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 Post subject: Video Up !! More quad Madness version 3... The "Ninja"
PostPosted: Sat Jul 12, 2014 12:25 pm 
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Joined: Mon Jan 21, 2013 8:26 am
Posts: 72
Location: Prince Albert, Saskatchewan, Canada
Hey all. Just thought I should get some "expert" opinion on my latest quad design. I love the original madness vtail I designed but a friend suggested a different building material. It's a foamed PVC sheet called Sintra. I proceeded to build a quad out of Sintra based on the original platform. The version one quad bare frame was 300grams. Despite all efforts to lighten it the version 2 quad weighed in at over 400g. Back to the design board and the new version 3 is a 240g lightweight. Still a 30 deg v on the tail but the booms are raised to get the rear props out of the grass to allow for shorter gear.

Here is my issue. Not sure about the "look". I have been looking at it too long and it's growing on me but my first impression was that of a skydiving frog. Please chime in with your honest opinions. You won't hurt my feelings. I will still build it and see how it flies and looks in the air.

Just mocked up for a few pics. The frame is bottom routed so all esc's and wiring is hidden. The board will be under a molded canopy is all that will be showing is the battery slung between the gear.

I value your opinion. ThanksImageImageImageImageImageImage


Last edited by Cat1 on Sun Aug 17, 2014 9:15 pm, edited 2 times in total.

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 Post subject: Re: More quad "madness" . Ver 3.0. Need input
PostPosted: Sat Jul 12, 2014 1:52 pm 
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Joined: Mon May 27, 2013 1:59 am
Posts: 28
I was thinking cool design until you mentioned the sky diving frog. Now I can't get that image out of my mind.
Looks like an interesting material. How stiff is it?


Last edited by gowen on Sat Jul 12, 2014 2:34 pm, edited 2 times in total.

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 Post subject: Re: More quad
PostPosted: Sat Jul 12, 2014 2:25 pm 
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Joined: Mon Jul 25, 2011 11:58 am
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Location: Austin, TX
I think it's cool! Nothing wrong with a skydiving frog. :lol:

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 Post subject: Re: More quad "madness" . Ver 3.0. Need input
PostPosted: Sat Jul 12, 2014 8:19 pm 
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Joined: Thu Aug 11, 2011 12:46 pm
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Location: McKinney, TX
It's awesome. But you have to paint it green now. ;)

Does it flex much?

Sent from my SAMSUNG-SGH-I537 using Tapatalk

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 Post subject: Re: More quad
PostPosted: Sat Jul 12, 2014 8:26 pm 
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Location: Austin, TX
I really want to get some of this Sintra to experiment with. From what I'm reading about it, I bet it would make an awesome core material in hollow-molded composite structures...

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 Post subject: Re: More quad "madness" . Ver 3.0. Need input
PostPosted: Sun Jul 13, 2014 11:30 am 
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tonkajeep34 wrote:
But you have to paint it green now. ;)


Kermit the Quad?


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 Post subject: Re: More quad
PostPosted: Sun Jul 13, 2014 7:19 pm 
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Joined: Mon Jan 21, 2013 8:26 am
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Location: Prince Albert, Saskatchewan, Canada
Hey Fella's .. Thanks for the input... don't think i will be able to paint it green however..

Sintra is an interesting material that would be a little hard to describe properly... Density would be similar to birch plywood, stiffness would be similar to plywood with no directional difference.. The material I use is 1/2" (13mm) thick.. the rough cutout shape of the frog quad is 400g. The routed areas are 10mm deep leaving 3mm thickness (1/8") skin on the top... this brings the weight to 240g ... Sintra is easily heat formed.. heat it in an oven at 240 deg (for 5 min) and it turns into a wet noodle.. it "sets up" in about a minute.. if you don't like the shape a trip to the oven will return the plastic to its original flat shape. I think it would be a little on the heavy side for a core material but it could offer some use as a reinforcing material for spar web cores and such..

Have to finish it and fly it now so I can decide whether its a keeper or not...


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 Post subject: Re: More quad
PostPosted: Sun Jul 13, 2014 8:16 pm 
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Location: Austin, TX
Hmm, OK. I guess its density is higher than what I expected. I was hoping it would be similar to Rohacell. Still, in 1mm thickness it might suffice. It would be fun to experiment with at any rate!

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 Post subject: Re: More quad
PostPosted: Thu Jul 17, 2014 8:57 am 
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Location: Houston, Texas
Interesting

I wonder how it would hold up in a car in Texas in the summer?

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 Post subject: Re: More quad
PostPosted: Thu Jul 17, 2014 9:25 pm 
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Joined: Mon Jan 21, 2013 8:26 am
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Location: Prince Albert, Saskatchewan, Canada
Don't Think it would do that well Ben.... But there is a magic spot for the heat... I put a bent piece in the oven with the part to be bent and when the bent sample straightens out the plastic is ready for bending.. Takes about 5 min at 230-240 deg... its used for outdoor signs so i think is should be able to take some sun... but in a car is another issue


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