Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Shark 21

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Old 04-03-2007, 11:55 AM
  #1  
look
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Default Shark 21

I am building a new fast model the Shark 21 with 115cm wingspan.
Engine Nova Rossi 21 with 2,4 HP and a muffled rear exhaust.
Wing is sheeted with 0,4mm thin plywood.
With an OS 32SX this model was very fast with an APC 7x6 wide prop.
Motormount CNC alu.
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Old 04-03-2007, 01:38 PM
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Default RE: Shark 21

Engine Nova Rossi 21 2,4HP
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Old 04-03-2007, 01:39 PM
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Default RE: Shark 21

CNC alu mount and spinner Tru Turn 1,75 inch:
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Old 04-03-2007, 01:41 PM
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Default RE: Shark 21

Wing, stab and fuse:
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Old 04-03-2007, 01:44 PM
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Default RE: Shark 21

Wing is sheeted with 0,4mm thin plywood reinforced with glasscloth.
Stab is sandwhich 0,6mm plywood and 2x 2,5mm balsa.
Stab needs to be sanded in airfoil shape.
Now I can glue in the wingspar from 3mm plywood.
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Old 04-03-2007, 02:25 PM
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Default RE: Shark 21

do you have the web page for that plane?
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Old 04-03-2007, 03:11 PM
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look
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Default RE: Shark 21

www.speedmodels.nl
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Old 04-08-2007, 05:12 AM
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Default RE: Shark 21

Nice
What is your pipe setup ?
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Old 04-08-2007, 07:04 AM
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look
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Default RE: Shark 21

Hi,
Do you mean the length ?
I use a S- shape header from Nova Rossi and a muffled Rossi tuned pipe.
At the moment wing and stab are ready for glassing.
Yesterday I have put in the middle of the wing some glasscloth.
I hope to paint the model in a week.
Happy Eastern !!
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Old 04-08-2007, 01:05 PM
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Default RE: Shark 21

That's a nice looking airplane! The fuselage looks like the Stinger 21/40, is it the same? I have a Stinger 40 waiting to be built, I can't decide whether to put on a Nelson Q40, Jett .50 or West .50.
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Old 04-08-2007, 02:00 PM
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look
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Default RE: Shark 21

Yes, it is based on the Stinger 21.
Both come from the Stinger 40.
I have scaled down the Stinger 40.
The Shark is also made for electric.
It has an opening for cooling on the front.
I have designed the Stinger 40 for a Nelson FIRE.
It flies very fast, use 3mm rods for the Aileron or 4-40.
It my first flight 2mm steel was broken on one aileron.
I was lucky the engine was running rich.
Regards,
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Old 04-08-2007, 02:37 PM
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Default RE: Shark 21

how did you get that engine? I am looking for the same engine with side exhaust.

Can you help?

Thanks
Brian
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Old 04-08-2007, 02:44 PM
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look
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Default RE: Shark 21

Ordered in USA by Performance specialities.
The Q (side) has less power.
Why not a rear exhaust ??
Regards,
Look.
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Old 04-08-2007, 03:10 PM
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Default RE: Shark 21

My Stinger (and Stiletto and Kasumi) wings appear to be sheeted with abachi wood; how does the 0.4 mm plywood compare for weight and strength? Seems like it might be heavier, but then again maybe also smoother for less sanding and filling, and possibly more torsional stiffness. Thanks for the tip on the linkages. I would have used 2-56 (slightly larger than 2 mm) otherwise. I guess plastic clevises are also a bad idea, but 4-40 metal clevises or plastic ball links ought to be ok. I also was unaware that Performance Specialties was carrying the Novarossi engines.
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Old 04-08-2007, 03:49 PM
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Default RE: Shark 21

Ok look, it was the pipe brand. This is hard to find stuff btw...
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Old 04-08-2007, 10:00 PM
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Default RE: Shark 21

The plane i am going to put it on would take alot of work to run the pipe. It's easyer just to run Performance specialities tuned muffler.
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Old 04-08-2007, 11:21 PM
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Default RE: Shark 21


ORIGINAL: look

Ordered in USA by Performance specialities.
The Q (side) has less power.
Why not a rear exhaust ??
Regards,
Look.
Look,

You had to order a European built engine through an American company...?! [X(]

There's no way to get these things through a European dealer?
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Old 04-09-2007, 04:12 AM
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Default RE: Shark 21

@electric:
I think the plastic connectors will hold 1 minute.
Always use steel, thick as possible.
The thin plywood is some more heavy but stronger.
With strong engines I always use the thin plywood.
I ordered the Nova Rossi at Nova Rossi in Italy.

@Strykaas:
You are right.
Modellmotorentechnik.de sells some engines and pipes.
The most stuff you need they have in stock.
Roland Dieterle sells Rossi engines and he can repair an engine if broken.
I think he can advise you to tune up your engine.

@Fly4:
Yes, that is OK.
I did not know they are selling a muffled tuned pipe.

@Rudeboy:
I ordered the Nelson FIRE with Performance specialities and I ordered the Nova Rossi in Italy at the factory.

The second 160 gramms glasscloth has been put on the wing middle
with slow epoxy.
Today I can put some very thin glasscloth (25 gramms) with very thin epoxy on the wing and stab.
I use epoxy for rotten wood.
Regards,
Look.
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Old 04-10-2007, 08:59 AM
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Default RE: Shark 21

i have one that im not going to use!


Corey
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Old 04-10-2007, 09:15 AM
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Look.
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Old 04-18-2007, 01:53 AM
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Default RE: Shark 21

The wing and stab are painted with a 1K base coat.
Next step is adding some black and white racing blocks and the 2k clear coat.
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Old 04-18-2007, 01:54 AM
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Default RE: Shark 21

Sample racing blocks:
At the moment I am painting two models.
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Old 04-18-2007, 06:35 AM
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Default RE: Shark 21

Black and white ready.
Tomorrow a layer of 2K clearcoat.
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Old 04-18-2007, 09:50 AM
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Default RE: Shark 21

Thats a really sharp looking scheme man...I like
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Old 04-18-2007, 10:31 AM
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Default RE: Shark 21

Thank you !
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