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

Re-thinking engine choice? Rossi to what?

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Old 05-31-2009, 08:40 PM
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Avaiojet
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Default Re-thinking engine choice? Rossi to what?

A long time ago, actually, a really long time ago. I drew plans for a 55" jet with a prop drive. The C-101 Avio. I was to us my Rosi 61 RE. The model is framed but still has a way to go before completion.

I'm re-thinking the engine. Mostly because of the weight of the Rossi. Being up front and all, plus the nose moment isn't the shortest.

A suitable engine made today, possibly lighter and with greater RPM's could carry this fine model a bit faster than the Rossi. Am I dreaming?

I can get photos if necessary. Unfortunately they will be black and white. This is the only color photo I have.

The model I'm referring to is on the box in the middle of the photo.
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Old 05-31-2009, 09:46 PM
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Default RE: Re-thinking engine choice? Rossi to what?

Cool picture. Do we have a little trouble finishing things?
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Old 05-31-2009, 09:50 PM
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Default RE: Re-thinking engine choice? Rossi to what?

Avaiojet,

How about a Jett .60 FIRE LX (http://www.jettengineering.com/) which is much lighter/compact than the Rossi. You could even go up to a Jett .90with probably lighter weight than the Rossi .60.

Nice workshop...... good luck with the project!
P
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Old 06-01-2009, 07:46 AM
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Default RE: Re-thinking engine choice? Rossi to what?

still4given,

Cool picture. Do we have a little trouble finishing things?
I have ADD and don't take medication, which BTW is the truth.

Here's other views of my Crib, showing many other unfinished models and some in the process of a redo.

About the Rossi. The engine has to be rear exhaust, I have the set-up so the pipe goes through the fuselage.

I would need performance and weight charts on the Jett engines.

Thing is, the weight loss plus performance would have to be a really good benefit.

Jett got charts?
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Old 06-01-2009, 08:28 AM
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Default RE: Re-thinking engine choice? Rossi to what?

I have the same problem. I love gluing sticks together but hate covering. If I had the time to build, my shop would look just like yours.

Jett doesn't have charts but you can find out a lot of info here.

http://www.jettengineering.com/

He doesn't believe in posting HP ratings. Too easy for manufactures to fudge the numbers. He gives RPM figures with known props. His engines run very strong and are very reliable. A favorite of most speed guys.

You are going to hear his name more and more now that Nelson has stopped making engines.

Blessings,Terry
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Old 06-01-2009, 09:57 AM
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Default RE: Re-thinking engine choice? Rossi to what?


ORIGINAL: Avaiojet

still4given,

Cool picture. Do we have a little trouble finishing things?
I have ADD and don't take medication, which BTW is the truth.

Here's other views of my Crib, showing many other unfinished models and some in the process of a redo.

About the Rossi. The engine has to be rear exhaust, I have the set-up so the pipe goes through the fuselage.

I would need performance and weight charts on the Jett engines.

Thing is, the weight loss plus performance would have to be a really good benefit.

Jett got charts?
No charts per say....... engine weights and performance figures are on the website. Beyond that I can tell you what you want to know.

Jett 90Lis appx the same size/weight at a current OS61FX/90FX, and a bit lighter than the Rossi 61. 12x6 or 11x8 prop up over 14,500 rpm.

Jett60LX is a "46"size engine.FIREconfi Consider this a 10x6 prop size engine on steroids. For your prop jet, this might work out well.

One other option to look at.... OS55AXwith the Jett muffler. This is a side exhaust combination, but it has proven to be quite a little power house. Use a 11x6, 11x7 prop.

For a good example of this OS55/Jett powerplant combination, look at the videosand threadBlade47 has for the F-16 and F-18 builds. These are both 9 pound prop-jets, and the weight savings allowed them to perform great on this engine setup.

Bob

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Old 06-01-2009, 06:07 PM
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Default RE: Re-thinking engine choice? Rossi to what?

Thanks guys,

I'll get some photos Posted,so there will be a better undestanding as to why I need a rear exhaust engine.

Charles
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Old 06-20-2009, 12:05 PM
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Default RE: Re-thinking engine choice? Rossi to what?

This is the model.

I actually thought of converting it to turbine and may still consider turbine. I reached out for help in a Thread directed at Turbine enthusiasts. I'm looking into it and picking up information.

EDF may be out of the question because this may be a model of extra weight because of the way it's built. EDF's are costlynot to mentionthe cost of the batteries. This expense could almost buy a Turbine engine.

I may just be better off to keep the original engine I planed for, The Rossi 61 FIRE. I was hoping a smaller and lighter rear exhaust enginecould be as good or better?

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Old 06-20-2009, 03:27 PM
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Default RE: Re-thinking engine choice? Rossi to what?

"I was hoping a smaller and lighter rear exhaust enginecould be as good or better?"

Your question has been answered above....

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Old 06-20-2009, 06:55 PM
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Default RE: Re-thinking engine choice? Rossi to what?

For a good example of this OS55/Jett powerplant combination, look at the videosand threadBlade47 has for the F-16 and F-18 builds.
I came up with nothing and I've search F-16 and F-18 plus Blade47.

Is there some secrete to finding that stuff?

Charles
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Old 06-21-2009, 01:36 AM
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Default RE: Re-thinking engine choice? Rossi to what?

i hate looking at any JETTS with PROPS on the nose. have you thought of going to DUCTED FAN ?
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Old 06-21-2009, 07:17 AM
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Default RE: Re-thinking engine choice? Rossi to what?

Hi

You might consider an os 91 ducted fan. I used them on Mustangs and the were awesome... 11-8 apc at well over 20 k in the air.....
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Old 06-21-2009, 08:40 AM
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Default RE: Re-thinking engine choice? Rossi to what?

Freeair,

I agree, I hate looking at Jets with props also especially when the spinner doesn't point right. They look turned up. Ugly! Kinda like looking at yourself in a mirror. I know I don't like what I see. I have a bunch of down thrust to avoid that look, so my spinner flows with the lines of the nose.

DF could work but I don't think I have the needed intake area and I don't want to make any cheater holes. Weight could be an issue also, because the construction is a bit heavy. Some weight can be trimed. I don't know enough about DF, EDF, or Turbines.

I have Threads asking for Turbine help and info, based on my model, which is probably a mistake. Also Threads on DF and EDF info.

My guess is I should scrap this model for Turbine and start fresh with a much better airframe. There may have been hints to that. Probably really good and truthful advice.

This year the wife and I move to FL permanately, so I'll see plenty of Jets and Jetpilots first hand. I can't waite for that, should be interesting. I saw only one Turbine fly, an F-15, and this was years ago. Astonishing to say the least. Kudos to Jets and Jet pilots!

Anyone ever been to a Jet Rally? .

Hey! Why doesn't my Smiley box open all the way?

Charles



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