Micro MIG 15 Mod -> Silent Seagull EDF - Page 4 - RC Groups
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Jun 08, 2012, 04:53 PM
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i dont think its minimal at all. dont forget it's the whole wing area that's moving..! bigger movements would only result in a stalling wing, with loss of lift and lost of drag as a result. I thinkt this will be just about right..
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Jun 10, 2012, 09:53 AM
Fear me, I'm a space-duck.
hanzie's Avatar
Sooooo, when is it gonna fly?
Jun 12, 2012, 02:25 AM
Registered User
back on track!
It seems like the hobbyglue coating isn't all that great after all. I assumed it was waterproof since it's an acryllic glue, but just to be sure i just tested it and apparently it becomes a bit sticky again when wet... :S
I was gonna paint it anyway but now i'll have to do it before it's first flight. will look better on tape...
Jun 13, 2012, 08:23 AM
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WELLLL ALMOST finnished..!

after two days and nights of frantic work, she's about ready to fly..!

I've painted and coated it with acryllic parquet laquer. it bonded really well with the glue and gave it a smooth shiny finnish, so it worked out fine after all. I did a very minimal paintjob, just painted the beak yellow, some black stripes on the wingtips and the eyes. I like to keep that "home-made" look she has..

I just need to make a few more minor improvements, but everything's working and she's ready to be testflown! I will do so first change I get..!

The whole thing can be taken apart and all components can be removed without any tools..:

and she fits in the original MIG's box..

I'm quite pleased with the result, and I suspect she will fly very nicely. Maybe a bit underpowered but.. well, no use to speculate. I'll just do it and make a video of the maiden...soon!
Last edited by Johannez; Jun 13, 2012 at 08:34 AM.
Jun 13, 2012, 11:04 AM
Do it Right, the first time!
CoolerByTheLake's Avatar
That is one sweet looking bird, pun intended! We have lots of gulls around here, right off the westen end of Lake Superior, and they tend to linger around the air. But give them a tail wind and they really move! Looks great and good luck on maiden.
Jun 13, 2012, 01:32 PM
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Janusz Jawien's Avatar
Fantastic job!
Good luck on maiden!
Jun 13, 2012, 03:45 PM
Fear me, I'm a space-duck.
hanzie's Avatar
What's the final weight? I measured my sabre to weigh about 105 grams. Yours has a much larger wing area so should be able to carry plenty of weight while still being able to fly. Maybe you could use some sort of spray-coating to prevent the glue from becoming sticky again?
Jun 14, 2012, 05:10 AM
Registered User
I measured her total final weight at 217 grams. that's a bit more than twice the weight of the MIG. BUT she has a way larger span than the MIG, 108 cm, and a wing area of 8,46 dm2, which gives her a wingloading of 25,6 gr/dm2... someone smart enough to roughly predict her flying speed..?
Jun 14, 2012, 12:33 PM
bwoollia's Avatar
Very cool mod! With that wing area it should fly nicely - find a slope and you could even do some soaring with it!
Latest blog entry: Crash Compilation
Jun 14, 2012, 12:34 PM
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vengeance111's Avatar
that'll fly fine
200g for a 1000mm span is great
Jun 15, 2012, 03:51 AM
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Originally Posted by bwoollia
Very cool mod! With that wing area it should fly nicely - find a slope and you could even do some soaring with it!
that's the idea..!
Jun 20, 2012, 01:48 PM
Registered User
I've been watching this build. You are really innovative in your approach. Thats what makes this hobby so great, when people like you step outside of the box.okThat is a great looking bird. I hope you take video of the test flight, would love to see it.
Jun 22, 2012, 09:00 AM
Registered User
Well... a video of the maiden -erh- 'flight'

seagull first flight (7 min 56 sec)

Seems like it needs some serious modifications. those down swept wings look nice but in combination wuth such a short tail they seem too unstable. I'll make them stand up a bit more, make a longer tail with inverted V, and give the wings stronger servo's and twist-spars, improve aerodynamics by taking out the 'bulge' on it's back by integrating the A3 flightcontroller with the hull, and move the CG a bit to the front while doing so... see if that works.
Jun 22, 2012, 01:04 PM
Fear me, I'm a space-duck.
hanzie's Avatar
Sorry to hear it didn't go too well.
Maybe you could move the cg further forward? As far as I can tell by the way it tumbles, it seems to be very tail-heavy. Someone at my club had a slope glider in the shape of a seagull, it also crashed because of a wrong cg. Also, the throws that come from its big tail may be a bit too much for a smooth glide.
Hope you can fix that wing.
Jun 22, 2012, 03:19 PM
bwoollia's Avatar
Nice explanation of an amazing project! I agree with hanzie, it looks tail heavy.
Latest blog entry: Crash Compilation

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