Go to a hobby shop that sells model airplanes. You can buy a perfectly accurate digital battery operated counter for $30. Does both 2 blades and 3 blades.

Tom Corcoran
Boston

-----Original Message-----
From: richard grimes <rgrimes@realtysouth.com>
To: MrLucky353@aol.com;; bac-mail@beechaeroclub.org
Sent: 29 Nov 2005 13:05:45 GMT
Subject: RE: [BAC-Mail] Sundowner full throttle RPM


Steve, sounds about fifty rpm below my 78 sundowner with 1200 hours on the
engine. You can check the accuracy with a hand held tach. Mac tools about
$100. Richard

-----Original Message-----
From: MrLucky353@aol.com
Sent: 11/28/05 6:07:33 PM
To: "bac-mail@beechaeroclub.org" <bac-mail@beechaeroclub.org>
Subject: [BAC-Mail] Sundowner full throttle RPM


Hi guys and gals, here's today's question....

I have a newly acquired 1978 Sundowner with a Lycoming O 360 A4K 180 HP
engine
turning a Sensenich 76EM8S5 0 60 prop.

Engine has 4400 hours, 100 hours since overhaul.

A) POH says takeoff power and maximum continuous power is
full throttle at 2700 RPM.

On take-off and climb with full throttle the tach only shows 2350-2400.
Straight and level full throttle tach only shows 2500.

Temperature was 58 degrees F.
Estimated weight at takeoff (just me and 40 gal fuel) 2050lbs.

Are these tach readings cause for concern?

Thanks.

Steve
N2009D

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