RCMF

Level 1 => IC Engines => Engine performance data => Topic started by: Erez on December 28, 2012, 07:46:35 am

Title: ASP .61 FS RPM
Post by: Erez on December 28, 2012, 07:46:35 am
I have run this engine on the bench so far per the 'usual' procedure for breaking in a ringed engine, and have accumulated a total of close to 45 minutes so far.

Engine starts immediately and runs very nicely, throttle response and idle also very nice.

I am getting now 8650-8700 RPM with a Master Airscrew WOOD 12-6 using 7% Nitro. Is this reasonable?

The engine is ready for flight (first, I'll fly it on a 40 size trainer just to see how it behaves in flight) but I want to know if I'm close to the expected performance (my first ASP). BTW a friend's tachometer shows the same RPM as my tachometer.
Title: Re: ASP .61 FS RPM
Post by: FlyinBrian on December 28, 2012, 10:34:43 am
Sounds about right, it will probably pick up a couple of hundred RPM with further running
Title: Re: ASP .61 FS RPM
Post by: Steve J on December 28, 2012, 11:32:57 am
Quote from: Erez on December 28, 2012, 07:46:35 am
I am getting now 8650-8700 RPM with a Master Airscrew WOOD 12-6 using 7% Nitro. Is this reasonable?


According to my notes, mine gives me 9000 rpm on a APC 12x6 using 5%.

Steve

Title: Re: ASP .61 FS RPM
Post by: Erez on December 28, 2012, 12:14:53 pm
Thanks! so it seems I'm close to what should be expected from this engine.

Is there any point in using more Nitro?
My LHS also offer a 12% Nitro fuel (same oil content as my current 7% fuel) at almost the same price, so I'm wondering if there's any advantage?
Title: Re: ASP .61 FS RPM
Post by: Steve J on December 28, 2012, 12:52:00 pm
I only ever use 5% nitro in my ASP's. The two strokes get 18% oil and an OS 8 plug and the four stroke gets 15% oil and an OS F. I haven't had any issues, so I haven't felt the need to experiment.

Steve
Title: Re: ASP .61 FS RPM
Post by: FlyinBrian on December 28, 2012, 13:11:49 pm
I normally use 10% nitro in my four strokes.
Title: Re: ASP .61 FS RPM
Post by: Erez on January 19, 2013, 11:45:44 am
I flew this engine for the first time today, it has already gained another 150 RPM so it seems it's getting there.
I installed it on an old trainer I keep for this kind of activities.

I was amazed how easy this engine was to start everytime and how easy it was to adjust.
Power seems about the same as a 45 two stroke engine.
The sound is really great, like the 'old' four stroke engines of many years ago.

I will now try an APC in place of the MA wood 12-6.

The idle 'sounds' right but the model will not stand still, could it be that a 2.5 Kg model is just too light for this engine at idle with a 12-6?

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