RE: Magnum .91FS!  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Tachometer Readings >> RE: Magnum .91FS!
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RE: Magnum .91FS! - 11/28/2006 7:48:17 PM   
asmund


 

Posts: 1941
Joined: 11/20/2005
From: Floroe, NORWAY
Status: offline 		Rich is rich. If you drop the peak rpm by 3-400 rpm on the needle you are running rich no matter how much or little smoke it develops. Not all engines smoke like steamers and I guess type of fuel used will also greatly affect that. It seems like about 10000 rpm on master k-series 14-6 is what you should expect on a good running mag 91, I get 10200 rpm peak

< Message edited by asmund -- 11/29/2006 4:49:33 PM >

(in reply to Team_Monkey)
       Post #: 26

RE: Magnum .91FS! - 12/17/2006 4:29:31 AM   
chashint


 

Posts: 955
Joined: 1/1/2002
From: Rowlett, TX, USA
Status: offline 		I have 2 Magnum 91 fs and they both turn an APC 14x6 at 10300 - 10500 (sustained, not peak) on Morgan 15% nitro all synthetic oil.
I also have an OS 91 Surpass with the same prop and fuel that turns 10200 sustained. All the engines idle and transition perfectly and are very reliable. ~500ft and its always 80 - 105 degrees.

_____________________________

regards,
Charlie

(in reply to asmund)
       Post #: 27

RE: Magnum .91FS! - 1/21/2007 10:41:43 PM   
jbracing


 

Posts: 70
Joined: 10/26/2004
From: waverly, IA, USA
Status: offline 		9400 with MA 13x8, wildcat 15%, 26Deg F, 1000ft ASL. olnly about a 1/4 gal run through it.

(in reply to chashint)
       Post #: 28

RE: Magnum .91FS! - 1/22/2007 1:57:25 AM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline 		I just picked up another Magnum 91 FS. I hope I can turn a 15x6 @ 10000 rpm on 30% nitro. It will be just what my UCD 60.

_____________________________

E_Total = M*G*H + 1/2 M*V^2
When H=0, all of airplane's velocity becomes crash energy!

(in reply to jbracing)
       Post #: 29

RE: Magnum .91FS! - 1/22/2007 5:59:01 AM   
chevy43


 

Posts: 1023
Joined: 6/9/2006
From: Santa Cruz, CA, USA
Status: offline 		I just ordered one from Tower.

I get 10K on a 14x6 MAS K on my OS FS 91 at sea level and cool weather.

(in reply to seanychen)
       Post #: 30

RE: Magnum .91FS! - 2/21/2007 2:17:48 AM   
chashint


 

Posts: 955
Joined: 1/1/2002
From: Rowlett, TX, USA
Status: offline 		I just ran three tanks through a new Magnum 91 on Sunday.
No problems at all.
I did not peak the engine and I won't for a while.
Since it is on a PT-60 it may run with this needle setting for a very long time.
9200 RPM sustained with MA 14x6 & 15% fuel, the engine is running very rich but it is steady and the transition from low to high is very good.
I am going to fly the plane tomorrow, I may lean it out some more to see what it will really do.

< Message edited by chashint -- 2/21/2007 4:16:15 AM >

_____________________________

regards,
Charlie

(in reply to chevy43)
       Post #: 31

RE: Magnum .91FS! - 2/21/2007 6:02:25 PM   
asmund


 

Posts: 1941
Joined: 11/20/2005
From: Floroe, NORWAY
Status: offline 		I taced my SC 91 fs the other day in cold weather, MAS-K series 14-6 on 15%, 10300 rpm steady. Muffler drilled to 8mm and one headshim removed.

(in reply to chashint)
       Post #: 32

RE: Magnum .91FS! - 2/2/2008 6:02:47 AM   
chashint


 

Posts: 955
Joined: 1/1/2002
From: Rowlett, TX, USA
Status: offline 		Well I now have a Magnum 91 that only turns 9000 with Apc 14x6 on 15% fuel. Not sure why this one is different. It runs perfectly but it is >1k off what the others do. I may have to check the valves and see if they need to be adjusted.

_____________________________

regards,
Charlie

(in reply to asmund)
       Post #: 33

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