dammitman

My Feedback: (15)

i have read here that the power produced by twin engines is far less than a single cylinder engine of the same size. has this been the case for everyone? i am wondering because i am planning to use some twin cylinder engines in the near future but now, i am concerned that they may not have the power i am expecting. what is your opinion and experiences?

w8ye

My Feedback: (16)

The twin cylinder OS and ASP/Magnum 160 engines have little more power than a good 120 single cylinder engine.

rcdude7

My Feedback: (264)

Our tiny multi-cyl engines will always be at a disadvantage because of the friction from all of the extra moving parts (almost double)over a single of the same displacement. As the engine displacement increases friction becomes less of a factor between the two engine styles.
My OS 120 twin has nearly the same power as my .91 surpass despite a 1/3 increase in displacement.

w8ye

My Feedback: (16)

I have a Saito 90R-3 three cylinder radial engine. It swings a APC 13-6 prop about the same as my Saito 65.

loughbd

Due to internal friction losses small multi cylinder engines have less power than single cylinder engines of the same displacement

Cyclic Hardover

My Feedback: (3)

I'll tell this story. One of my WM 40 size P-51's has a G90 in it and it is fast. A close friend owns the WM P-82 twin with a pair of 46fx's and that plane blows my "wings" off. Same hold true on another set up. Now this same guy has (but not yet flown) that KMP P-38 with a pair of 91fx's. Should be quite a show.

JettPilot

My Feedback: (6)

The guy in the post is asking about twin CYLENDER engines versus single cylender engines. You are talking about twin engine planes, which is a different stroy alltogether. The twin cylender designs when you get this small are very inefficent. Power will be down, but there is somthing really cool about having a twin cylender engine on an RC plane

JettPilot

Cyclic Hardover

My Feedback: (3)

Oh well

stelios

My Feedback: (4)

See for yourself the peak numbers on 15% Cool Power and MA k-type 16x6 prop:

OS FT-160 gemini twin cylinder engine - 9,600 rpms

and following are the numbers of some of the best single cylinder engines:

OS FS-120 Surpass III or E - 8,700 rpms
Saito FA-120s - 9,100 rpms
YS 110 FZ - 9,600 rpms

According to the numbers if YS 110 FZ performs like an 150 sized engine then the OS FT-160 is like an 150 as well. However the big advantage of single cylinder engines is better transition.

Stelios

loughbd

A twin's "transition" is almost instantaneous. My 120, 300, and 240 four cylinder react almost as fast as I can move the throttle on the transmitter

Where did you get those "numbers".?

NM2K

My Feedback: (14)

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Especially someone elses plane when they are competing against you.

loughbd

In a scale contest?? You bet. Although judges aren't supposed to take the engine into account in judging, they always do. If you are using a two cylinder or say a five on a Fleet Biplane, the judges usually tend to grade you higher. I know I used to judge scale contests.

stelios

My Feedback: (4)

To loughbd

The numbers posted are from my own engine fleet.

Stelios

Build-n-flyer-RCU

My Feedback: (4)

My Saito 200Ti inline twin performs somewhere between a Saito 150 and 180.