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Old Jan 03, 2013, 09:54 AM
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D_FAST's Avatar
Denver CO
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Large 90mm Tiger Shark Delta

The idea sprung up over the holiday's.

My brother had gotten one of the 90mm smart fans. He was thinking of selling it, but decided to see what we could get out of it on a light powered setup.

I cant remember exact numbers but i believe he was close to the 5 lb thrust on 6s. Think it was being spun on a 1600kv warhead??

The power system including lipo/esc/unit/etc... all weighs in at 2.5 lb.

So he asked me, think we can build a frame around 1.5 lb

We could try.


Build Progress is blazing fast on this one.

Idea sparked around X-mas 12/26/12
Cad completed just before the new year 12/30/12
Templates/foam cutting started on the New Year 1/1/13

And today we are ready for some glass work.

Air frame weight as of now. 11oz
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Old Jan 03, 2013, 10:18 AM
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white lake michigan
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Sweet, looks fast just sitting there. I like the wing cut into sections. I did my Chimera like that. It makes a nice strong wing. I have a extra Change Sun 4 blade sitting here doing nothing, One of these days I will build something around it. Hey what are those black things, look like you are using them for hatch hold downs?
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Old Jan 03, 2013, 10:28 AM
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They came from a crashed dynam turbo jet, you can also find them on dynams a-10.
They used for securing the nacelles, works a champ here too.
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Old Jan 03, 2013, 10:33 AM
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white lake michigan
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So D ... Is that a plane you have in a smaller size, that you outlined in sketchup and you enlarged?
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Old Jan 03, 2013, 10:41 AM
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No,

The smaller version in the background. is one that my Bro hand carved. Yes hand carved! no templates used what so ever.
He just looked at my old guai hanging on the wall, and sanded he arse off. that ship is about a yr old.
It had some issues of course, pile drove it into the ground a few times.
So ive started reconditioning it. And transplanting the power system i had in my 100+mph guai over to it.

I used the best picture i could find and re drew everything to get this 90mm version. Unfortunately the way i built the cad model, one can not scale it down or the wall thickness will turn into 1/32in thick.

I did my best to wrap the air frame around the unit as tight as i could to get the lightest possible airframe
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Old Jan 03, 2013, 10:47 AM
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white lake michigan
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Man your bro did a great job shaping it by hand. Are you guys planning on hand launch or small retracts? Should be in the air in a couple days at the speed your building
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Old Jan 03, 2013, 10:53 AM
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We havant decided yet. weight will determine if she get retracts. if we do place e-tracts on it. they will be short stubbies like the ones found on viper jets.
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Old Jan 03, 2013, 11:38 AM
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white lake michigan
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I think cereal box would work good too. As long as the amps are low and it does not burn your good to go. I think the matting for picture's is even thicker than the poster board I was using.
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Old Jan 03, 2013, 12:47 PM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
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Sweet, looks great.

Cheers,
Eric B.
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Old Jan 03, 2013, 01:35 PM
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Crystal River Fl.
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Looks great 'D!!! Hey that reminded me, I still have my old Gaui!!! Just need a HIGH C battery to run it.... Keep up the great work!! W
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Old Jan 03, 2013, 06:23 PM
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looks awesome. I love this method of making planes. so much faster and easier.
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Old Jan 03, 2013, 07:30 PM
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Philadelphia, PA
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How do you square up and cut your blank blocks out?
Some people like Claus square up all 6 sides to a block.

Are you using rubber cement to glue the sections?

I used this method with 2 inch thick blue foam and found that it is not the same thickness all the time. Typically thinner at the edges of a 4x8 ft sheet. Caused this problem (see pic) for me when i built the fuse in 2 halves.

I used cereal boxes which is similar to coke case or beer case boxes. Plenty thick for hot wire.



Nice work
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Old Jan 03, 2013, 08:27 PM
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Denver CO
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no foam is created equal. unless you are

1: cuting from square blanks that yourself have cut. Hotwire planer and know is true

or

2: cutting both sides in one piece. then the thickness doesnt come into play that much. you just got to keep checking,
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Old Jan 05, 2013, 08:32 AM
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Got a a few more hrs thrown at it last night


* Control surfaces cut
* balsa wood trim around appendages
* Appendages squared and mated to the fuselage
* Carbon Spar installed
* Filled

Now waiting for some glass and resin
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