BEST .15 FOR THE BUCK  
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BEST .15 FOR THE BUCK - 2/9/2007 5:42:43 AM   
prop planter


 

Posts: 200
Joined: 6/9/2005
From: Apache Flats, USA
Status: offline 		I'm looking to purchase a .15 2 stroke engine. I see towerhobbies offers about 5 different engines. They are 1-AP 2-magnum 3-os la 4-os cv and 5-thndr tgr gp.

What one would you recommend and what order would you rate them best to worst.

Also are there other brands out there worth looking at?

Thanks for the advice!!

< Message edited by bovan -- 2/9/2007 4:34:04 PM >

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       Post #: 1

RE: Best .15 for the BUCK - 2/9/2007 6:33:46 AM   
Flyboy Dave



Posts: 13375
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline 		I'll rate the Magnum tops....

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXAN90&P=

NOTES FROM OUR TECH DEPARTMENT
This is the XL Series 15A R/C Airplane Engine from Magnum.
This is a .15 size 2-Stroke Glow Engine, meant for Sport Flying.

FEATURES: ABC Construction
1-piece crankshaft
Front-mounted carb
Side exhaust
Schnuerle porting for better scavenging
Front and rear ball bearings
Carb features High & Low Speed needles
Muffler is expansion type

INCLUDES: One Set of Instructions
One Engine
One Carb
One Muffler w/Pressure Tap and 2-Fiber Gaskets
Two Washers (black)
Two 2.2 x 25mm Screws for bolting on muffler
Two Allen Type Wrenches
One Warranty Card (Warranty good for TWO YEARS from date of purchase)

SPECS: Bore: 15mm (.729in)
Stroke: 14mm (.668in)
Displacement: 2.47cc
Practical RPM: 3,000-18,000
Power Output: .45 bhp
Weight w/Muffler: 165g
Prop Nut size: 5mm
Length: 55.3mm (2.179in)- backplate to front of drive washer
Length: 72.9mm (2.871in)- backplate to front of crankshaft
Height: 60.08mm (2.394in)- bottom of engine to top of head
Width: 3mm (1.17in)--distance from center mounting holes
Width: 1.13" -width of crankcase neglecting mounting flanges.
Recommended Prop size: Break-In: 7x6
Normal Use: 7x6, 8x4

REQUIRES: One glow plug and fuel with 5-15% nitromethane.
____________________________________________________________

....it's a Schnuerle ported, ABC, ball bearing engine....with a twin needle (and not a
remote mounted) carb. All parts are available, less expensive than any of the others....

....and it will whoop the snot out of the others to boot.

FBD.





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A mechanic says..."Oh yeah, watch this".
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       Post #: 2

RE: Best .15 for the BUCK - 2/9/2007 1:55:39 PM   
DarZeelon



Posts: 6984
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline 		Bovan,


The MVVS .15 GFS/R can be selected as side, or rear exhaust and is in stock trim capable of over 22,000 (with a 7x4 prop).

It is a bit more expensive than the four engines you listed, together with its mini-pipe.

...But if 'bang for the buck' is what you're after, it has a lot more bang for only a little more bucks...

If you want to power a trainer, a normal silencer (or an extra quiet one) are also available.

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MVVS - Jett - Nelson - Bolly - Mejzlik

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RE: Best .15 for the BUCK - 2/9/2007 2:51:08 PM   
Sport_Pilot



Posts: 7652
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		TT .15 for the bucks. If you want more performance then a Fox .15 would be better than, say OS. Can't speak for the engines Flyboy or Dar mentioned. There are only a few .15 engines I have experiance with.

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RE: Best .15 for the BUCK - 2/9/2007 3:04:33 PM   
RCPAUL


 

Posts: 619
Joined: 12/15/2001
From: Gahanna, OH, USA
Status: offline 		The OS is a wimp. The TT is better and very easy to run (have 2). I'd go for the magnum.

Paul

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RE: Best .15 for the BUCK - 2/9/2007 3:04:43 PM   
prop planter


 

Posts: 200
Joined: 6/9/2005
From: Apache Flats, USA
Status: offline
quote:

ORIGINAL: Sport_Pilot

TT .15 for the bucks. If you want more performance then a Fox .15 would be better than, say OS. Can't speak for the engines Flyboy or Dar mentioned. There are only a few .15 engines I have experiance with.



Who deals new fox stuff? There is a local fellow that is very impressed with the output of his fox .15.

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       Post #: 6

RE: Best .15 for the BUCK - 2/9/2007 3:41:58 PM   
j.duncker



Posts: 1133
Joined: 6/22/2004
From: Where I park the RV, AK, USA
Status: offline 		For out of the box performance it is hard to beat the OS 15 CVA It likes nitro 25 -30 % and I run mine on a APC 7x5 for 12th scale RC combat.

The silencer as supplied is quite restrictive and a mousse can muffler will give more power.

However bang for buck Hmmm they are pricey.

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RE: Best .15 for the BUCK - 2/9/2007 4:03:01 PM   
Ed Cregger



Posts: 7645
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline
quote:

ORIGINAL: RCPAUL

The OS is a wimp. The TT is better and very easy to run (have 2). I'd go for the magnum.

Paul



------------


For my sport flying uses I prefer the TT and Enya SS 15 engines. No ball bearings to rust, no heavy ball bearings to lug around and a reasonable pricing.


Ed Cregger



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"Flying models since the Fifties - I'll get the hang of this yet!!!"

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RE: Best .15 for the BUCK - 2/9/2007 4:27:14 PM   
prop planter


 

Posts: 200
Joined: 6/9/2005
From: Apache Flats, USA
Status: offline 		Thanks for the advice.

OK, I'm looking at getting either the magnum, or the tt gp. Which one is the better and why?

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The plane lied/ I-CAN'T-DO-3D

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RE: Best .15 for the BUCK - 2/9/2007 4:32:09 PM   
prop planter


 

Posts: 200
Joined: 6/9/2005
From: Apache Flats, USA
Status: offline 		I read this in specs on the TT: Any problems with it?

"Precision air-bleed (single needle) carburetor makes needle valve
adjustment simple"

_____________________________

The plane lied/ I-CAN'T-DO-3D

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       Post #: 10

RE: Best .15 for the BUCK - 2/9/2007 4:54:54 PM   
DarZeelon



Posts: 6984
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline
quote:

ORIGINAL: bovan

I read this in specs on the TT: Any problems with it?

"Precision air-bleed (single needle) carburetor makes needle valve
adjustment simple"


Bovan,


The TT has a simple air-bleed carburettor, unlike the more elaborate ones in some Enya engines, for example.

This means fuel is not metered and the air-bleed closely controls the mixture strength at idle only.
There is no 'fuel curve' as such, for part throttle mixture control.

This is a minor limitation. The MVVS also has an air-bleed carburettor.



_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - Nelson - Bolly - Mejzlik

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RE: BEST .15 FOR THE BUCK - 2/9/2007 5:06:31 PM   
prop planter


 

Posts: 200
Joined: 6/9/2005
From: Apache Flats, USA
Status: offline 		Is that to say that the low end is the only adjustable range?

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The plane lied/ I-CAN'T-DO-3D

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RE: BEST .15 FOR THE BUCK - 2/9/2007 5:27:37 PM   
HighPlains


 

Posts: 2640
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		This is a question that I have wondered about for some time.

The engine on your list that I drool over is the OS .15 CV, but at $110 it would be a bit much for a twin engine Goldberg Skylark that I would like to build.

The AP engines are reported to have about zero power, which is too bad, because they are kind of cute, especially the .09 with the rear exhaust and BB.

The OS LA and the TT 15 are both bushing engines. Really nothing wrong with bushings, that how my Corvette engine is built, but I do like the BB engines. The TT stuff seems very well made. OS has been at this for a long time too. It's a Ford or Chevy.

The magnum looks good on paper. Power almost like the OS CV. But I have seen poor examples of their stuff in the past. I don't know whether to say it was a modeler that was a hack, or the engine, or the fuel he was using. They used to run a full page ad with a picture of a guy looking through an unassembled case with the caption "our perfection is boring". What made this a laugh was the tool chattering marks where they machined the case for the rear cover. Who knows where they are with todays stuff? Can't trust marketing anyway, it's their nature.

The MVVS sounds good if you want to spin a small prop at high rpm's. My Nelson .15 is that way too, turning 25K on a 6-5. But not the engine for most airplanes where you need a 7-5 or 8-4 to match the airframe drag.

It's not likely to get any better in the .15 size, I doubt you will see very much new development in this size. Electrics will see to that, and they will be pushing the .40's on all fronts in a very few years.

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       Post #: 13

RE: BEST .15 FOR THE BUCK - 2/9/2007 5:39:28 PM   
DarZeelon



Posts: 6984
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: offline
quote:

ORIGINAL: bovan

Is that to say that the low end is the only adjustable range?



No, Bovan.


The very top is adjustable for mixture strength, by the high-speed needle and the idle mixture is adjustable by the air-bleed screw.

It is the mid-range that has no form of fuel-metering and will typically run a bit too rich.



_____________________________

Dar Zeelon - ISRAEL - ddzeelon@gmail.com
MVVS - Jett - Nelson - Bolly - Mejzlik

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