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Old Jan 09, 2012, 09:49 PM
Smoke me a Kipper
fritzdecat's Avatar
Cedar Grove North Carolina
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this is all very new to me thanks for sharing your build

I would like to build something like this but have it powered by a 30cc gas engine

I looked around and it does not seem that anyone has the same inclination

Is my idea do-able?
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Old Jan 09, 2012, 10:04 PM
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Joined Jan 2007
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Brian, some other little weight saving tidbits I have used:
Foam wheels instead of rubber, going with slightly smaller mah battery packs as long as the model
balances and the pack can handle the amperage draw, for example, using 3600 or 3800mah instead of
4000mah - remember less wt. = less power needed/lower stall speed/lower wing loading. Lightening
holes where feasable. Not fully sheeting/glassing like we talked about. A lot of little savings can easily add up to 1/2 to 1 lb. weight savings. Even at 12 lbs. your wing loading is very reasonable, and the cubic loading with so much wing area works in your favor too.

Mark

Nice work on the retract installation BTW.
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Old Jan 09, 2012, 10:07 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Quote:
Originally Posted by fritzdecat View Post
this is all very new to me thanks for sharing your build

I would like to build something like this but have it powered by a 30cc gas engine

I looked around and it does not seem that anyone has the same inclination

Is my idea do-able?
Gas! Just kidding!

I personally don't do wet stuff. This particular plane is also a twin so you probably don't want to use a single engine gas or otherwise. See the first post in the design thread and you'll get an idea what it looks like.

How much power does a 30cc gas engine produce? You'll either need to go with two motors or go with something like the 2.6 meter Horten XII shown here:



Note that this plane is designed to land on it's belly. I can cut one of these for you.

Brian
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Old Jan 09, 2012, 10:19 PM
Smoke me a Kipper
fritzdecat's Avatar
Cedar Grove North Carolina
Joined Oct 2006
1,214 Posts
Whoa Thanks for the reply

I definitely want to build one like the guy is holding in the picture

What type of powerplant would that have?

Maybe the gas idea is wrong for a wing

I was just imagining a wing with 3 retracts etc with five hp gasser screaming around LOL
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Old Jan 09, 2012, 10:19 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Hey Mark,

I'm really just guessing on the weight at this point. We'll see what it really comes out at. I'm already using foam wheels and I definitely don't plan to fully sheet the wings panels. I'm also thinking of using something like Polyspan instead of Sig Koverall to save some weight. I figure the covering probably doesn't need to be as durable since it's not a belly lander.

Here's a thought...I was planing to use CC Phoenix ICE ESCs. I'm now thinking about using the the Ice Lite ESCs. That's 1.3 oz less weight per ESC. Hmmm! I guess it all depends on how things balance out.

Brian
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Old Jan 09, 2012, 10:23 PM
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United States, FL, North Port
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looks good Brian. maybe I missed it, but how are you supposed to install the batteries?
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Old Jan 09, 2012, 10:29 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Quote:
Originally Posted by fritzdecat View Post
Whoa Thanks for the reply

I definitely want to build one like the guy is holding in the picture

What type of powerplant would that have?

Maybe the gas idea is wrong for a wing

I was just imagining a wing with 3 retracts etc with five hp gasser screaming around LOL
That particular plane was designed around this motor. Although, many other motors with similar specs are available. A perfect example being this motor which is much less expensive. Please note that this plane is not designed to have retracts.

It's dinner time so I have to run...

Brian
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Old Jan 09, 2012, 10:47 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Quote:
Originally Posted by invertmast View Post
looks good Brian. maybe I missed it, but how are you supposed to install the batteries?
At this point the batteries will go up front under the canopy. Here's a screen shot in Rhino. The battery box is the dark green area with all of the holes. A good portion of the area above the battery box is a removable hatch.

Brian
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Last edited by cpdude; Feb 05, 2013 at 11:21 AM.
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Old Jan 09, 2012, 10:49 PM
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ahhh ok.. that makes sense now
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Old Jan 10, 2012, 08:57 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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The center section of the building board

Here are a couple of pictures showing the center section off the building board and the landing gear temporarily mounted.

Cheers!
Brian

p.s. The center section sure looks pretty stupid sitting there with the jig still attached.
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Old Jan 10, 2012, 11:07 PM
CNC Cutter
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United States, IN, Indianapolis
Joined Dec 2005
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I got this far on the T-deck mold
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Old Jan 10, 2012, 11:24 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Bob,

That looks nice! Look like a nice thick coat of primer. Yes?

Brian
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Old Jan 11, 2012, 01:39 AM
CNC Cutter
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United States, IN, Indianapolis
Joined Dec 2005
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Working on the Canopy now !

I just have never been a "Paint Guy" ya know !

I am not having good luck IMHO with this spray can primer.

It does NOT sand out easily and tends to really gum up and fill up the sand paper.
It dried for two weeks before I got around to trying to sand it.

So what you see is a different spray cans' worth of effort.
Krylon Plastic Paint.

I suppose I should have gotten some enamel or something that dries HARD.

Being a Newbee at this Mold making is my only defense.

When you get my best at this effort , it may still not be good enough !

Oh well.
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Old Jan 11, 2012, 09:17 AM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Hey Bob,

Regardless, it looks good. Remember it's only going to be a plug. If things go well it'll be used once to make the actual mold. I appreciate your work on this project! I find that warming up the can and then putting the part out in the warm sun help it harden. I'm guessing that you don't have much warm sun right now.

Brian
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Old Jan 11, 2012, 10:23 AM
I don't like your altitude
Stupot46's Avatar
Joined Sep 2011
3,382 Posts
Bob,If you can find some,try water based acrylic primer.If you're sanding any way a few brush marks won't matter.You can get good coverage and be ready to sand in a few hours.
Stuart
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