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As others have stated: report prop characteristics … combined with that, what is your WOT static rpm?
Tie the tail to a tree or your truck and take the engine to WOT – you can only do this for 5-6 seconds. You have to know this static condition as it is a base-line for your engine/prop configuration. You also need to go there to ensure
everything is working (fuel delivery, engine smoothness, fluid hose connections, etc.) under simulated take-off conditions. Bring the throttle slowly but steady back to idle to ensure the engine doesn’t quit – repeat as many times as necessary for confidence-building.
Jeff
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From:
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shipchief@aol.com
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Subject:
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First Flight jitters
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Date:
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Mon, 9 Sep 2013 00:47:08 -0400 (EDT)
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To:
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flyrotary@lancaironline.net
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I've been slowly building my RV-8 with 13BT engine for about 14 years...!
On June 13th 2013 it received the coveted Airworthiness Certificate. That same day I detonated my engine due to the trailing spark plug holes being machined oversize
in an attempt to improve the single spark plug power, should the leading plug ignition fail. This, and possibly advanced ignition, and possibly over-boost detonated my engine on it's first high power taxi test. That took about 2.5 seconds.
Now I've rebuilt the engine with new unmodified rotor housings, and it runs better than ever. I've re-marked the timing marks on the pulley, and reset the timing,
though not to 4000 RPM yet. today I checked it. At 3000 RPM my hat and hearing protection blew off. 11 degrees BTDC, and 16" manifold pressure.
I've been taxiing around at modest RPM, it's great. I've consistently been idling at about 1600 RPM, (730 prop RPM) and sometimes as low as 1490, (680 Prop RPM) smoothly.
That is slow enough to keep the brakes from getting too hot.
I've done run ups and brief bursts of power to 4200 Engine RPM, (1917 Prop RPM) which is about 32" manifold pressure, and seen 37" manifold pressure briefly.
I know this is not enough power to take off, although I have done a Pre-take off to 50 MPH with this power before powering down with roll out to the end of the runway. I suppose it would fly off and maybe clear the trees at this power. I've lifted the tail,
and rocked the wings with the ailerons. It steers well and the brakes work.
The water level in the engine stays up between flights as does the oil, and the water temp today was consistent 163 F oil about 173 with the highest observed
183F. I did about 4 pre-take off passes with taxi back, with excellent temperature control and throttle response.
A couple of oil fitting were tightened looking for an oil seep.
7.3 hours engine running time on the EM2, about 2 hours since the engine overhaul.
I don't think I'm at all ready to fly this thing. I'm missing something, so offer up some advice, I'm all ears!
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