem. If you did have issues then a Xoar 13x7 works fine on your motor. Hope the wing drops for you soon. It's the same here, windy most of the...
  11. Steve_B

    3DHobbyShop 51" AJ Slick

    Losi, thanks, if it's stood up to all you can throw at it then I'm sure it's fine. I'll stop worrying.
  12. Steve_B

    3DHobbyShop 51" AJ Slick

    Thanks Losi.. i had to take a couple of mm off the length on my tube too, which does point toward maybe a new tube supplier being used?
  13. Steve_B

    3DHobbyShop 51" AJ Slick

    ok.. more information on the possible issue. i pulled the wing tubes from some of my models. The Aj Slick one felt much lighter than the ones from my 48" EF EXP's or from my 51" hobbyking Slick. it also felt noticably easier to bend, especially compared to the EF tube which was very rigid...
  14. Steve_B

    3DHobbyShop 51" AJ Slick

    Bendy wings? I've just put together my new Slick, elsewhere someone brought up that they thought the wings on their new Slick were quite bendy, deflecting noticeably when you pick the plane up by the tips. I'd also noticed this, the wings are much more flexible than my 48" EF models. In fact...
  15. Steve_B

    EF 48" Laser EXP

    I didn't use the spacers, the cowl fits fine, yes there is a quite large overlap but it's not a problem. The laser tends to be a little nose heavy so adding spacers and moving the motor further forward will make that a bit worse. Only thing to watch with the cowl overlap is to give the inside of...
  16. Steve_B

    EF 48" Laser EXP

    Actually, so did i. i overlooked that in my previous reply:o.. But it is only a fraction longer than the stock arm.
  17. Steve_B

    EF 48" Laser EXP

    Garry, I do remember your bad luck with your Savox servos. All i can say is I've got them all round on three 48-51" planes over hundreds of flights and they have yet to cause me any problem, so I'm happy with them. I'd not recommend using anything longer than the long arm that comes with the...
  18. Steve_B

    EF 48" Laser EXP

    Savox SH-0255 on the elevator of my Laser, no shortage of torque and pretty fast too, plus they fit the hole.
  19. Steve_B

    Extreme Flight Owners Thread

    Sounds good!.. Quite similar to the spec I'm using. I'll be interested to hear how the motor copes with the Xoar. I tried a Xoar 14x7 on my DM2820-750 but it pulled too many amps (70+). I went to a 14x7 APC which was awesome, but eventually it damaged the motor due to the heavy prop weight and...
  20. Steve_B

    Extreme Flight Owners Thread

    PS.. NJ, heres a little build tip on the Laser.... The cowl is quite long and overhangs behind the firewall former by a fair bit. The canopy 'slot-in' under the overhang, this is no problem in principal but the inside of the cowl is quite rough glass fibre and it very quickly scratches the...
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