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170cm 67" propeller on a trigear

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davidjoyce(at)doctors.org
Guest

Posted: Fri Sep 08, 2017 1:40 am Post subject: 170cm 67" propeller on a trigear

Olivier, As I remember it, the LAA will not aprove a propeller larger than 1.6m on a mono and I suspect the same would apply to a trigear. Even then I have heard of several being broken with rough landings. 

Regards, David Joyce, GXSDJ 

   

 

On 2017-09-08 10:21, JohnFrance wrote:  	  Quote: 	
		    	  Quote: 	
		  --> Europa-List message posted by: "JohnFrance" <77alembert(at)gmail.com (77alembert(at)gmail.com)>



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?



--------

Europa mono Nr 192





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kheindl(at)msn.com
Guest

Posted: Fri Sep 08, 2017 12:40 pm Post subject: 170cm 67" propeller on a trigear

So what then is the required clearance for the trigear ? 

My 2-blade Woodcomp is 69.5 inches with a ground clearance of 10 inches. 

Cheers, 

Karl 

  From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> on behalf of Nigel Graham <nigel_graham(at)m-tecque.co.uk>

 Sent: 08 September 2017 16:37:26

 To: europa-list(at)matronics.com

 Subject: Re: 170cm 67" propeller on a trigear  

 

 

  --> Europa-List message posted by: "Nigel Graham" <nigel_graham(at)m-tecque.co.uk>

 

 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 1Â·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 11:02 pm Post subject: Re: 170cm 67

waouh!! 69.5"??? and 10 inches ground clearance. is it an europa monowheel?

because with my calculations, a propeller of 67" diameter, gives 9,5 inches for ground clearance with trigear.



Olivier

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Remi Guerner

Joined: 14 Dec 2010
Posts: 284

Posted: Sat Sep 09, 2017 12:27 am Post subject: 170cm 67" propeller on a trigear

Hi Nigel,

For sure the Monowheel with the standard 62 or 64" prop is far from complying with that requirement!

Remi

<<<<(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 15 g. >>>>

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Nigel Graham

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

Posted: Sat Sep 09, 2017 7:05 am Post subject: Re: 170cm 67

Karl,



So what then is the required clearance for the trigear ? 

My 2-blade Woodcomp is 69.5 inches with a ground clearance of 10 inches. 

Cheers, 

Karl 



To test for 1.5g worst case, let the tyres down, load the aircraft to 931.5 Kg (2025 lbs) and measure the clearance - there should be some!



To test for static clearance at MAW with tyres inflated, there should be 180mm (7 inches) of clearance.



Remi,



For sure the Monowheel with the standard 62 or 64" prop is far from complying with that requirement! 

Remi 



The reason the XS had it's engine moves 1.5 inches higher than the Classic was to alleviate this problem. In mitigation, the Monowheel does not really "rotate", but takes off and lands in the three (two?) point attitude.



If you are looking at "non-compliance", look no further than the seat belt mounts!



Nigel

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Olivier.hequet@neuf.fr

Joined: 21 Aug 2017
Posts: 40
Location: France

Posted: Sat Sep 09, 2017 8:28 am Post subject: Re: 170cm 67

Hi



I received today the approval of Europa aircraft to mount a durandal 100M propeller of 170cm. I am sending the documents to the DGAC today to finalize the file. I keep you informed



thanks for all

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