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Author Topic: New rubber model  (Read 3467 times)
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Tom Barnett
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« on: June 14, 2010, 01:47:45 AM »

Hello all,

Here's some photos of my newly designed rubber powered model. 20"span 7" or 8" prop with 4 to 6 strands of 1/8" rubber depending the prop.

It doesn't have a name yet and the plans were only drawn just enough to build the first prototype.

All I need now is the DT and I can cover.

Wish me luck on the test flights!

Tom
Attached files Thumbnail(s):
New rubber model
New rubber model
New rubber model
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thymekiller
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« Reply #1 on: June 14, 2010, 06:26:07 AM »

Looks Good. I like the structure around the cabin area.
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applehoney
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« Reply #2 on: June 14, 2010, 12:41:04 PM »

Looks very practical and 'right' ....
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NormF
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« Reply #3 on: June 14, 2010, 02:00:52 PM »

Hi Tom,

I like it! Cover it orange and you could call it the "Perris Poppy".

Seeya!

- Norm F
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Tom Barnett
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« Reply #4 on: June 14, 2010, 05:31:50 PM »

A great name Norm!! So be it!

THE PERRIS POPPY

Tom
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Sundance12
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« Reply #5 on: June 14, 2010, 06:21:06 PM »

Now there is a smart looking sport rubber design, Good style, a little rake in the rudder, and a bit of sweep in the wing. That lowboy look of the cabin is cool. Proportions look right. Good Job, cover it up with a bit of flashy color and get it in the air.

Sundance 12
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Tom Barnett
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« Reply #6 on: June 14, 2010, 11:32:42 PM »

Thanks everyone!

It should fly within a week or two. DT then cover. Then I must finish the plans.

Happy flying,

Tom
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Dimeflyer
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« Reply #7 on: June 18, 2010, 10:56:55 PM »

Good show Tom!

George
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crashcaley
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« Reply #8 on: June 18, 2010, 11:00:53 PM »

Tom, That certainly looks great. I can't wait to see it fly. And probably then I'll be pestering you for a copy of the plan.  Smiley

Caley
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Tom Barnett
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« Reply #9 on: July 05, 2010, 02:34:42 PM »

Greetings all!

I did some flight testing last week that required re-building the wing and tail surfaces. The first flights looked very promising but it had a tendency to spiral into the right after the turns ran out. Left rudder, and a rudder extension helped this only a little. Then in a moment of "crazy" experimentation I put the wing on backwards with the trailing edge first and it flew great without the spiral dive! I figured my leading edge sweep back might be causing the problem and I guess it was! The straight wing L.E. had more positive results than the backwards airfoil.

The photos show the model with a new wing and tail ready for test flying again at Perris this Weds. It should fly even better.

Tom

Ratz edit: modified pic exposures
Attached files Thumbnail(s):
Re: New rubber model
Re: New rubber model
Re: New rubber model
« Last Edit: July 05, 2010, 03:29:30 PM by Ratz » Logged
crashcaley
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« Reply #10 on: July 05, 2010, 03:21:02 PM »

Tom,& You certainly are talented. That's a nice design. If I make it to Perris this Wednesday. I look forward to seeing it hit the stratosphere. Make sure you use a D/T. Smiley

Caley
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What's stall speed?  Undecided
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« Reply #11 on: July 05, 2010, 04:17:17 PM »

Looks good. I was wondering if you'd have yaw instability with that small rudder and extensive aerodynamic dihedral from the sweep back. I ran into the same problems with my new Goon because of the same reason. It's flying much better now with a bigger rudder.
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applehoney
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« Reply #12 on: July 05, 2010, 06:52:13 PM »

Rudder looks OK to me. The proof will be in the flying .....
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Duco Guru
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« Reply #13 on: July 05, 2010, 09:36:23 PM »

Looks good. I was wondering if you'd have yaw instability with that small rudder and extensive aerodynamic dihedral from the sweep back. I ran into the same problems with my new Goon because of the same reason. It's flying much better now with a bigger rudder.

The flying session will be the proof in the puddin'..

I have to side with Josh, I have a sport/embryo model that looks much the same. Took a sub rudder to fix it Undecided

Guru
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Tom Barnett
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« Reply #14 on: July 08, 2010, 10:56:56 PM »

It's a great flyer!

I took the Poppy out Weds to Perris. It flew great but was a bit underpowered. This morning I flew it with a 8" prop and the same 4 strands of 1/8" rubber and wow! I got much more altitude and much longer flights. The last flight required the DT or I would have lost it. I didn't have a timer on it but it must have flown at least 2 minutes on the last flight.

Now I have to finish the plans. It could take a while but I will finish them.

Tom
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crashcaley
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« Reply #15 on: July 09, 2010, 08:29:31 AM »

Tom, It sure did fly great, and I think it's a winner. Great design. Are you going to kit this through Clint's business?

Caley
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What's stall speed?  Undecided
Tom Barnett
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« Reply #16 on: July 10, 2010, 10:04:05 PM »

Thanks Caley,

No plans to kit this design. It's all sticks so a kit is unnecessary. I will finish the plans eventually and make them available but that's NOT the fun part so it may take a while. I flew it again today at my Apple Valley field and it's very consistent.

Tom
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