503 RPM

Technical questions, advice, sharing information etc (aircraft, engines, instruments, weather and such)
Post Reply
User avatar
soekiwindni
Woohoo 100 posts - flying high
Woohoo 100 posts - flying high
Posts: 113
Joined: Fri Oct 19, 2007 7:13 pm
Location: Kroon Airfield. (Pretoria)

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
Top
kloot piloot
Frequent Flyer
Frequent Flyer
Posts: 1499
Joined: Thu Jan 10, 2008 10:37 pm
Location: Sky @ FABS (Brits Flying Club)
Contact:
Contact kloot piloot

Re: 503 RPM

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

5900 rpm straight and level, bar nuetral at 5000 asl.
Roel Jansen
Never say: "I should have ..."
ZU-IAR powered by BMW 1200
Top
User avatar
Biggles
Pilot in Command
Pilot in Command
Posts: 770
Joined: Wed Nov 02, 2005 12:29 pm
Location: Cape Town/ Namibia
Contact:
Contact Biggles

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.

Smokin'
Trike pilot

Aerotrike Cobra
ZU-DLP

Winelands FAWN
Top
User avatar
Morph
The Big Four K
The Big Four K
Posts: 5176
Joined: Wed May 25, 2005 3:34 pm
Location: Cape Town

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
Greg Perkins
Top
User avatar
Wargames
Frequent Flyer
Frequent Flyer
Posts: 1353
Joined: Sat Jan 12, 2008 2:00 pm
Location: Morningstar, Cape Town

Re: 503 RPM

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

Hi Morph, Make it 3000 posts and get it over with!!
The Naked Trike
ZU-AVL
"I hate CIRCLIPS!!"
Top
nickjaxe
Look I'm flying
Look I'm flying
Posts: 221
Joined: Wed Oct 05, 2005 9:42 pm
Location: North Cheshire in the UK.

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.

Nick.
What a nice feeling it is being part of such a nice group of people, {Microlighters}
Top
Post Reply

Return to “Technical Talk”

Who is online

Users browsing this forum: No registered users and 3 guests