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Maj. Woody's Skymaster 1/5 F-86

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Maj. Woody's Skymaster 1/5 F-86

Old 04-18-2018, 02:01 AM
  #51  
MaJ. Woody
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That is a good tip. I have a friend that did the same thing.

Does anyone have any pictures of the second cyclinders on the main gear doors and can you tell me which ones you bought?
Old 04-18-2018, 02:51 PM
  #52  
quist
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Originally Posted by MaJ. Woody
That is a good tip. I have a friend that did the same thing.

Does anyone have any pictures of the second cyclinders on the main gear doors and can you tell me which ones you bought?
i had an extra set of Skymaster cylinders from my hawk. I mounted on the rear edge of the door just a mirror image of the other cylinder.
Old 04-18-2018, 05:02 PM
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Dom, I don't know how your going to be able to wait until this winter to put your Sabre together....
Old 04-19-2018, 01:00 PM
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Received my F-86 Pilot today. Thank you Eric Clapp from A&E Jets for the fast shipping! This thing is amazing and the pictures through the plastic packaging dont do it justice. It looks very vintage and has some excellent antiquing. Sorry George!
Old 04-19-2018, 01:03 PM
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Old 04-19-2018, 01:20 PM
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Originally Posted by quist


i had an extra set of Skymaster cylinders from my hawk. I mounted on the rear edge of the door just a mirror image of the other cylinder.
Thanks for the reply. Are you saying that on the opposite door edge on the hinge line?
Old 04-19-2018, 06:25 PM
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Originally Posted by MaJ. Woody
Thanks for the reply. Are you saying that on the opposite door edge on the hinge line?
Yes, original is in the front of the door, I added a cylinder to the back edge of the door with the same geometry. I used the same F-86 pilot. I will take a pick when I pull it out of the trailer this weekend.
Old 04-20-2018, 07:13 AM
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That would be awesome. Thanks!
Old 08-07-2018, 07:52 AM
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Anyone flying one of these? Are you having trouble rotating the aircraft because of the way the plane sits on the gear? Any control surface issues like flutter when built according to the instructions?
thanks,
Old 08-07-2018, 08:08 AM
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One of my friends had aileron flutter with the internal linkages, he fixed it by making them external.

Sabres, can take a while to rotate, especially if overpowered. Try some reflex (up aileron mixed with up elevator).
Old 08-07-2018, 11:15 AM
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Originally Posted by MaJ. Woody
Anyone flying one of these? Are you having trouble rotating the aircraft because of the way the plane sits on the gear? Any control surface issues like flutter when built according to the instructions?
thanks,
Yes I have one. It flies great about 800 to 900 feet to take off but that is the nature of an F-86. Going to try a little less flap when I get to NY Dom.
Joe Lewis
Old 08-07-2018, 11:16 AM
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Dom just bring your camera to NY and you can take all the pics you want. Just remember, Don't over think it.

Joe
Old 08-07-2018, 07:39 PM
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8-900 foot takeoff roll, holy crap!
Old 08-08-2018, 04:33 AM
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I have been flying my Skymaster F 86 for about 18 months. 400' to rotate P 180 power using recommended flap setting for takeoff. Added oil to the nose strut to stiffen strut and improve angle of attack for take off run.
Model flys great...be sure to use the revised CG in the instruction manual on Skymaster web site. Added 1/8" crow to get some" wash out " on wings. Some guys are using 1/4" crow on BVM's F 86.

I love this model!!
Old 08-08-2018, 05:01 AM
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Originally Posted by two dogs
I have been flying my Skymaster F 86 for about 18 months. 400' to rotate P 180 power using recommended flap setting for takeoff. Added oil to the nose strut to stiffen strut and improve angle of attack for take off run.
Model flys great...be sure to use the revised CG in the instruction manual on Skymaster web site. Added 1/8" crow to get some" wash out " on wings. Some guys are using 1/4" crow on BVM's F 86.

I love this model!!
Two Dogs

I had one of these before and had it balanced at the 390mm. I was hesitant to balance the new one at the updated CG of 400 to 410mm. The new one I have flies great but I agree the take roll seems long. I balanced it at the 390mm. You say to use the updated CG. Where exactly did you put yours at. Are there any tail heavy issues in flight?

Thanks
Joe Lewis
Old 08-08-2018, 06:00 AM
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I used 405..........
Old 08-08-2018, 07:36 AM
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When I maidened my BVM big F-86, it took off in 50 ft and it is WAY overpowered with a K180. Reflex, reflex, reflex!
Old 08-08-2018, 10:48 AM
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could probably rotate sooner than 400'.......but I like a smooth rotation to flight, much more impressive How much crow or reflex do you have programed? I'm at 1/8" Thanks
Old 08-08-2018, 11:34 AM
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I am not using crow. Reflex is mixing up aileron with up elevator. I’m using 7 mm.


That was a pic I took when I was installing my new Jeti tx, so I took pics and measured all my throws so as to help me set up the Jeti. (Goodbye JR! You will be missed!)

Last edited by ravill; 08-08-2018 at 11:54 AM.
Old 08-08-2018, 02:30 PM
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MaJ. Woody
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Thanks for all the feedback guys. Keep it coming!

Any notes / pictures on how you are keeping the main gear doors closed in flight? I hear that is a problem.

Are you using the full bypass? I have the 180-200 pipe and full bypass and heard that it may not all fit.
Old 08-08-2018, 11:39 PM
  #71  
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Dom,

I am going to throw a spanner In the works and tell you why you hear all these fixes.

My F-86 rotates fine and with-in predictable distance. It has a JetCat 180Rx in it and it weighs empty, but including the drop tanks and full bypass with P-200 SM pipe, 48 lbs. The cg is at 380mm from LE. This cg was given to me by Mike O'Meara after he had two of these and flew them to many contest wins. He basically said to me - the cg is right at the back of the canopy frame moulding where it blends into the fuselage. Be prepared to add an obscene amout of weight to the nose - so you may as well plan for a nose orientated installation. The flying is completely predictable and I never use more than 15% expo on any of my controls.

The first problem with the F-86 is that the front tank is too big and carries too much fuel in front of the cg, I shortened both ends on mine up to where the cutaway is and still fly for 7 minutes. This tank modification also then allow for easy routing of wires etc. from the rear to the front of the jet.

The second and more serious problem is the negative AOA, especially at the wing tips when the jet sits on the ground. This gets even worse when it is fully fuelled and even worse when it is taking off. You have to extend (I had a new one machined) the inner tube of the nose oleo to the maximum length which will still allow the nose wheel to retract without jamming up against the rear edge of the nose gear door. In my case that was almost 1/2 inch. Unfortunately this will mean that the scale scissors arm will sit slightly higher than it should. However at about 100lbs of air pressure in the main oleos, the wing tips will now sit at zero AOA. When you fuel up and you are ready to taxi, push down on the main oleos and the wing tips will go to a positive AOA. Don't reduce the pressure in the main oleos.

As for flutter with internal linkages - they are absolute fine, provided you install them without slop and movement, always trying for the maximum leverage rather than simply the easiest install. Mine all work perfectly and I have no issues at all. I have to admit that the main gear doors are a PITA and even with the full bypass (which is a tight fit without major modification but definitely worth every bit of effort) they still hang down about 1/4inch during flight.

Good luck with your build - it is a wonderful jet, I love mine.

Cheers,

JanR

Last edited by Springbok Flyer; 08-08-2018 at 11:45 PM.
Old 08-09-2018, 02:13 AM
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MaJ. Woody
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Awesome feedback Jan. Thanks so much for taking the time to reply!!
Old 08-09-2018, 06:24 AM
  #73  
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Originally Posted by ravill
When I maidened my BVM big F-86, it took off in 50 ft and it is WAY overpowered with a K180. Reflex, reflex, reflex!
Wonder if my 63" BVM Sabre would benefit from a bit as well. It rotates in about 300', but it has dropped a wing on flare once or twice. Seems like it would be worth trying for sure.
Old 08-09-2018, 11:15 AM
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500' runway
Old 08-09-2018, 12:55 PM
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Originally Posted by two dogs
Two Dogs that was very nice. Much shorter role then mine. I did just finish re-balancing mine with the 405mm that you said you used. I will find out if it helps next week in N.Y. Do you use the Leading edge slats for landing. For my landings I have every thing out, Speed brakes Flaps and slats. Takes 3/4 throttle to keep her flying because of all the drag and she slows down so nice.
Joe Lewis
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