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RE: O.S. 55AX thread - 2/22/2008 6:17:53 PM   
mrbigg



Posts: 2789
Joined: 10/30/2004
From: Streator, IL, USA
Status: offline
quote:

ORIGINAL: bob27s

MrBigg...

The standard Jett-Stream .46 size muffler, JS-40-TT (OS/TT bolt pattern).

I have been playing with the OS55 a bit myself. VERY nice engine. Dub has found that it runs well too.

Our test data is pretty much in line with what Ed found in his OS55/Jett combo. The engine has been impressive.

Key I found is the engine runs at its best when propped to run between 13,500 and 15,000 peak ground rpm (with the stock muffler, or the jett muffler). It runs ok loaded down a bit more, but this is the rpm band where it seems to develop its best power. Does run ok with the stock muffler when loaded down a bit more, and fuel delivery does not seem to be an issue.

Thanks Bob.

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       Post #: 26

RE: O.S. 55AX thread - 2/23/2008 10:26:21 PM   
kbear



Posts: 295
Joined: 9/11/2004
From: Denton, TX, USA
Status: offline 		I just bought my first OS 55 AX today. What is the general consensus for those of you flying 3D, leave the baffle in the muffler or take it out? Sounds like 13x4 wood is the prop of choice. Has anyone been running the 13x4 wide APC?

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       Post #: 27

RE: O.S. 55AX thread - 2/24/2008 12:59:55 AM   
patzane


 

Posts: 587
Joined: 11/11/2005
From: Glendale, AZ, USA
Status: offline 		I have a OS 91 and 55. Both with the stock muffler. If I remove the baffle would that increase the RPM and little.


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RE: O.S. 55AX thread - 2/24/2008 3:05:29 AM   
Goinstraightup



Posts: 2147
Joined: 12/10/2002
From: Baraboo , WI, USA
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quote:

ORIGINAL: patzane

If I remove the baffle would that increase the RPM and little.


Yes, you get more RPM. Also, you get more sound level. I don't know if that is a problem at your field or not. If not and the sound doesn't bother you, I would run it without the baffle.

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       Post #: 29

RE: O.S. 55AX thread - 2/24/2008 3:23:55 AM   
patzane


 

Posts: 587
Joined: 11/11/2005
From: Glendale, AZ, USA
Status: offline 		I will try it out yes we do have a sound restricts of 100 db


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       Post #: 30

RE: O.S. 55AX thread - 2/24/2008 3:27:53 AM   
w8ye



Posts: 17301
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: online 		Fuel draw is slightly reduced by removing the baffle. You will need to readjust the needle valve

< Message edited by w8ye -- 2/25/2008 4:19:33 AM >

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       Post #: 31

RE: O.S. 55AX thread - 2/25/2008 4:18:04 AM   
patzane


 

Posts: 587
Joined: 11/11/2005
From: Glendale, AZ, USA
Status: offline 		thats no problem


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       Post #: 32

RE: O.S. 55AX thread - 2/26/2008 2:38:20 AM   
JDXX


 

Posts: 72
Joined: 10/20/2007
From: Fort Bragg, CA, USA
Status: offline 		I fired up the 55 on the stand today.

WOW, this thing runs awsume.
I did the run in per the manual,on YS 20/20 and ran three more tanks pretty rich, though I leaned it out a bit a few times and had it spinning a apc 12.25x3.75 over 13,000 with plenty more to give. Transitions are pretty smooth allready. I did lean the mix scew 1/4 turn after three tanks though.

I cant wait to fly this bad boy

JDXX

< Message edited by JDXX -- 2/26/2008 3:07:30 AM >

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       Post #: 33

RE: O.S. 55AX thread - 2/27/2008 2:55:09 AM   
patzane


 

Posts: 587
Joined: 11/11/2005
From: Glendale, AZ, USA
Status: offline 		I try a 10x9 today on my vioer and id not like the speed. The 10x10 I had on before might be the best fit for the viper


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       Post #: 34

RE: O.S. 55AX thread - 3/1/2008 11:50:18 AM   
AE4NR


 

Posts: 32
Joined: 9/2/2006
From: Boomer, NC, USA
Status: offline 		I was looking to install a Pitts syle muffler on my 55 ax any one tried this ? If so what were your results ?
I am using the 55 on a CMPpro yak 54 about 5 lbs flying weight pushing a 12x7 prop planning on switching to a 13x4 after about another half gallon of fuel. I am looking to keep my cowl from getting cut up a bunch for the muffler. Hench the question on the Pitts or Slimline or Tat muffler

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RE: O.S. 55AX thread - 3/11/2008 2:10:27 PM   
rainedave



Posts: 5014
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: offline 		I'm finally getting around to breaking in my 55AX.

What prop are people using for break in?

I want to prop it to run above 12,000 at a rich 2-cycle setting.

Thanks,
David

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       Post #: 36

RE: O.S. 55AX thread - 3/12/2008 2:34:22 AM   
Jeep Jockey


 

Posts: 15
Joined: 3/9/2008
From: Wynyard, SK, CANADA
Status: offline 		I have also just purchased one of these motors. Any suggestions for break in......I'm going to run the OS on my Tiger II. I don't have a break in stand so will have to do it on the plane. Also any suggestions on fuel choice and prop size??

thanks

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       Post #: 37

RE: O.S. 55AX thread - 3/12/2008 7:44:17 AM   
DarZeelon



Posts: 6978
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline
quote:

ORIGINAL: Jeep Jockey

...I don't have a break in stand so will have to do it on the plane.



JJ,


Please go to Richmond R/C... and buy one of these elaborate and inexpensive test stands!

It should likely serve all your purposes forever...


Break-in on your plane is less safe and can create problems that would be hard to diagnose.



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       Post #: 38

RE: O.S. 55AX thread - 3/12/2008 5:39:02 PM   
rainedave



Posts: 5014
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: offline 		After searching the forum for AX55 and 55AX and finding no info on a recommended break-in prop, I went with a wooden Zinger Pro 11x6. I've stopped using APC's for breaking in engines on the stand because I like to hand start new engines to get a feel for their starting characteristics. New engines can kick and even stick at TDC and I have enough slices in my fingers from using APC's. Wooden prop bites can sting, but they don't draw blood. We all know how glow fuel feels in a fresh cut.

Mine started on the first flip and I immediately went to WOT and turned in the HSNV to a rich 2-cycle setting. I only had time for three 3-minute runs and on the third run I pinched the fuel tubing about every ten seconds to rev it up for a few seconds. I will slowly turn the HSNV in on the next few tanks, continuing to pinch the fuel tubing to be sure I'm not going too lean.

I was surprised at how smooth and steady it ran out of the box. I think it will only take about a total of three 8oz tanks before I can mount it in my GP Venus.

David

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       Post #: 39

RE: O.S. 55AX thread - 3/16/2008 5:22:36 AM   
patzane


 

Posts: 587
Joined: 11/11/2005
From: Glendale, AZ, USA
Status: offline 		I started with a 10x10 on break in and still using the same prop as this motor is on my GP Viper 500


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