RE: Magnum XLS-52  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       


O.S. Engines O.S. FS-120 III Surpass (Pump)
Seller:  RCadmin
Details:   $350.00   |  8/25/2008   |  Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: Magnum XLS-52
Page: <<   < prev  1 2 [3] 4 5 6 7   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: Magnum XLS-52 - 3/30/2004 3:44:41 AM   
Spoon-RCU



Posts: 52
Joined: 7/25/2003
From: Wake Forest, NC, USA
Status: offline 		Ok. You guys really make me like this engine. I haven't got an answer yet in the U-Can-Do threads....so, how do you think this engine matches up with the .46 UCD? By-the-way, the .52 is on sale for 79.99! Sounds like a good $ to fun ratio to me.

Spoon

(in reply to jcflysrc)
       Post #: 51

RE: Magnum XLS-52 - 3/30/2004 1:28:22 PM   
SMALLFLY-



Posts: 2150
Joined: 12/9/2001
From: Evansville, IN, USA
Status: offline 		I am really liking mine. The review stated the mag 52 put out 8 lbs of thrust. 8 lbs, on a 4.5 lb fun fly.. outrageous good time. I drilled my muffler and removed the baffle as well to get some more RPM'S, You can gain around another 800 rpm by going to a tower muffler.
For 80 bucks I might buy another just to have as a backup

< Message edited by smallfly-RCU -- 3/30/2004 8:30:48 AM >

(in reply to Spoon-RCU)
       Post #: 52

RE: <span class= - 3/30/2004 5:18:32 PM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline 		My Magnum 52 XLS is starting to go south on me. The throttle arm on the carb barrel collar is falling loose. This metal arm bracket is staked to the barrel collar, and I guess the over-travel I impose on this assembly from having to shut down the motor eventually worked the staking loose. I got around it by replacing the little M3 screw that secure the barrel collar to the main barrel with a long M3 screw and make it a control arm instead.

I still have a lousy mid-range. I can get it to run fine full throttle and idle reliably for extended period of time. But if I stay at 1/4 ~ 1/3 throttle too long, it will still cough upon throttling up. I can have a not-rich top speed and not-rich idle, and still mid range is slobbering rich, as verified by the pinch test. I guess it is a good engine for anything other than 3D, where we spend most of the time in mid-range. I will just pull this out of my CG Edge profile and put it onto my GP Stick.

(in reply to SMALLFLY-)
       Post #: 53

RE: <span class= - 3/30/2004 8:40:02 PM   
SwampFlier-RCU



Posts: 1064
Joined: 1/22/2002
From: La CeibaAtlantida, HONDURAS
Status: offline 		Seany.. have you adjusted the low speed needle valve on your Magnum?? Looks to me as if you have a mid rabge prblem.. the high speed needel only effects wide open throttle operation, while the low needele affects idle and midrange


_____________________________

Regards,
Patrick

(in reply to seanychen)
       Post #: 54

RE: <span class= - 3/31/2004 4:25:26 AM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline 		I adjusted the low needle as fine as I can. It's only like 1 turn from fully closed.

(in reply to SwampFlier-RCU)
       Post #: 55

RE: <span class= - 3/31/2004 11:51:49 AM   
coomarlin



Posts: 1001
Joined: 10/2/2002
From: Morgantown, WV, USA
Status: offline 		I just ordered a 52 and I'm wondering if anyone is using the remote needle valve on this engine. I'm normally not a big fan od RNV's, but I'm wondering what you guys think?

_____________________________

Windy Ridge RC Club

(in reply to seanychen)
       Post #: 56

RE: <span class= - 3/31/2004 4:25:41 PM   
blvdbuzzard



Posts: 1438
Joined: 6/16/2002
From: boulevard, CA, USA
Status: offline 		seanychen, on my 52 the low speed is at 3/4 of a turn out. The needles can be a little tricky because of the steep tapper on them. A little adjustment can make a big differance in the settings. Mine are very touchy. On the low end I adjust it 1/16 of a turn and it makes a big differance.

Dru.

(in reply to coomarlin)
       Post #: 57

RE: <span class= - 3/31/2004 8:56:55 PM   
Ernie Misner


 

Posts: 3154
Joined: 7/5/2002
From: Tacoma, WA, USA
Status: offline 		blvdbuzzard, are you saying that by getting the low end set just right, that you have excellent transition on your .52? I am hoping this is the case because I have heard a few fellows now say that they can't get a decent transition due to a rich spot or coughing at midrange. I'll be getting mine in the air soon and want to know.k

Ernie

(in reply to blvdbuzzard)
       Post #: 58

RE: <span class= - 3/31/2004 11:39:05 PM   
blvdbuzzard



Posts: 1438
Joined: 6/16/2002
From: boulevard, CA, USA
Status: offline 		I have a real good transition from any throttle setting. It took me a while to get the low end set. After I got it set I have had a good transition. Just watch how big of an adjustment you do, a littile one goes a long way. If you still can not get a good transition try a four stroke plug and see how hat helps.

Dru.

(in reply to Ernie Misner)
       Post #: 59

RE: <span class= - 4/1/2004 9:00:35 PM   
Ernie Misner


 

Posts: 3154
Joined: 7/5/2002
From: Tacoma, WA, USA
Status: offline 		Thanks for the info Dru. How does an OS #8 (or Tower plug?) and 15% fuel (with some castor) sound? 11x6 prop for sport use?

Ernie

(in reply to blvdbuzzard)
       Post #: 60

RE: <span class= - 4/1/2004 9:18:57 PM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline 		Mine low end needle is a little less than 1 turn from fully closed now that I think about it. I have been fine tuning this adjustment at 1/16 increments like you said. My current setting has a pretty good prolonged idle and good transition after that. But like I mentioned above the problem is at the midrange, which I cannot control. If I have a prolonged 1/4 throttle, which is what happens when you harrier for a while, it will hesitate for a second upon throttling up. If I make it 1/16 turn leaner, I am sure the mid range will be better, but throttling up after prolonged idle will cough a little, which I think is a sign of lean idle.

I think a higher carb position to fuel tank will help this rich midrange at level flight. My engine was mounted sideway, and fuel tank waterline is higher than carb when the tank is full. I just pulled the engine onto my GP Stick, and it's mounted upright, so the carb is always well above the tank. I will see if it makes any difference when I run it hopefully soon.

It just doesn't help to have an iffy transition when I am hovering/harriering 10 ft above ground. I've bent the stock LG of the Profile Edge a few times because of deadsticks. I just don't need this kind of worry anymore. Maybe those of you with good luck w/ your Magnum 52 got a "newer" version with an improved idle screw shape.

Magnum usually does a pretty good job when the engine is direct copy from OS. I absolute love their 91 4-stroke and 91 2-stroke (well, the 2-stroke is ABC instead of OS's ABN, and carb is not the infamous 91 FX air leak remote NV design). Maybe this 52 is not a copied proven OS carb design, and thus we see some problems.

(in reply to Ernie Misner)
       Post #: 61

RE: <span class= - 4/1/2004 11:50:28 PM   
blvdbuzzard



Posts: 1438
Joined: 6/16/2002
From: boulevard, CA, USA
Status: offline 		Right now I am running the Thunder Bolt Fs plug and it works pretty good. I have not had much luck with O.S. plugs, so I don't run them any more. The best plug I have run is the Enya #3. I have run the Fox Miricle plug for a long time now and it works well too. The fuel I am running is Power MAster 15% and 18% oil. It is a castor and synthetic blend.

Dru.

(in reply to Ernie Misner)
       Post #: 62

RE: <span class= - 4/2/2004 4:22:31 AM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline 		Oh, I forgot to mention, I am using Tower 46 muffler. It gives more power, but does make tuning rougher. I broke the stock muffler by over-tightening it. Otherwise I am sure I can find a satisfactory setting w/ the stock muffler.

(in reply to blvdbuzzard)
       Post #: 63

RE: <span class= - 4/2/2004 9:08:20 PM   
Ernie Misner


 

Posts: 3154
Joined: 7/5/2002
From: Tacoma, WA, USA
Status: offline 		<<<.Oh, I forgot to mention, I am using Tower 46 muffler. It gives more power, but does make tuning rougher.......

I have heard that before. Usually it is mentioned that the lack of baffle and backpressure will cause underpressurizing the tank, and I would think that would make for a leaner midrange, but maybe you are running slightly richer at idle to compensate for backpressure..... then it actually goes RICHER at midrange.

Magnum mufflers seem to be dirt cheap. Getting a new one might salvage that engine instead of putting it out to pasture on a sport plane.

Ernie

(in reply to seanychen)
       Post #: 64

RE: <span class= - 4/12/2004 5:24:00 AM   
blvdbuzzard