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170cm 67" propeller on a trigear

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Olivier.hequet@neuf.fr

Joined: 21 Aug 2017
Posts: 40
Location: France

Posted: Thu Sep 07, 2017 7:53 am Post subject: 170cm 67" propeller on a trigear

Hello,

currently I have a 62 "warpdrive propeller on a trigear and I will change to an e-props. The distance between my current propeller and the ground is currently 30.5cm (12"). it is advisable to put a propeller of 170cm in diameter (67 "), in this case, there should be 24cm (9.4") between the ground and the propeller. do you think this calculation is correct or is it better to take a diameter 165cm (65 ")?

Thanks



Olivier

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JohnFrance

Joined: 17 Sep 2014
Posts: 77
Location: Grenoble France

Posted: Fri Sep 08, 2017 1:21 am Post subject: Re: 170cm 67" propeller on a trigear

Hi Olivier,

I have an Eprops Durandel 80S which is 1.6 m diameter on my mono-wheel using a 912 UL. That is already slightly bigger than the Warp drive 62". I did consider a bigger prop but was advised against it.

I assume you have a 912ULS on a tri gear so you would require the Durandel 100 S.

The propeller should not be able to contact the ground with the front tyre flat and the leg fully compressed you will need to find the relevant FAR's

Do you need any information for the DGAC acceptance paperwork as I can supply a template?

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Olivier.hequet@neuf.fr

Joined: 21 Aug 2017
Posts: 40
Location: France

Posted: Fri Sep 08, 2017 3:14 am Post subject: Re: 170cm 67" propeller on a trigear

Hello John



If you could provide me with the DGAC documents, I would be delighted.



Thanks

Olivier olivier.hequet (at)neuf.fr

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Nigel Graham

Joined: 23 Mar 2017
Posts: 36
Location: Winchester - UK

Posted: Fri Sep 08, 2017 7:37 am Post subject: Re: 170cm 67" propeller on a trigear

Not sure which standard your aircraft needs to comply with, but CS-VLA contains some "common sense" advice on propeller clearance.

CS-VLA 925 Propeller clearance

 Unless smaller clearances are substantiated,

propeller clearances with the aeroplane at

maximum weight, with the most adverse centre

of gravity, and with the propeller in the most

adverse pitch position, may not be less than the

following:

(a) Ground clearance. There must be a

clearance of at least 180 mm (for each aeroplane

with nose wheel landing gear) or 230 mm (for

each aeroplane with tail wheel landing gear)

between each propeller and the ground with the

landing gear statically deflected and in the level,

normal take-off, or taxying attitude, whichever is

most critical. In addition, for each aeroplane

with conventional landing gear struts using fluid

or mechanical means for absorbing landing

shocks, there must be positive clearance between

the propeller and the ground in the level take-off

attitude with the critical tyre completely deflated

and the corresponding landing gear strut

bottomed. Positive clearance for aeroplanes

using leaf spring struts is shown with a

deflection corresponding to 1·5 g. 



The complete document can be found here:

https://www.easa.europa.eu/system/files/dfu/CS-VLA%20%20Amdt%201%20combined.pdf



Hope that is of some use to you.



Nigel

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Olivier.hequet@neuf.fr

Joined: 21 Aug 2017
Posts: 40
Location: France

Posted: Fri Sep 08, 2017 11:17 am Post subject: Re: 170cm 67" propeller on a trigear

John Nigel...thanks for all. I'm inform you as soon as possible.



Bye

Olivier

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