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rossi 53..UT pylon muffler.. prop jet... what prop?

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rossi 53..UT pylon muffler.. prop jet... what prop?

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Old 04-07-2008, 04:02 PM
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BigBadJon
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Default rossi 53..UT pylon muffler.. prop jet... what prop?

my rossi 53 w/ UT pylon muffler swinging a 8.8x8.75 pylon prop, will this prop and muffler work well in a prop jet that calls for 46-52 2 stroke and weighs around 5 to 6 ibs.? or what prop size should i go to that will keep in the rpm range for the muffler.. trying to avoid buying another pipe.
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Old 04-07-2008, 04:22 PM
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Mike Connor
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

That engine is strong but it and the pipe is tuned for 12,000 - 16,000 rpm. Others in this form have used 9x10 to 10x8 props. A pylon prop is a bad choice for that engine or a prop jet IMO.
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Old 04-07-2008, 05:43 PM
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

That guy with a purple patriot had REAL good results with a larger prop. I would go back and read what he did...

The engine is great, that muffler is great, but keeping it in the power band as Mike mentioned is the key. That engine does not like to spin 18K, bigger prop. lower RPM's...

Cheers!
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Old 04-07-2008, 08:11 PM
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

Here's the thread:
http://www.rcuniverse.com/forum/m_6693939/tm.htm
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Old 04-07-2008, 08:20 PM
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

Can't forget that cool video:
http://www.youtube.com/watch?v=KRIbC7_8U_0
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Old 04-08-2008, 02:38 AM
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

Hi BigBadJon :

You have a good engine IMO that must move well an airframe on the size 46-52 but I agree with Mike Connors stay away from 8" pylon prop.

I did run mine with 10x7 , 10x8 , 9x10 (factory prop) and 9x10 cut from 10x10 and shaved (all APC props) and it seems this last prop and the 10x8 is the best option to go faster ( I talking about an airframe like patriot 40 size ) , you are using UT muffler and I use full pipe , I dont know how much difference can exist but probably no too much .

BTW exactly from what airplane you are talking about ???
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Old 04-08-2008, 01:37 PM
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

Hi Hector, how are you?
Did you tested the new props on the Patriot? they improved the speed?
Please keep us informed on your progress, ok??
new videos??
Cheers
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Old 04-08-2008, 07:08 PM
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

Hey how are you my friend , I good thanks .

Yes a did test the new prop (9x10 cut from 10x10 APC ) and at the moment I suppose that it is the best option to handle the patriot , it seems that I need change the bearings again [>:] , when I did run the RPM was goes down and the engine was too hot and the mark radar was 275 kph after see that I decided ran with 10x8 again to compare and had a reference point flying in the same day and with the same conditions temp. wind etc. and again the RPM goes down (compared as normally it is ) even on the ground and the mark radar with this prop was 260 kph so that made me think that the 9x10 is the best option to go faster .

I need to order a new bearings but this time I'll ask the "ceramics ones " and after that I will see what faster it can be running the engine as it must be

And for the moment none new vid [] in fact I think I need apologize with Mike Connors because I dont show him the vid with the 9x10 yet , my brother who make the edition on video has had much work and he has not been able to edit the video , when he can I'll show it .

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Old 04-09-2008, 02:10 PM
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

Hi Hector!
Nice to hear from you. Well, sad to know that you´ll need to change bearings, because your engine appear to be new. How many flyings did you make with it (or how many hours??) ?? In general Rossi´s are almost "bullet proof"....
The comercial fuels are almost all very low on oil level, and in great part are synthetic, this could be the cause of ruinning your bearings too soon. If you need to use them( commercial fuel), i suggest you to add a good dose of castor oil to it, in order to protect your engine a little more.
Props are compromise, and the best method to evaluate them is the one that you are doing, TESTING.
Keep flying strong, and make us know about the improvements in your flyings
Cheers

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Old 04-09-2008, 03:16 PM
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Default RE: rossi 53..UT pylon muffler.. prop jet... what prop?

Well I dont know exactly how many flys or hours but the engine has been running for more than 3 years I think more than 15 hours easily....

I agree with you many comercial fuels are low on oil [:'(] and yes very probably was the cause of the damage on the bearings , I 'll follow your advice if I decide to continue using comercial fuels .

Thanks alot my friend
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