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Yorkman

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  1. Posted by Trevor Crook on 12/11/2020 19:07:32: Indeed. The problem with mounting the retract unit deep in the nacelle to accommodate the wheel is that it makes the leg longer, which makes it more prone to bend, and puts more stress on the retract unit. exactly. it's a double whammy of stresses acting in line with the direction of movement and the added leverage due to needing to bury the diameter of the wheel rather than the thickness of it.
  2. That's a shame! The York has now been flying for 16 years (off and on!) and I hope many more years to come. I have decided that I will try and engineer some 'proper' undercarriages for this new project, with functioning drag braces, as per the York, but with a much simpler actuating and adjusting system. I really don't like just relying on the strength of the retract unit to hold the wheels against the landing forces. It works ok on my Mossie, but that's a proper lightweight. https://www.youtube.com/watch?v=dVdAE2CE2K8&ab_channel=MartinAbbott
  3. Posted by Martin Harris on 09/11/2020 21:16:46: Do they retract backwards? yep
  4. As to which aircraft, it's a secret, as I can't see any others out there and hope it may be a first!
  5. Posted by Robert Parker on 09/11/2020 18:30:25: Hi E flite makes a 100-degree unit part no EFLG320 for 25-46 size engines, they also do 105 degrees and 95 degrees. I cannot see a 60 size in their range (Horizon Hobbies) Hope this is of some help, any clue as to the model your designing?? Regards Robert what does '25-46 size engines' mean? It is no help whatsoever! For a start it's a multi-engine model, and it will be electric! Why do they not say the maximum weight of the model (as some others do)
  6. I will need, if possible, a pair of 100 degree electric retracts, for a 6' span four engined transport which is in the design stage. 90 degree rotation not required! Not a clue as to what the projected weight is, but the lumpier the units the better. Are there any out there that could do this job? Cheers all.
  7. I can't find anywhere to adjust anything. Go to 'flight mode setup' in the menu, and it allows me to assign a switch, which I am then told, loudly, is 'flight mode 1' or 'flight mode 2'. And...? How do I now make that switch adjust anything?
  8. I've set up flight modes on a powered sailplane on my DX7, can't remember how, but got launch, cruise, thermal and landing moving the ailerons and flaps. Now I want to set up a 'launch' mode for a powered model, which drops the flaps to take-off position and dials in some up-elevator so (hopefully) it climbs away from the hand launch and I flick a switch and the elevator returns to neutral and the flaps retract. But how? I don't want the up elevator on normal flap extension...
  9. I think you need a pre-takeoff checklist Simon-just read your sea vixen build thread where you also launched with gyro off....or just have the gyro permanently switched on! I'd like to know how you manage to get a decent finish with Depron and Uhu Por. I've built a couple of Mosquitos with fuselage construction similar to yours though fewer planks and thicker depron- and as you have said, the depron sands but the glue doesn't...so I could never get the joints to disappear...
  10. Just fried the Hobbywing Pentium 60A opto that came fitted in the Lander Panther. It had been cutting out, pausing, and simply not working at all, at different times, before smoke issued forth. When it had worked max amp draw was measured at 53, so it should have been ok. Anyway, it needs replacing, so just wondered what people recommend? Just a quick google of '80amp esc' produces a list varying in price from £16 to over £100 (which I'm not going to pay)....
  11. Posted by bert baker on 21/01/2020 17:17:41: As I understand retracts, there not designed to hold the oleo and wheel up on the screw jack or to hold it down when deployed. they are mechanically locked up and down Indeed they are. I've just had a look inside a spare one I have, and sure enough it has tiny microswitches at each end of the screwjack travel. It would be possible to introduce something in there to activate the microswitch early and thus stop the movement but it would be very fiddly to do. I will carry on with them moving through 90 degrees. So, to answer my own question-yes, it's possible, but not very do-able
  12. I wonder how easy it is to adjust the limit switches? I want to reduce the 'up' travel....
  13. apologies for spelling of 'electric' in the title...
  14. is it possible to reduce the throw of the generally available now servoless retracts? Edited By Yorkman on 21/01/2020 10:28:04
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