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Old 04-28-2016, 06:52 PM   #11
Dutkoski
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Re: Hobby Topgun Mig-15


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Last task for the day, trial fit the fuse to the wing, trim all the plastic parts. Realized, I should have made a quick mould off the wing where the wheel wells are as part of the wing fillet was removed. Maybe I can cheat. Bit and do a rendering ahead of the wheel wells and make the skins fit. But that's tomorrow nights problem.

Was sorting through the parts and discovered it came with a light kit, hooked them up and they even work, neat.

Darn it's big ........
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Old 05-01-2016, 08:26 AM   #12
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Re: Hobby Topgun Mig-15

Yesterday, worked on the nose gear installation. Something simple turned out to be a head scratcher. The stock steering tiller arm just would not work, so, I fashioned my own pull pull tiller arm out of brass sheet and a wheel collar, silver soldered together. Used 25 pound test fishing line and a HiTec HS-81 as the steering servo. Everything works smoothly. The only issue is keeping the nose gear in the neutral position during retraction. I'm hoping the airstream acting on the trailing link nose gear will keep it straight.
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Old 05-01-2016, 08:27 AM   #13
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Re: Hobby Topgun Mig-15

Retracted position, the servo is on the centreline, directly under the strut.
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Old 05-01-2016, 08:40 AM   #14
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Re: Hobby Topgun Mig-15

I'm going to see if the JetFan 90 that I have with a Mega ACN 22/35/1.5ES will work. This is the same motor I use in the fiberglass Avro Arrow but with a Hoaye EDF unit on a 7 cell setup. Hoping the finer blades, even though there are more blades, will not cause a higher amp draw. I'll also be using a Castle Creation 100 Ice ESC and a separate receiver battery with a 5 amp BEC, but most likely will upgrade that to a 10 amp Castle Creation BEC, it Is somewhere in the workshop.

The JetFan 90 has a very nice carbon fibre shroud, but the silly little mounting tabs that are provided and not attached seem not up to the challenge. So, using 1/8" aircraft plywood, sandwiched with carbon fiber cloth top and bottom, made my own that go full length of the shroud.
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Old 05-01-2016, 03:22 PM   #15
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Re: Hobby Topgun Mig-15

Today's efforts got the model on its feet for the first time. But I think it sits a bit nose high, woukd like to loose about a 1/2" of height. It'll be tomorrow's challenge.
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Old 05-02-2016, 12:13 PM   #16
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Re: Hobby Topgun Mig-15

Tested the EDF setup today, pretty successful. The JetFan 90 sounded really nice and operated very smoothly. First tested with a new six cell 40-50C 4000 Turnigy battery. Performance was pretty fair, had amp draw of 62 and generated 1350 watts. Very manageable considering the model was designed around a six cell setup.

Then tried an extra cell, for a seven cell setup. Used an older pair of 40-50C 5000 Turnigy batteries. The amp draw was a lot lower with the JetFan over the Haoye fan, but the watt numbers were quite abit lower as well.

75 amps ----- 1850 watts

After a run of about 30 - 40 seconds, temperatures were, motor ---- 105F, ESC ---- 92F and batteries ---95F

I could most likely use an 8 cell setup, but that just puts more stress on the motor and batteries. The motor is rated for 85 amps continuous and I'm sure with the eighth cell, it'll be beyond that number.

If I need more power, I will swap out the JetFan and install a Hoaye EDF as on seven cells, it'll generate 2150 watts, but the amp draw is just above 80. This is the setup I use in the Avro Arrow.
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Old 05-04-2016, 01:07 PM   #17
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Re: Hobby Topgun Mig-15

Awesome very nice
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Old 05-04-2016, 08:49 PM   #18
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Re: Hobby Topgun Mig-15

Although this model was designed for 6s it was a commercial failure due to lack of performance and it's structural issues.
This plane will fly in a scale manner with about 1800watts but becomes fun around 2200watts and up. Don't skimp on power as you will just have to upgrade if you start too low.
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Old 05-05-2016, 09:00 AM   #19
Dutkoski
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Re: Hobby Topgun Mig-15

Sounds good Eric, guess Ill either try an eight cell setup or, swap out the JetFan EDF for a good old tried and true Hoaye unit. Fortunately, I still have a couple of dozen of them.

I also have a RC Lander unit they sold me a few years ago, it can grind out 3900 watts of power, but I think it will do this on a ten cell setup. I could test it out on eight cells and if it gives over the 2200 on this, I think it might be just the ticket.
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Old 05-06-2016, 09:53 AM   #20
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Re: Hobby Topgun Mig-15

Mine flew on the 6s setup, with about 2000 watts of power, but it was pretty lethargic. I would definitely recommend looking at an 8s setup. It will never be blazing fast, but the 8s would give it enough power to do some basic maneuvers and such.

It did sound really sweet in the air though, thanks to the perfectly balanced fan from Eric!
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