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Found 2 results

  1. Reggie Perrin

    Elf on a diet...

    Just a very quick little build thread... I've wanted an Elf for a while and figured the winter period would be an ideal time to fettle one together whilst I couldn't fly. I've just finished the first of my Stream NXT's and needed a little light relief before tackling the second one. Best part of all, was it being an unstarted bargain from eBay... Following advice from a few internet threads and Boffin from here, I'd decided to modify the Elf right from the start, there are enough stories on the net about wobbly tails, pitch instability and broken fuselages to suggest that whilst the Elf is a very good model, it can be improved... I also wanted it to be as light as possible with a capability to add ballast if needed. Pictures at the bottom. First thing to do was remove the epoxy plug in the front of the fuz, this serves as a mounting for the RC gear as you will all know but it doesn't travel far enough along the boom to reinforce where the taper starts and the wall of the tube is compromised. With perseverance, removal can be accomplished and leaves the tube nice and clean for the replacement. A light but firm balsa dowel was tapered and sanded to fit, extending past the front wing mount. This was reinforced with carbon internally to provide some reinforcement local to where the taper starts. Bonded in with Zap, then cut and sanded back to follow the taper of the fuz. The balsa was lighter than the epoxy plug... To cure the wobbly tail and pitch instability, the tail was pylon mounted and the control surfaces actuated with kevlar pull threads and torsion springs. The vertical fin was stitched on around the carbon supports to reinforce the join to the fuz. I routed out some 1/32nd control horns to suit for the elevator. I thought about using tiny gear, 2gram digital servos and a tiny battery but didn't want to carry any nose weight and was concerned about the power of the tiny servos so followed advice and went for a fairly standard set up of 2 x SD100's and a 300mah single cell lipo. RX will be the Futaba 6004ff with an option for a 2 gram heavier RX if range is an issue and I need telemetry... Total weight, with CG bang on is 95 grams ready to fly Lots of thanks to Boffin for his enthusiasm and advice. Can't weight to give it a throw about now... Reg
  2. Guest

    Thermal or not?

    Hi guys, So i was out yesterday having a fly with my Elf and trying to set a good flight time for the challenge. Now the field i was flying from is very slightly sloped, is only slight but where we enter the field and usually stand to fly from is higher than the other end of the field. At the other end there are bushes/trees separating it from another field which are all level at that point. Yesterday while flying my Elf, it was a warm day with a nice breeze that kept picking up and dying, few big cumulus clouds about, i was flying upwind as we cannot fly downwind of where we stand, so the wind was straight on my face most of the time or slightly coming across from the lower end of the field. On one flight when the wind increased, i found a spot where the model was pushed to one side and when turning into it the nose pitched up so i started to circle and was getting some good height and would have got a good flight time out of it. But i didn't time it because i was unsure whether this could be lift from the sloping field? As still a newcomer to finding lift, i have never found lift upwind of myself as yet. The wind was directly on my face and the model directly in front of me and was going up pretty nicely, during turns i was able to hold in quite a bit of up elevator and the model would climb without stalling. In your opinion without seeing the field and being there, does this sound like genuine lift or lift off the field being sloped slightly? I was not able to climb as well again that spot for the rest of the session which makes me think it was really lift, also the higher the model was getting the stronger it seemed to be and i could turn less tightly, again leading me to believe genuine lift. I love the challenges on here and i'm a very honest person, i don't want to ever post a time, or even count it as a pb flight for myself if i haven't found a real thermal and the flight has been helped along by some other way. Mark
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