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Best speed prop for an OS rear exhaust ducted fan engine?

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Best speed prop for an OS rear exhaust ducted fan engine?

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Old 04-07-2007, 08:55 AM
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VinceY
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Default Best speed prop for an OS rear exhaust ducted fan engine?

What prop would give me the most speed on a piped OS46 ducted fan engine pulling a Lykajet? I'm running an apc 9x8 right now turning a little over 13000rpm. The turbine guys at the field think I'm going about 120mph. I'd like to go a little faster. Thanks.
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Old 04-07-2007, 10:44 AM
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Default RE: Best speed prop for an OS rear exhaust ducted fan engine?

Hi!
9x8 is way too much prop.Try a 8x6 or 8x7 APC !
13000 rpm is nothing for your engine and 120mph is not that much.

Show us pictures of your plane.
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Old 04-07-2007, 12:13 PM
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Ed Smith
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Default RE: Best speed prop for an OS rear exhaust ducted fan engine?

Does "Piped" mean a full tuned pipe or a tuned muffler? As Jaka says 13,000 is nothing, well, it is a sport engine figure. With that engine set up for pipe use and the prop sizes that Jaka recommends the rpm should be in the 20,000 + range.

Believe me, with an 8" pitch prop at 13,000 rpm you are not any where near 120mph.

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