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

Wich size rossi engine for DD? Help

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Old 08-05-2005, 07:41 PM
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Default Wich size rossi engine for DD? Help

Hi.
I am planing on building a DD and puting in a rossi engine.
Wich rossi will make this airplane really fast?
maby over 140MPH???


Thanks


Aksel
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Old 08-05-2005, 09:01 PM
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Cyclic Hardover
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Default RE: Wich size rossi engine for DD? Help

I am not a Rossi guy but i will tel you what I have seen, A couple guys here have the DD. One has a Rossi but cant rmember what size but its in the late .40's to 50 range and it moves and were at 5000ft. The other guy has a simple TT 46pro with a performance spec Ultra thrust muffler and a 9/7 apc. 17000rpm and he is running right up with the other guy. Something to consider. Maybe just to get the feel of the plane for a while, then invest in a good engine.
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Old 08-05-2005, 10:16 PM
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Default RE: Wich size rossi engine for DD? Help

I am not sure of the weight difference between the 40 and 45 but I usually recommend the Rossi-45 since you can use it on other more draggy airplanes later if you so choose- They make a Rossi-40 Rear Exhaust that is a better match for the delta, but again restricted use on other airframes--

The TT Pro-46 plus the P/S Pipe seems about the same price as the Rossi-45 isn't it? I love my Rossi's and have not had problems with the mid-range or tuning

Cheers!
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Old 08-08-2005, 04:03 PM
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Default RE: Wich size rossi engine for DD? Help

Can I recommend a different scenario for you?
I would highly recomend "in the factory out of box engine" the Irvine MkIII .46 engine.
I cant begin to tell you how well this little out of boxer tachs up using one of my pylon racing props. I meen to tell you this thing is very very impressive!!! I think I had the 9X10 prop on it when I tached it at 17,900rpm without any adjustments to the stock carb! I hate to think of what it's unloading at in the air after it gets moving! I put this engine in the "Miss Candace QM-40" racing plane and WOW! I couldn't believe what I was seeing. It went "what seemed to be" nearly as fast as the Racing engine did.
Once again, unless I got the crown jewl of Irvines available stock, I think you'll be pleased with this one.

Just some food for thought,
Jim
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Old 08-08-2005, 06:26 PM
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Default RE: Wich size rossi engine for DD? Help


ORIGINAL: thisoneused

I think I had the 9X10 prop on it when I tached it at 17,900rpm without any adjustments to the stock carb.......unless I got the crown jewl of Irvines available stock,........

Jim
If you turn a 9x10 at 17,900 rpm static you do have the "crown jewl". You need to tach it again and say it was rather then I think.
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Old 08-08-2005, 08:26 PM
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Default RE: Wich size rossi engine for DD? Help

Well it's still haning on the front of the plane so I'll go check it....Well half of it is anyhow! I broke that one on a nose over. Haven't flow it since then...to many others to choose from....lol.
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Old 08-08-2005, 08:47 PM
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Default RE: Wich size rossi engine for DD? Help

I hate to feed a troll, but a 9x10 at that rpm would outperform a .40 Jett or Nelson.

Highly unlikely, in fact, I would say impossible.
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Old 08-08-2005, 09:03 PM
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Default RE: Wich size rossi engine for DD? Help

Like I said...I'll go look at it. I use several different sized props so let me go see which one it was for sure.
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Old 08-08-2005, 09:07 PM
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Default RE: Wich size rossi engine for DD? Help

OK..I broke away from the autocad to go look. It was an 8.75X9 prop.
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Old 08-08-2005, 10:04 PM
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Default RE: Wich size rossi engine for DD? Help

Daven, I have a Shrike here at 5000ft.46pro and a Ultrathrust turning 17k on a 9/7. It is a mover.
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Old 08-08-2005, 10:39 PM
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Default RE: Wich size rossi engine for DD? Help

My WEBRA .50 has taken a 8x9 [or was it 8x10?] close to that 20,000 mark. It blew the blades off too. My point is, it might not be that far fetched a claim as you might think, I have heard that those IRVINES .46s run pretty good.
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Old 08-09-2005, 12:14 PM
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Default RE: Wich size rossi engine for DD? Help

I hope I misslead know one in retrospect of looking for approval of my own findings. What I have to say is fact and thats all. When I'm veigh on something, I state it as such and will always be glad to follow up with the subject to confirm certain points of conversation.
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Old 08-09-2005, 10:12 PM
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Default RE: Wich size rossi engine for DD? Help

There was a great article in one of the mags, over 10 years ago, it was about rating all of the mainstream engines in different categories. Categories like power to weight, low to high rpm, and other things I can't remember. If this article is ever updated, I would like to see JETT and NELSON included, as well as bringing some of the newer engines into the comparison. The IRVINE sounds like an excellent choice for a speed plane if the engine has good longevity for its' price
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Old 08-09-2005, 10:26 PM
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Default RE: Wich size rossi engine for DD? Help

I wish I could comment on its longevity, but I have only had mine for two years. So far so good though! I can only express the nice suprise I get when that thing responds like it does to the throttle control. I should inform all reading, that I have an aftermarket header pipe on it as well. I did not get a tuned system as of yet for it. It is simply an open header pipe. There might be room for improvement once a header muffler is fitted and the header length cut down for max performance.
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Old 08-10-2005, 08:21 AM
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Default RE: Wich size rossi engine for DD? Help

8 3/4" x 9 at 17.9k is at least almost believable, but still quite strong.

Would love to see one, everyone seems to talk about the Irvine .53, but you don't hear much about .46. We run the O.S. FX and now the AX in local racing, and were lucky to top 16.5k with that prop. Found out that a 10x7 at 14.5k is actually faster overall in lap times.

I would love to see a comparison of the high performance engines (Nelson / Jett) to the next tier (Mvvs / Rossi / Webra) and to what most would consider standard sport engines. Then add a semi-tuned pipe like the Ultrathrust, jett, or even the tower.
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