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

Speed models Beretta

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Old 03-27-2008, 12:41 PM
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ecoliburger
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Default Speed models Beretta

Anyone built one of these? I have one in the rafters that I have been thinking about selling. Just dont know if I have the time to build it. Hesitate selling it because it is such a cool plane but Ive had it for probably a year and have not started on it. got a new in the box OS 25 ducted fan engine that I was going to use. Just looking for some input, build or sell what do you think?



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Old 03-27-2008, 12:43 PM
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Default RE: Speed models Beretta

It looks built to me
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Old 03-27-2008, 12:59 PM
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Default RE: Speed models Beretta

Wow, that is a slick-airframe.

I would build it or else every time you see a pic like this you might regret having sold it....
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Old 03-27-2008, 01:13 PM
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Default RE: Speed models Beretta

It looks built with a Nelson Q40 engine in it?
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Old 03-27-2008, 01:43 PM
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Default RE: Speed models Beretta


Ecoliburger:

Please don't tell "Big D" or I where you live, the plane may be missing some morning. Naturally I think you should sell it, to me, cheap. I could hang it on the ceiling next to my Rusty Miss Ashley that is gathering dust waiting for the eyesight to possibly be corrected, maby May or June, snivle, snivle, snivel. It sort of looks like something the European Speed Cup guys would be draging out, go like heck for two or 3 flights prior to the big bang. Hope you have some tall guy in the club willing to hand launch that thing, reminds me of several nice looking birds that did not make it past the launch stage. Oh well, ENJOY
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Old 03-30-2008, 10:43 AM
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Default RE: Speed models Beretta

You have to build it. It fies like a dream !!
You always will be thinking I sold an excellent plane for nothing.
It flies extremely well !! Take the time and build it !
You will love this plane.
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Old 03-30-2008, 05:22 PM
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Default RE: Speed models Beretta

I think this motor, with 60% nitro would be fun in the nose
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Old 03-31-2008, 01:55 PM
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Default RE: Speed models Beretta

That engine will give a lot of fun !!
You can find the Beretta at:
www.speedmodels.nl
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Old 03-31-2008, 02:09 PM
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Default RE: Speed models Beretta

Picture of my Beretta with Nova Rossi 2,4 hp:
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Old 03-31-2008, 02:12 PM
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Default RE: Speed models Beretta

This is Nick's Beretta 21.
We always use a APC 7x6 wide gives a lot of power specially in turns or going up.
Nick and I flew a lot with these models. Soon we will fly it again when the flying field has dried.
There has been a lot of rain last weeks.
Because of the fully covered engine and exhaust the Beretta flies very clean.
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Old 03-31-2008, 02:18 PM
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Default RE: Speed models Beretta

When you start the model give it a light throw and let the prop do the work.
Do not throw hard. Important is a reliable running of the engine with full power.
Engine must be run in. We have good experience with the APC 7x6 wide.
With a 40 pylon engine you can use an 7.8x8 prop.
Spinner is 1,75 inch or 45mm. Always use an alu motormount for max. rpm.
Use 5 to 15% nitro that is enough. Model is available with o,4mm plywood wing.
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Old 03-31-2008, 05:21 PM
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Default RE: Speed models Beretta

Look,
Any chance you can get a video of the thing next time you fly it?
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Old 04-01-2008, 01:58 AM
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Default RE: Speed models Beretta

Hi all,
I can tell you this bird really fly's fast[>:]very fast......
If you wanna have a real KICK >>> FLY IT <<<
Very stable and smooth at the landing.
Not a beginners plane, you must have some speed experience.
If you're an beginner the shark is an better choise.
If you've had it all.....go for the beretta!!!
And, only fly it at PCM !!!!!!!!! We have had some bad flights on ppm.
Grtz
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Old 04-01-2008, 07:49 AM
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Default RE: Speed models Beretta


ORIGINAL: ecoliburger

Anyone built one of these? I have one in the rafters that I have been thinking about selling. Just dont know if I have the time to build it. Hesitate selling it because it is such a cool plane but Ive had it for probably a year and have not started on it. got a new in the box OS 25 ducted fan engine that I was going to use. Just looking for some input, build or sell what do you think?



Definitely sell it. To me!

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Old 04-01-2008, 09:52 AM
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Default RE: Speed models Beretta

ORIGINAL: MJD


Definitely sell it. To me!

MJD
Well this particular Beretta with Nelson FAI 40 was trashed during maiden here in Germany.

Main problem with the Beretta design is, that at about 200 mph the leverage (between stab and COG) turns out to be too small to achieve smooth controlled high speed straight line flight. Even with very small elevator deflection and with dual rate and/or expo function it is a hard job to fly a Beretta at 200 mph. For comparison please take a look at the purpose built speed plane designs for the German Speed Cup. These have been optimised for smooth straight line handling without the risk of a heart attack.

The 10 or 15 year old Beretta design on the other hand obviously has been derived from Club 20 pylon racing, where fast cornering is essential.
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Old 04-01-2008, 12:47 PM
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Default RE: Speed models Beretta

If we go to fly the Beretta we will make a video. So you can see it flies excellent on a 21 to 32 engine.
I have never seen flying the Beretta with a 40 pylon but heard that more people have flown with a 40 engine.
I think its better to use a smaller but fast engine on this model. I love to fly it with a 3,5cc engine.
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Old 04-02-2008, 05:29 AM
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Default RE: Speed models Beretta

Indeed the Beretta is a great speed machine especially for the advanced speed pilots. There are many around here in Europe. If kept lightweight, it glides superbly providing easy landing characteristics!

ORIGINAL: look

I think its better to use a smaller but fast engine on this model. I love to fly it with a 3,5cc engine.
For a speed target of about 170 mph it really should be powered with ultra high performance 3.5 cc engines such as:


Novarossi RX .21 FRV (FIRE, 7-port design, speed venturi carb)

Novarossi R PLUS 217/FT (FIRE, 7-port design, speed venturi carb optionally)

Rossi .21 Piranha or Niagara (FIRE, 7-port design, converted car or marine engine using a speed venturi carb and an aero cylinder cooling head)
http://pagesperso-orange.fr/xavier.c...iranha_US.html

Rossi 63 R .21 C (FIRE, 6-port design, optionally available with speed venturi carb)



Turbo plugs and a non-muffled full length tuned pipe are highly recommended for best performance.

However, when using above or similar engines (in-flight rpm > 30000) you have to consider an integrated style aluminium spinner (backplate and driver = one-piece design) and of course carbon fibre props.


Please note: If you find the engine crankshaft length at the front too short for proper spinner/prop fixing, there are numerous adapters available made by Tru-Turn for instance. These adapters do extend into the (widened) prop central bore thus allowing to use speed props with a thicker hub, being common with oversquared speed prop designs.

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