Rossi 53 - dud??  
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Rossi 53 - dud?? - 11/28/2007 1:13:20 AM   
5.0Rick


 

Posts: 38
Joined: 2/8/2005
From: Round Rock, TX, USA
Status: offline 		Hi All,

I finally got my Rossi 53 installed on my Sky Raider and I am thinking there might be something wrong with it (not enough power). I ran some numbers in ThrustHP and according to the numbers it is only making 1.6 HP and not anywhere close to the 2.3 HP that is advertized. Could it be that the engine is not broken in yet? I have ran approximately half a gallon through it. Could it be the Rossi mini tuned pipe holding it back?

Here are the specifics:

Rossi 53 with the Tuned Mini Pipe (Black pipe)
Rossi R-6 Glow plug
Power Master 5% Nitro 18% oil

APC props and RPMs achieved

10x7 15,000 RPM
9x9 15,580 RPM
9x8 16,380 RPM

If you have the same setup, I would like to hear from you.

Thanks,

Rick

       Post #: 1

RE: Rossi 53 - dud?? - 11/28/2007 1:40:47 AM   
vertical grimmace


 

Posts: 1227
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		Those numbers do look a little low. Especially for the 10-7. I am sure my OS .46 AX was spinning that prop around 16,000 or so. I have a .67 and have not run it much but I was not blown away by the power when I did run it.

< Message edited by vertical grimmace -- 11/28/2007 1:41:16 AM >

(in reply to 5.0Rick)
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RE: Rossi 53 - dud?? - 11/28/2007 3:20:04 AM   
Julian537


 

Posts: 506
Joined: 7/11/2004
From: bedford, TX, USA
Status: offline 		put the jett SS pipe on it and watch it scream (black short one)
18160 on a 8.5*7.5
unload it!
mini pipe may be holding you back!

< Message edited by Julian537 -- 11/28/2007 3:23:46 AM >

(in reply to vertical grimmace)
       Post #: 3

RE: Rossi 53 - dud?? - 11/28/2007 4:06:10 AM   
vertical grimmace


 

Posts: 1227
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		I do wonder about that muffler. My .67 has the black mini pipe muffler as well. I wonder if that engine really wants a full pipe. They advertise to run a 12-12 prop on it for pattern but there was just no way it would spin that.

(in reply to Julian537)
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RE: Rossi 53 - dud?? - 11/28/2007 4:21:17 AM   
Flyboy Dave



Posts: 13522
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline
quote:

Could it be the Rossi mini tuned pipe holding it back ?


Could be....that is really the run-of -the-mill pipe for the Rossi's. They do
a fine job for what they are, but I would expect better performance with a
better pipe. I get over 18K out of my .45 with a Rossi long pipe....

....and it is a generic pipe for the 45 through 60. I would suspect it would
work fine on the 51 as well, but you would probably have to go down to a
9-7, 9-8 prop for some serious RPM.

You might want to try something other than the APC prop as well for RPM.

FBD.


_____________________________

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A mechanic says..."Oh yeah, watch this".
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RE: Rossi 53 - dud?? - 11/28/2007 4:46:48 AM   
still4given



Posts: 496
Joined: 1/27/2006
From: Victorville, CA, USA
Status: offline 		How short is that pipe? It may be that it is too short for the props you are running or too long. You might try flying it with a 9x7 for a few flights and let it turn up. Things might still be a little tight.

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RE: Rossi 53 - dud?? - 11/28/2007 5:24:38 AM   
combatpigg



Posts: 10140
Joined: 11/22/2003
From: arlington, WA, USA
Status: online 		Doesn't anybody believe in getting a baseline reading with open exhaust?
The mechanical checks to see if you are beating a dead horse are easy to do.

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RE: Rossi 53 - dud?? - 11/28/2007 5:28:11 AM   
Flyboy Dave



Posts: 13522
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline 		....very, very true.

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

(in reply to combatpigg)
       Post #: 8

RE: Rossi 53 - dud?? - 11/28/2007 12:22:09 PM   
vertical grimmace


 

Posts: 1227
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		I like running open exhaust! Reminds me of a time long past. I think I will try that.

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       Post #: 9

RE: Rossi 53 - dud?? - 11/28/2007 1:48:18 PM   
freakingfast


 

Posts: 866
Joined: 1/3/2005
From: mather, CA, USA
Status: offline 		SG Model engines also list a Rossi 60 with a Pitts muffler @ 2.9 hp. , I don't think so.....With open face or tuned pipe maybe closer to the number.
I did a Sky Raider but it was very prone to flutter at high speed(all control surfaces) and would be too much work for me to justify the mods to fix it. My main probem was I over powered it (OS 55 ax & 11x7) and cleaned it up to much (cowling /race wheels). It served it's purpose, I beat someone I gutted it and sold it at a swap meet. These are fine planes with just a plain Jane 46 engine. Just don't get carried away like I allways do.

Attachments
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RE: Rossi 53 - dud?? - 11/28/2007 1:54:59 PM   
5.0Rick


 

Posts: 38
Joined: 2/8/2005
From: Round Rock, TX, USA
Status: offline
quote:

ORIGINAL: combatpigg

Doesn't anybody believe in getting a baseline reading with open exhaust?
The mechanical checks to see if you are beating a dead horse are easy to do.

Thanks for the tip. I will try that, just one question... How do I pressurize the fuel tank without the pipe installed?

Rick

(in reply to combatpigg)
       Post #: 11

RE: Rossi 53 - dud?? - 11/28/2007 1:58:58 PM   
5.0Rick


 

Posts: 38
Joined: 2/8/2005
From: Round Rock, TX, USA
Status: offline
quote:

ORIGINAL: freakingfast

SG Model engines also list a Rossi 60 with a Pitts muffler @ 2.9 hp. , I don't think so.....With open face or tuned pipe maybe closer to the number.
I did a Sky Raider but it was very prone to flutter at high speed(all control surfaces) and would be too much work for me to justify the mods to fix it. My main probem was I over powered it (OS 55 ax & 11x7) and cleaned it up to much (cowling /race wheels). It served it's purpose, I beat someone I gutted it and sold it at a swap meet. These are fine planes with just a plain Jane 46 engine. Just don't get carried away like I allways do.

Nice looking plane! Did you fabricate the cowl? Fiberglass I take it? Very nice work

I also encountered the flutter issue with the ST 51 installed. Fixed it by installing aileron servos on the wings.

Rick

(in reply to freakingfast)
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RE: Rossi 53 - dud?? - 11/28/2007 2:48:56 PM   
bob27s



Posts: 4924
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Sparing the tutorial on published HP info, can you identify where is the engine advertised as producing 2.3 HP ? Also, please note the rpm that might be suggested at which it develops that power?

you are on the right track - the "45 size" rossi mini-pipe is rather short-tuned. Needs to be propped to turn over 16,500 to function worth a hoot. Also, the o-ring style mini-pipe tends to leak at the o-ring if you to not properly support the tail of the muffler. Gas leakage past the o-ring can cause problems and inconsistant running.

The 9x8 info you have there is about in line with where it will want to run. In the air it probably comes on the pipe just about right. Something more along the lines of a 10x6 should turn up there too.

However, the 53 is bit lower timed (IIRC) than the .40 and .45 engines. More intended for the quiet euopean market. More along the lines of the Jett .46 and OS .46 timing. The displacement gives it some extra oommph to turn a bit more prop. So it can and does run well at lower rpms with "quiet" props, when combined with a properly tunned full-side pipe. It will be much better off with a full sized pipe, or a broader-band tuned muffler.


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Jett Engineering - Engine Mfg Support Forum Host

(in reply to 5.0Rick)
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RE: Rossi 53 - dud?? - 11/28/2007 3:08:34 PM   
5.0Rick


 

Posts: 38
Joined: 2/8/2005
From: Round Rock, TX, USA
Status: offline
quote:

ORIGINAL: bob27s

Sparing the tutorial on published HP info, can you identify where is the engine advertised as producing 2.3 HP ? Also, please note the rpm that might be suggested at which it develops that power?

you are on the right track - the "45 size" rossi mini-pipe is rather short-tuned. Needs to be propped to turn over 16,500 to function worth a hoot. Also, the o-ring style mini-pipe tends to leak at the o-ring if you to not properly support the tail of the muffler. Gas leakage past the o-ring can cause problems and inconsistant running.

The 9x8 info you have there is about in line with where it will want to run. In the air it probably comes on the pipe just about right. Something more along the lines of a 10x6 should turn up there too.

However, the 53 is bit lower timed (IIRC) than the .40 and .45 engines. More intended for the quiet euopean market. More along the lines of the Jett .46 and OS .46 timing. The displacement gives it some extra oommph to turn a bit more prop. So it can and does run well at lower rpms with "quiet" props, when combined with a properly tunned full-side pipe. It will be much better off with a full sized pipe, or a broader-band tuned muffler.

Thanks for the reply Bob. I got the HP info from SG Model Engines (where I bought it) From their site "This engine is specified for 2.3 Horse Power at 16000 RPM."

Here is the link.

http://shop.vendio.com/RossiEnginesUSA/item/950049272/index.html

I did read the pipe support info from another post and bought a pipe support from my LHS.

Can you please suggest a tuned full side pipe?

Also, is it possible to change the timing on this engine?

Thanks again,

Rick


< Message edited by 5.0Rick -- 11/28/2007 3:10:43 PM >

(in reply to bob27s)
       Post #: 14