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I would certainly check out the prop diameter reduction with Hartzell or a very knowlageable prop shop. A friend bought a cut down Hartzell prop off a Mooney, if memory serves me it was in the range you are contemplating. He sent it off the Hartzell for testing and it did OK until about 2900 or so when the harmonics started to destroy the prop. He was told by Hartzell that some if not all prop designs have a destructive harmonic which is usually well above normal operating ranges and therfore not a factor.
Since we are "experimental" unscrupulus prop vendors will sell you stuff that is not fit for production A/C. There is a lot more to prop specs than diameter.. Hope this helps.. Don Skeele A&P
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Hint 1: Fill your nose gear strut.
Hint 2: Don't taxi through any depressions.
I think I read a recommended prop to ground distance. Trouble is, I can't remember what it was. Something between six and nine inches.
Good luck -- Bill Kennedy
> To: lml@lancaironline.net
> Date: Sat, 19 Apr 2008 15:06:07 -0400
> From: air.peter@googlemail.com
> Subject: [LML] Prop diameter
>
> Hello all,
> I am building a 360 MKII and got an used Hartzell 2 blade prop, normally used for an IO360 with 76" of diameter. It is recommended to shorten it to 70" to 72".
> What arebyour experiences with prop diameters, independently of manufacturer?
> Disregarding recomendations due to engine vibrations, my biggest concern is prop clearance.
> As every inch counts for efficiency, I do not want to pay for (often) repairs after ground contact.
> Any hints (getting more clearance...) and recomendations are highly appreciated.
> Thanks in advance,
> Peter 360 MKII, 90%
>
>
> --
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