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    Briggs vanguard conversions

    if you guys really want to look into starter/altenator combos look at the skidoo snowmobiles. they have a setup where they are combined into one with a capacitor setup instead of a battery. the capacitor holds a charge for something like an hour after you shut off the motor. it's made to be...
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    What engine would YOU build

    the drone motors made somewhere in the 50-60hp range at 4100rpm if I remember correctly. they swung a pretty small prop on a drone setup to fly at 200mph but also weighed less than 250lbs. I don't see them being a great engine for a plane unless you could swing something a little larger. if I...
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    "Micromaster"-- Centerline twin using small industrial engines

    not all, but many. IMO it seems the aircraft that have the "remain airborne during engine out" goal tend to be the worst in those regards. I was talking more in terms of performance and efficiency than cost. in a light craft where weight makes a large difference in performance you are adding a...
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    "Micromaster"-- Centerline twin using small industrial engines

    possibly but that wasn't the case for the original skymaster, the saying was that the second engine was only to get you to the ground. Plus what expense is there during normal flight modes?? we are having a discussion at this point on how to make the thing even continue to fly once the other...
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    "Micromaster"-- Centerline twin using small industrial engines

    I know a lot of things on this forum tend to be academic and "how would we go about solving this impractical problem" scenarios but... this seems like a really impractical one. we are talking about an already fairly heavy industrial engine that makes low hp.... we are then trying to make two of...
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    What engine would YOU build

    yup, pretty sure that was it. claimed 100hp at 2900rpm... couple things that may be a little sketchy on that one though.... they have that thing bumped out to 175cubes. huge vw engine. their mag case (which is actually aluminum in the pictures they show, very different color) with a whopping...
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    What engine would YOU build

    wasn't there someone in south america I think that built and was testing a set of heads they made specifically for aircraft use?? did a quick google search but cant seem to find it. this would have been a couple years back. they do list "gross" hp.. which is amusing given that they are...
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    LS-3 Powered Velocity

    has anyone run the numbers on a turbocharged LS engine direct drive?? IMO this would be the best option of all. I would imagine a smallish single turbo setup could be designed to be optimized for under 3k rpm and hit the HP target. weight could be similar to or less than the reduction drive...
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    Are two-strokes worth a second look?

    not many 800cc etecs running that many miles. the crank bearings are the weak link imo. they seem to have gotten many of the bugs worked out but the introduction of the sealed bearing crankshaft did not go smoothly for them. Ski-doo motors (especially the 800) were getting new short blocks so...
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    Are two-strokes worth a second look?

    the snowmobile motor I reference is quite reliable. not saying I would want to hold it at peak power for more than a couple minutes at a time but IMO these new EFI engines are far and a way more easy to operate. no choke, no primer, no gas sitting in a carb to gum up jets. self adjusting...
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    Are two-strokes worth a second look?

    not really a fair statement. snowmobiling is big in many states. all of new england and when you get into the central US the snow dips further south. two stroke snowmobiles are still huge. two stroke outboards are still pretty big too. has anyone looked at a evinrude outboard for a two stroke...
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    Opener BlackFly

    in regards to the bold, the gyros are what controls the pitch and roll on this plane. as long as the motor is disabled in some way the gyro works with inputs from the control stick to keep the plane level regardless. It should be a nearly instantaneous reaction to the loss of power.
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    Just talking about VWs

    given cam specs, RPM range and cylinder volume the CFM requirement can be calculated easily. also runner length to tune the torque curve can be set.
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    Just talking about VWs

    does anyone put oil sprayers for the valves on aircraft vw's??? this helps pull the heat out of the valvetrain. We used them on our race motors.
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    Opener BlackFly

    it does depend heavily on failure mode. The most common critical failure I would expect with a vehicle of this type would be something like a bird strike where it manages to take out BOTH rotors on one wing. what happens to the flight characteristics in this scenario. as this is not a 100%...
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