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Ducati SS
Joined: 15 Oct 2009
Posts: 93
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 Posted: Mon Oct 19, 2009 8:31 am Post subject: Firefly prop |
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I am new to this list, and in the final stages of building a Firefly. I am using a 3 blade Ivoprop. I expect to start and break in the engine in the next week or so. What would be a good initial setting. I know I will need to fine tune it later but I would like to have a reasonable load on the engine at start up. Standard Firefly engine gearbox package.
Tom
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Mon Oct 19, 2009 10:33 am Post subject: Re: Firefly prop |
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Do not prop for full RPM on the ground, if you do your EGT's will most likely be too high. My setting for a 447 on the ground is around 6100 - 6200 RPM. If you look at the power curve, you get very little more power at higher RPM's and just shorten the life of the engine hugely by trying to get every last HP out of it by running a high RPM...
Mike
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"NO FEAR" - If you have no fear you did not go as fast as you could have !!!
Kolb MK-III Xtra, 912-S |
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Ducati SS
Joined: 15 Oct 2009
Posts: 93
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| Posted: Thu Oct 22, 2009 5:46 am Post subject: Re: Firefly prop |
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Thank you - I am aware of those factors, I thought someone might have the same combination and be able to provide # of turns on the adjuster or degrees of pitch. I would like to go as quickly as possible into the break in without multiple starts and stops to set the prop.
I do plan to avoid very high RPM use, I was planning to pull the engine apart prior to flying to improve midrange performance but other projects may prevent that for now.
Tom
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