Originally posted by Phantom
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Official Freewing 80mm EDF F-86 Sabre Thread
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I flew 4 flights on my new F-86 today and what a nice flying jet. I ordered the PnP version with the 12 blade outrunner motor. First thing I did was swap in a 9 blade 1920kv inrunner system for better performance...and it proved to be fantastic.
Reading through this thread I was somewhat concerned about flying from a bumpy, grass strip. Turned out to be a non-problem. I did change the nose gear slightly....put in a larger wheel and a 3mm spacer to raise the nose and increase AoA for takeoff. The F-86 literally jumped off the ground in only a short distance and climbed out with authority. I was flying with a RT 4400 mah battery and performance was really good. Most of the flight was at 50% throttle or less and only going to full power for steep vertical climbs. From a high speed pass, pulling to vertical the plane continued to climb until I decided that it was probably going to go out of sight if I kept on. By the 4th flight I had increased the timer to 4:30 and was still landing with 40% left in the battery pack.
This one is a worthy addition to the fleet.
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On my last flight today I had an interesting occurrence. When it was time to land I dropped the gear and entered a downwind leg. I hit the flap switch and the plane immediately rolled hard to the left...past 90 degrees of bank. I immediately reversed the switch to the flaps "up" position and the plane recovered and landed OK. Turned out that the plastic clevis for the left flap had sheared off the cross pin so that the clevis was totally disconnected. Not sure why this happened but it could have been fatal.
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Originally posted by radfordc View PostOn my last flight today I had an interesting occurrence. When it was time to land I dropped the gear and entered a downwind leg. I hit the flap switch and the plane immediately rolled hard to the left...past 90 degrees of bank. I immediately reversed the switch to the flaps "up" position and the plane recovered and landed OK. Turned out that the plastic clevis for the left flap had sheared off the cross pin so that the clevis was totally disconnected. Not sure why this happened but it could have been fatal.
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I've always loved my Freewing F-86 with it's classic lines but it's performance in the original setup was a bit anemic. It sat in the hangar being flown rarely and I didn't want to spend the money but finally broke down and did the EDF/ESC upgrade. I wasn't sure it would be worth the additional cost for the upgrade parts but I'm now glad I did. It is a definite improvement and transforms the Sabre into an even more fun model yet still handles and lands like a trainer. Before, flying around with the drop tanks took a pretty high power setting but even with them on now it scoots along nicely with a lot less throttle. Clean configuration still isn't as zippy as an Avanti or T-33 but pretty close. If you have an old Sabre hanging in storage it makes it way better than the original Sabre.
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Originally posted by marwady View PostThis plane just looks like something I have to have!!
I love that it uses 6s batteries like a lot of my other airplanes.
So I ordered one 😁😁🍿
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I need some help.
On the 86 the elevators have one standard servo and one reversed. Mine do not center the same leaving the servo arms at different angles causing the elevators to have a different amount of total throw. They are about half a cog difference so moving one servo arm one cog does not fix the problem. I corrected the problem by plugging one servo into an auxiliary channel, mixing it with the elevator channel, and then adjusting throws to get an equal amount on each elevator. I would like to get back to the two servos on a y harness and using just the elevator channel so that I can add a stabilizer. Any ideas?
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^ I have a huge collection of used servos from old, dead planes. I’d use a servo tester and test all the servos I have that are the same brand and type until I found 2 that center exactly the same. Put those two into the plane and use a servo reverser on one of them. If you don’t have used servos laying around, you could go to the hobby shop and buy a couple of servos after you test them for center. Again, if you can’t find a reversed servo, get a servo reverser.
PS, in reality, a gyro acting on a servo will rarely (if ever) approach full travel when stabilizing that servo (or set of servos), so it’s not so important if the max throw is a little off for that purpose. If the difference in max throw doesn’t cause the plane to roll during a tight loop, again, it’s not enough to worry about.
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Originally posted by Laserdude View PostI need some help.
On the 86 the elevators have one standard servo and one reversed. Mine do not center the same leaving the servo arms at different angles causing the elevators to have a different amount of total throw. They are about half a cog difference so moving one servo arm one cog does not fix the problem. I corrected the problem by plugging one servo into an auxiliary channel, mixing it with the elevator channel, and then adjusting throws to get an equal amount on each elevator. I would like to get back to the two servos on a y harness and using just the elevator channel so that I can add a stabilizer. Any ideas?
Thanks
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Originally posted by Laserdude View PostI need some help.
On the 86 the elevators have one standard servo and one reversed. Mine do not center the same leaving the servo arms at different angles causing the elevators to have a different amount of total throw. They are about half a cog difference so moving one servo arm one cog does not fix the problem. I corrected the problem by plugging one servo into an auxiliary channel, mixing it with the elevator channel, and then adjusting throws to get an equal amount on each elevator. I would like to get back to the two servos on a y harness and using just the elevator channel so that I can add a stabilizer. Any ideas?
Thanks
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I've been flying well over 50 years and while I have heard of this I've never seen one. Any idea of brand and model servo?
Also used to be on some, I used Futaba mostly, there were little screws holding the pot in the case and you could loosen the screws rotate the pot and then tighten it back down. Now they are friction fit, you may be able to do something similar but really most planes aren't effected by a little more throw to one side.
Many digitals are programable for end point, centering and direction (a lot of the Hitec are)...
Originally posted by radfordc View Post
Back in the day it was possible to adjust servo centering by inserting a tiny screwdriver through the hole in the output shaft and adjusting the pot. The pot had a screw slot just for this. I don't know if today's servos allow this or not?
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I am going to be flying of a rough grass field. I am a bit concerned about the landing gear being on the weak side. Is it possible to reinforce it so grass ops are not an issue?
I know it might be sacrilege, but has anybody converted this to trailing link gear? I have an Avios jet with such a gear and grass has not been an issue with the stock gear.
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There are nose gear braces for the F86 available to buy or to print. My Sabre, future Fury, shows up tomorrow and I already have the brace. I'll post a photo when I install it.
I'm planning on flying it from grass. I'm considering belly landing it if the grass is too long to cleanly land it without damaging gear. But I don't want to shred the belly either.
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