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US 41 Engine Question - 6/20/2008 3:38:17 AM   
P51MustangKing


 

Posts: 8
Joined: 1/29/2007
From: Yorkville, IL, USA
Status: offline 		Just put this engine in my new 1/5 scale top flite p-51 and am really new to gas engines. What is the gas/oil mix ratio for the engine? I just want to make sure I put the right amount of oil in. Thanks in advance.
       Post #: 1

RE: US 41 Engine Question - 6/20/2008 1:19:26 PM   
tromb


 

Posts: 31
Joined: 11/24/2007
From: Louisville, KY, USA
Status: offline 		32:1 good quality oil.
Homelite, craftsman,Pennzoil any will do.
A little bottle/gallon and go fly.
Too many sleepless nights around this forum about 1 or 2 % oil
Screw-it
They are in the end just toys

(in reply to P51MustangKing)
       Post #: 2

RE: US 41 Engine Question - 6/20/2008 2:28:02 PM   
mogman


 

Posts: 181
Joined: 1/25/2006
From: Pitt Meadows, BC, CANADA
Status: offline 		I've got Q42's..same as US 41.. for 15+ years using 40:1 mineral..can't wear them out.

(in reply to tromb)
       Post #: 3

RE: US 41 Engine Question - 6/20/2008 3:07:33 PM   
gboulton



Posts: 1862
Joined: 5/28/2005
From: La Vergne, TN, USA
Status: offline 		Agreed on the oil comments above.

Off topic, however, I'd LOVE to know how the Mustang flies on that engine. Building one right now, and considering a US41 in the nose.

_____________________________

The free man will ask neither what his country can do for him nor what he can do for his country. - Milton Friedman

(in reply to mogman)
       Post #: 4

RE: US 41 Engine Question - 6/20/2008 5:37:36 PM   
P51MustangKing


 

Posts: 8
Joined: 1/29/2007
From: Yorkville, IL, USA
Status: offline 		Thanks guys

Haven't flown it yet, and actually am trying to sell it in the classifieds.

(in reply to gboulton)
       Post #: 5

RE: US 41 Engine Question - 6/20/2008 9:09:03 PM   
eugene


 

Posts: 572
Joined: 6/5/2002
From: Indiana| USA, IN, USA
Status: offline

I Flew that set up for a while.....US41-Q42, close, but not a clone.......A dependable plodder, on 32-1 will run long after you tire of it...I used a Menz 19.5X10 and it flew the plane at 21#. It fits good inside the cowl.....However...........if you are looking for something that will rip like a Mustang, I would suggest more muscle on the firewall.. Many good 45-50cc engines on the market in that price range, with more punch........

(in reply to gboulton)
       Post #: 6

RE: US 41 Engine Question - 6/20/2008 9:35:48 PM   
gboulton



Posts: 1862
Joined: 5/28/2005
From: La Vergne, TN, USA
Status: offline
quote:

ORIGINAL: eugene
I Flew that set up for a while.....US41-Q42, close, but not a clone.......A dependable plodder, on 32-1 will run long after you tire of it...I used a Menz 19.5X10 and it flew the plane at 21#. It fits good inside the cowl.....However...........if you are looking for something that will rip like a Mustang, I would suggest more muscle on the firewall.. Many good 45-50cc engines on the market in that price range, with more punch........


I had similar experience with the 41 in my giant Aeromaster. It's a rock solid reliable workhorse.

The statement that it fits in the cowl is precisely why I'm considering it. This will be a scale effort, and I REALLY want to avoid bits hanging out. *heh*. I've got a DL-50 laying around as well (in fact, it's in the aeromaster NOW, as the 41 has been pulled in preparation for all of this). I'd love to use it in the Mustang, but just can't make it fit in-cowl with a "scale" exhaust. The same is true of all of the other 45-50cc engines...at least those for which scale exhaust systems are made.



_____________________________

The free man will ask neither what his country can do for him nor what he can do for his country. - Milton Friedman

(in reply to eugene)
       Post #: 7

RE: US 41 Engine Question - 6/21/2008 12:17:54 AM   
eugene


 

Posts: 572
Joined: 6/5/2002
From: Indiana| USA, IN, USA
Status: offline
You will have the top of the carb exposed on one side.......When propped correctly, the 41 will give you scale flight, if the weight is in the 21# area.. The 41 is a little heavy, but the plane is designed for a straight bolt in of the 41, and a Bennett muffler makes a clean fit.........Keep your weight within reason and give the old workhorse a try..

(in reply to gboulton)
       Post #: 8

RE: US 41 Engine Question - 6/21/2008 4:24:44 AM   
gboulton



Posts: 1862
Joined: 5/28/2005
From: La Vergne, TN, USA
Status: offline 		Thanks for the insights, eugene!

_____________________________

The free man will ask neither what his country can do for him nor what he can do for his country. - Milton Friedman

(in reply to eugene)
       Post #: 9

RE: US 41 Engine Question - 6/21/2008 4:45:01 AM   
khodges


 

Posts: 5091
Joined: 7/3/2003
From: newton, NC, USA
Status: offline
quote:

ORIGINAL: tromb

32:1 good quality oil.
Homelite, craftsman,Pennzoil any will do.

Too many sleepless nights around this forum about 1 or 2 % oil



I agree. I run my -41 at 40:1 with Klotz Techniplate synthetic. Works great.

_____________________________

Club Saito #2, WACO Brotherhood #20. What other trouble can I get into?

(in reply to tromb)
       Post #: 10

RE: US 41 Engine Question - 6/21/2008 6:07:08 PM   
Zeeb



Posts: 1843
Joined: 11/11/2004
From: Pleasant Grove, UT, USA
Status: offline
quote:

ORIGINAL: gboulton


quote:

ORIGINAL: eugene
I Flew that set up for a while.....US41-Q42, close, but not a clone.......A dependable plodder, on 32-1 will run long after you tire of it...I used a Menz 19.5X10 and it flew the plane at 21#. It fits good inside the cowl.....However...........if you are looking for something that will rip like a Mustang, I would suggest more muscle on the firewall.. Many good 45-50cc engines on the market in that price range, with more punch........


I had similar experience with the 41 in my giant Aeromaster. It's a rock solid reliable workhorse.

The statement that it fits in the cowl is precisely why I'm considering it. This will be a scale effort, and I REALLY want to avoid bits hanging out. *heh*. I've got a DL-50 laying around as well (in fact, it's in the aeromaster NOW, as the 41 has been pulled in preparation for all of this). I'd love to use it in the Mustang, but just can't make it fit in-cowl with a "scale" exhaust. The same is true of all of the other 45-50cc engines...at least those for which scale exhaust systems are made.




Well us guys who live at higher altitudes have to put more power in the nose or the thing just won't perform. There's a guy at our club who's got this model with the US 41 and it's scary in the summer. Takes the whole paved runway and struggles to get over the 8 foot high bushes that are about 80 feet from the end of the runway....

Now as for something bigger that will fit inside the cowl and have scale appearance/function, this is the PLACE!

http://www.keleo-creations.com/index.php?cPath=20_46

He's got exhaust for most of the popular gas engines in the TopFlight P-51. My brother is putting a ZDZ in his and the exhaust is really well built. Be aware that inverted Pitts type mufflers will cause you grief with a DA or ZDZ as they hit the bottom of the engine box. Keleo has a much cleaner solution and not a whole lot more money. I THINK the DL can use a DA50 exhaust?????

_____________________________

Zeeb

(in reply to gboulton)
       Post #: 11

RE: US 41 Engine Question - 6/21/2008 11:06:40 PM   
gboulton



Posts: 1862
Joined: 5/28/2005
From: La Vergne, TN, USA
Status: offline 		Keleo is, indeed, one of the places I'm looking. And yes, the DA muffler will fit the DL.

Of course, the DL won't fit in cowl, so that's a moot point.

Same is true of a majority of the engines he makes exhausts for...hence my hope to use the 41.

_____________________________

The free man will ask neither what his country can do for him nor what he can do for his country. - Milton Friedman

(in reply to Zeeb)
       Post #: 12

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