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Post by juergen on Jan 24, 2012 4:03:56 GMT -5
to have the weight below 500lbs with 2180cc engine is not so easy, but I work on it.
My engine is constructed for high rpms and my cruise rpm is about 3600-3800 at 22/23 inch manifold pressure
That numbers are in normal conditions at 1500ft start altitude, 4000-5000 cruise altitude and about 20°C (68°F).
The compression ration of the engine is 9.5:1
with best regards
Juergen
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Post by bobthebuilder on Jan 24, 2012 5:48:58 GMT -5
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Post by bobthebuilder on Jan 24, 2012 5:49:13 GMT -5
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Post by heisan on Jan 24, 2012 7:39:51 GMT -5
A re-drive won't fit, but it is not needed. The minimal frontal area of the Sonerai makes it possible to get very good efficiency from a small prop running at high RPM. Although I haven't confirmed that fitment will/will not work, I would like to go for the Revmaster, because: 1) we have an agent in SA, so ordering, maintenance, etc. are a breeze. 2) the price is actually pretty much the same, once you add up everything that is included in the Revmaster package. |
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4trade
Junior Member
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Post by 4trade on Jan 24, 2012 10:24:05 GMT -5
100 hp+ start to be at heavy side of VW power.
Continental O 200 weight is 180 lbs without starter, alternator and with one magneto. That engine give 100 hp/ 2750 rpm...so you can use long prop....or run 3400 rpm/ 125-130 hp
VW 80 hp direct drive 3400-3600 rpm/ 165 lbs
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Post by bobthebuilder on Jan 24, 2012 12:30:32 GMT -5
Heisan, I had a look at the Revmaster website. Do they only have one model, the R2300? That tips the scales at 170lbs and delivers 85 hp. revmasterautomotive.com/revmasteraviation/?p=308The local support is an advantage, but will it fit?  Someone must have tried this before ...... ? |
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Post by oahupilot on Jan 24, 2012 21:04:10 GMT -5
A quick note about sonerai, the propeller diameter is really limited in sonerai due to its lack of ground clearance of the stock gear. My next prop is 64 inches in diameter and will be spinning at 3700 rpm in a three blade setup in order to be able to use all 150hp of my motor. Once you start climbing the hp range getting traction out of your propeller starts to become interesting.
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Post by bobthebuilder on Jan 25, 2012 0:13:42 GMT -5
Ahhhh ..... The prop diameter. Missed that one.
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Post by pilotsailing on Jan 25, 2012 7:42:30 GMT -5
could you raise the thrust line 4 or 5 inches to get more ground clearance , and use 2 - 3 degrees up tilt on the thrust line to compensate for it ?
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4trade
Junior Member
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Post by 4trade on Jan 25, 2012 8:49:10 GMT -5
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Post by pilotsailing on Jan 25, 2012 13:08:57 GMT -5
True, but that would mean another $1200-1500 gone  plus I would need a ladder to get in the plane ;D |
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4trade
Junior Member
Posts: 51
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Post by 4trade on Jan 25, 2012 13:31:49 GMT -5
Sonerai have low landing gear anyway. You cant do three point stall landing, or you drag tail in a ground.
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Post by Schmleff on Jan 25, 2012 16:32:07 GMT -5
It would be easier to use a straight rod on the tail than to raise the gear. Try to keep the tail wheel as low as possible without hitting the rudder. For my Cassutt project I bought an untapped rod from Sonex to keep it as low as possible. If I did my Sonerai again I would do the same. Of course this does not let you run a bigger prop but it does help to slow the plane more in landing.
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Post by oahupilot on Jan 25, 2012 19:03:47 GMT -5
could you raise the thrust line 4 or 5 inches to get more ground clearance , and use 2 - 3 degrees up tilt on the thrust line to compensate for it ? That sounds like asking for host of weird problems down the development line. |
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Post by splischke on Jan 25, 2012 19:38:09 GMT -5
Sonerai have low landing gear anyway. You cant do three point stall landing, or you drag tail in a ground. Are you making this statement with respect to a Sonerai that is built to plans? I have almost 1000 landings in my IIL and have no trouble making 3 point stall landings. -Scott |
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plus I would need a ladder to get in the plane ;D
