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Old May 03, 2012, 04:01 PM
Registered User
Amsterdam
Joined Sep 2005
143 Posts
Build Log
Micro MIG 15 Mod -> Silent Seagull EDF

hello boys n girls!

Sometimes I make a seagull.
first one was the Ping Wing;
X-Twin Mod: The PING WING - RC Groups

and then last year this one;
quick 'n dirty SEAGULL build - RC Groups

and now im building it again, but bigger. and better. and without props...

So i took a HK MIG 35 mm EDF

Mig 15 35mm EDF Micro Jet EPO

stripped of wings, paint and features,

bought a spare 1 meter-span Graupner Terry Wing
Graupner Wing

and I will cut it into the wings of a seagull, and put them together like this..:


..well, and then make it look like a seagull, ofcourse.













baby bath does the job for making the right bend..:



a bag of boiling water fixates the shape...



again on the other side..perfect!





So after 0 (zero) flights i cut up the MIG, and plan to rebuild it like this:



-Fuselage will be upside-down, for a lower centre of gravity

-EDF's make a terrible noise, seagulls don't, so I want to dampen the sound of the fan.

-exhaust will be rotating for rudder control

-aileron servo's will twist the wing tips

HOW exactly is something I'm figuring out as i go...we'll see!

I cut the fuselage in half. In the middle you can see where the EDF was placed in the fuselage. directly attached to it the whole thing worked like an 'amplifier' for the sound of the fan... So I wanted to make a sound dampening suspension for the EDF. luckily with that fat part in the middle cut away there was enough space inside..


two rings on the right side will be attachment points for the suspension.


made a prolonged duct from PET bottles.


..lots of space!

..I suspended the EDF inside a legging, which i attached to the rings.
The inside of the fuselage I covered with isolating cloth.


..freely suspened inside the fuselage..!




Test Video:
silent EDF set-up test (1 min 51 sec)


T.B.C... !
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Last edited by Johannez; May 08, 2012 at 09:16 AM.
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Old May 03, 2012, 04:28 PM
Fear me, I'm a space-duck.
hanzie's Avatar
Nederland, GE, Wageningen
Joined Nov 2011
288 Posts
Looool!! That's a genious idea!
And ofcourse it's another Dutchie! What's going on with Dutchies and seaguls?
For some reasons the guys at my club also like to build seaguls, but those are usually for slope flying. Now I just HAVE to build a duck someday...
Good luck with this one!
Hanzie

EDIT:
BTW, does that 'silent ducting' system still produce the same amount of thrust?
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Old May 03, 2012, 05:50 PM
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Jacques.Eloff's Avatar
United Kingdom, England, Cobham
Joined Oct 2007
549 Posts
Johannez - that is genius and I like your use of everyday items - including a child's drinking cup

By the way, I have an AEO 35mm unit (special 6,000KV) that is much quieter than the SkyAngel unit - would be ideal for your gull.

Jacques
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Old May 04, 2012, 01:51 AM
Registered User
Amsterdam
Joined Sep 2005
143 Posts
@hanzie:

I don't know, I never measured it.. but the duct is open and at about the diameter of the fan all the way though, (where as the original MIG fuselage had two 'expension chambers' inside) and it pruduces a good steady airflow.. i guess it should be OK. the whole thing is a bit heavier ofcourse, but I bet the wings i have in mind will carry that extra weight without problems..

@Jacques

Thanks! I'm definately interested in more silent fans! I don't know much about them and i dont know what it all means, (this is my first EDF project) but what I found on AEO units didn't sound very optimistic..:
http://www.rcgroups.com/forums/showthread.php?t=1398463
any comments..?

EDIT PS: and about the cuttig up of a baby's cup; I live in Amsterdam, and there's no RC hobbystore for miles around.. I have to use whatever i can find nearby. so I bought that one especially for its material and diameter.. -just like the legging, btw- just so you don't think I let my planes come before my baby..
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Last edited by Johannez; May 04, 2012 at 03:18 AM.
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Old May 04, 2012, 05:51 AM
TheyreComingToTakeMeAway!
derk's Avatar
USA, ID, Coeur D'Alene
Joined Dec 2003
5,469 Posts
very nice, you can really hear the difference in the 2 setups. also, nice wing construction, i had not thought to cut a wing from an existing one.
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Old May 04, 2012, 02:36 PM
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indoor_fr's Avatar
Paris (France)
Joined Jan 2006
851 Posts
Hi,

Very nice work on both wing and the edf!
Can't wait to see your bird flying!.
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Last edited by indoor_fr; May 04, 2012 at 02:42 PM.
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Old May 04, 2012, 02:56 PM
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Joe 1320's Avatar
United States, FL, Sebring
Joined Feb 2006
7,455 Posts
Pretty cool. Are you going to use the stock canopy?
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Old May 04, 2012, 09:43 PM
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4stripes's Avatar
Canada, ON, Burlington
Joined Jan 2009
3,004 Posts
Great project!
Modelers that "think outside of the box" move this hobby forward.
I'm sure the composite crowd will have something to say about a foamy in "their section".
Keep up the good work,
Cheers Eric
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Old May 05, 2012, 04:49 AM
EDF Jet Jam May 2014
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
6,579 Posts
Very cool! I have a Dutch friend in Helmond that likes to do stuff like this. Maybe you know him JePe
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Old May 05, 2012, 11:06 AM
Registered User
Amsterdam
Joined Sep 2005
143 Posts
Quote:
Originally Posted by Joe 1320 View Post
Pretty cool. Are you going to use the stock canopy?
...have you ever seen a gull using a canopy..?

What gulls DO use however, is Fly By Wire. they constantly make minute adjustments because they really feel every breath of air which passes their wings..
So when I saw this 3 axis Gyro Flight Controller,

..I thought why not..? for 30 bucks I can make my bird fly by wire too! (and I can always turn it off)

meanwhile, I've been pondering on how to fix that rotating tail.
again a plactic PET bottle came to the rescue, combined with a teflon-tape holder and a coctail stamper...:









..hope it will work..!
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Old May 05, 2012, 09:33 PM
"Take Off" eh!
vettster's Avatar
Canada, ON, Beeton
Joined Aug 2008
3,166 Posts
Brilliant Work!!
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Old May 07, 2012, 07:35 PM
Registered User
Amsterdam
Joined Sep 2005
143 Posts
Well, I've spend countless nightly hours trying to get the damn tail mechanism to work, or rather, to be easily workable by a servo... the pusch-rod had to be very small yet very strong, very felxible (going in a curve) yet precise, and durable yet moving real easily... everything i tried seemed to jam the mechanism and/or break. after many failed attempts and reaching near insanity, a hard plastic party drinking straw married a tiny tie-wrap, and they brought salvation!


now lets hope the .5 kg torque of HK's 3,7 gram servo's will be up to the task..!

I temporarely put some parts together..She's starting to look like a bird!

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Old May 09, 2012, 05:50 AM
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Amsterdam
Joined Sep 2005
143 Posts
I'm coating the whole thing in "HEMA knutsellijm" (= cheap-ass hobbyglue), works really nice!
Its deludable in water, so i can just paint on a thin layer, and when it dries (takes a while) it leaves a completely invisible, waterproof skin. its strong but still flexible, and it allows the surface to be sanded REALLY smoothly..! Also it doesn't have that yellowish look to it, like woodglue or even uhu-por tends to have after some time.. I coated the servo compartments inside the wing extra thick, and there it shows an almost green/blue pearly quality.. and after sanding.. it just feels smooth as silk..!

these are things I can not show you on internet pictures, but I'm lovin it!



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Old May 09, 2012, 10:48 AM
Low rates are for wimps
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United States, CO, Colorado Springs
Joined May 2008
3,402 Posts
Very interesting project!
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Old May 09, 2012, 11:25 AM
Registered User
Amsterdam
Joined Sep 2005
143 Posts
coated all the parts with hobbyglue, they're almost done..! ready to start building in the elctronics. just waiting for that A3 Gyro flight controller and those damn servo wires ...


and to think this used to be a MIG 15...

She's starting to look like she wants to fly..!
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