503 RPM

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soekiwindni
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503 RPM

Postby soekiwindni » Thu Jun 05, 2008 7:33 pm

What would the ideal RPM setting be for a 503 cruising straight and level at +/- 50 miles/h? Is 5800 rpm too high?

My engine goes up to 6900rpm at full throttle.... any problems with that?

thanks
Jodie
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kloot piloot
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Re: 503 RPM

Postby kloot piloot » Thu Jun 05, 2008 9:05 pm

5900 rpm straight and level, bar nuetral at 5000 asl.
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Biggles
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Re: 503 RPM

Postby Biggles » Thu Jun 05, 2008 10:38 pm

5000 straight and level at 1500ft ASL one up. Take off it revs up to a smidgen below the red, 6900. That is with the three bladed AEROS prop.

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Morph
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Re: 503 RPM

Postby Morph » Thu Jun 05, 2008 11:43 pm

soekiwindni wrote:What would the ideal RPM setting be for a 503 cruising straight and level at +/- 50 miles/h? Is 5800 rpm too high?

My engine goes up to 6900rpm at full throttle.... any problems with that?

thanks
Jodie
Yes, you are overreving the motor. Max rpm for 5 minutes is 6800. Max cruise RPM is 6500

The pitch of your prop blade is slightly low or you have a smaller prop, or your rpm guage is not reading correctly.

I would say your plane climbs great but obviously suffers on the cruise.

You want to cruise at 75% power which is about 5500 max
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Re: 503 RPM

Postby Wargames » Thu Jun 05, 2008 11:55 pm

Hi Morph, Make it 3000 posts and get it over with!!
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Re: 503 RPM

Postby nickjaxe » Wed Jun 11, 2008 10:34 pm

I have found the tachs that run off the 503 motor can be way out, i set mine up with a hand held laser type.

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