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Propellers - Woodcomp SR3000/2W

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fklein(at)orcasonline.com
Guest

Posted: Mon May 30, 2011 11:04 pm Post subject: Propellers - Woodcomp SR3000/2W

Looking at the Woodcomp website, I see the SR3000/2W as only available  

w/ 1750mm diameter.



Frans...can you help me out? Is your propeller that size or something  

smaller?



Regards,



Fred

A194

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davidjoyce(at)doctors.org
Guest

Posted: Tue May 31, 2011 1:16 am Post subject: Propellers - Woodcomp SR3000/2W

Fred, I have the 3W at 1650mm, which is the largest size that is recommended 

for the mono. Regards, David Joyce

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frans(at)privatepilots.nl
Guest

Posted: Tue May 31, 2011 2:16 am Post subject: Propellers - Woodcomp SR3000/2W

On 05/31/2011 09:01 AM, Fred Klein wrote:

 	  Quote: 	
		   Looking at the Woodcomp website, I see the SR3000/2W as only available

 w/ 1750mm diameter.

 

 Frans...can you help me out? Is your propeller that size or something

 smaller?


	


I have the large one indeed. I'm not sure if it is available in a

smaller diameter with only two blades.



Frans

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MalcolmH

Joined: 10 May 2010
Posts: 15

Posted: Tue May 31, 2011 4:39 am Post subject: Re: Propellers - Woodcomp SR3000/2W

Frans and David,



Thank you for responding to my general query on the Woodcomp propellers in the MP thread. I'm responding in this one as it seems more appropriate here. 



David, I read with interest you article in last years Europa Flyer regarding the higher twist performance of the SR3000. I assumed that Woodcomp had made this especially for you and wasn't readily available. I imagine the LAA will now accept this prop on the mono. I suppose one complication may be that I have the 912S engine?.



Fran, Like David I have the monowheel and although the two blade version would be attractive, would the smaller blade performance be acceptable in the two blade version. If this option were chosen I imagine the LAA would require extensive testing to be carried out as well. It could be an expensive experiment.



So, I will get a quote for the SR3000/3W 1650mm complete with backplate and spinner. David has done all the hard work in getting this accepted by the LAA. All that I have read would suggest that the Smart Avionics controller is well suited for the job. Would either of you recommend their Manifold Pressure transducer or did you go for something else.



Regards



Malcolm Hendra (Kit 121)

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carl(at)flyers.freeserve.
Guest

Posted: Tue May 31, 2011 5:24 am Post subject: Propellers - Woodcomp SR3000/2W

Hi,



A manifold pressure gauge is a mandatory LAA requirement - you may as well

use the one supplied by Smart Avionics. Can't see the advantage of using

anything else.



It's pretty likely that a 2 bladed prop would be unacceptable to the LAA due

to the increased diameter. The standard 3 blade prop is just on the limits

of what they will accept for a mono-wheel (especially the original Classic

engine installation). The newer engine mounting/ cowlings have the engine

about 2" higher off the ground than the original design.



Hope that helps,

Carl



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frans(at)privatepilots.nl
Guest

Posted: Tue May 31, 2011 5:37 am Post subject: Propellers - Woodcomp SR3000/2W

On 05/31/2011 02:39 PM, MalcolmH wrote:



 	  Quote: 	
		   Fran, Like David I have the monowheel and although the two blade

 version would be attractive, would the smaller blade performance be

 acceptable in the two blade version.


	


I'm not sure so I suggest to ask Jiri from Woodcomp about this before

you order.

My feeling is that it should work. I have an intercooled 914 to drive

the prop, you have a smaller engine and want to have a smaller diameter

prop, which sounds reasonable to me.

If possible, I would go for the two blade version. It saves weight, has

less gyroscopic effects, is more economic in fuel and allows a higher

speed. And allows easier removal of the lower cowling as well.

It is just a bit more important to keep the carbs balanced, I feel it is

a good thing that any carb problem reveals itself immediately as

vibration. Others prefer a three blade as it runs smoother in all

situations, even when one carb takes up the slack.



I'm not sure if it has any practical meaning for you, but I went through

the dreaded noise tests and paperwork to get a noise certificate for my

installation. But probably any deviation from my specific setup makes it

non-transferable although logic predicts that a smaller engine and a

smaller diameter prop won't produce more noise. BTW it came out at 63dB.

(Couldn't believe it first because on the ground the prop is quite

noisy, probably because the inner part with the large twist is stalled

out while the forward speed is zero, but once flying it climbs like a

rocket and it brought me very high above the sound measuring spot  Oh

and this was with the exhaust augmenter and this might cut down a bit on

exhaust noise as well).



 	  Quote: 	
		   All that I have read would suggest that the

 Smart Avionics controller is well suited for the job.


	


Yes it is. I have the prop with the feather option, it comes with a

faster motor, and in fact it reacts so fast that it behaves like a

conventional CS prop. Anything I do with the throttle, it never leaves

the target 5000 RPM.



 	  Quote: 	
		   Would either of

 you recommend their Manifold Pressure transducer or did you go for

 something else.


	


If I recall correctly this pressure transducer is optional. It only

serves two purposes: to display the % power and/or MAP, and to use the

"Throttle" function. (This allows the controller to sense when you

suddenly close the throttle in a faster than normal way, like when you

want to descend, and it then keeps the prop in coarse pitch rather than

trying to keep the target RPM. The idea is that you can subsequently

slam the throttle wide open without risk of overspeeding the prop). I

found it hard to utilize this function as I have learned to be slow on

the throttle anyway so the "throttle" function rarely kicks in and in

the case of a go around I would still throttle up slowly, giving the

controller enough time to cycle the prop to coarse.

I have a 914 which has a constant high airbox pressure regardless of

altitude, I recall there was a different recommendation for the specific

MAP transducer for the non-turbo engines.

In hindsight I found the need for this transducer minimal. I have it,

and it now serves mainly as a backup display for the MAP.



Frans

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frans(at)privatepilots.nl
Guest

Posted: Tue May 31, 2011 5:47 am Post subject: Propellers - Woodcomp SR3000/2W

On 05/31/2011 03:21 PM, Carl Pattinson wrote:

 	  Quote: 	
		   It's pretty likely that a 2 bladed prop would be unacceptable to the LAA due

 to the increased diameter. The standard 3 blade prop is just on the limits

 of what they will accept for a mono-wheel (especially the original Classic

 engine installation). The newer engine mounting/ cowlings have the engine

 about 2" higher off the ground than the original design.


	


And I have to add that with my tri-gear installation, I have extended

the nose gear with 5cm (2 inches) for higher ground clearance as my

"home" field is a bumpy grass strip. But this is for my 1750mm prop.



Frans

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MalcolmH

Joined: 10 May 2010
Posts: 15

Posted: Tue Jun 28, 2011 2:26 am Post subject: Re: Propellers - Woodcomp SR3000/2W

Sorry for the late response I have been away for a few weeks.



I did contact Jiri regarding the use of the 3000/3W with a 912S and here is his response

"Dear Malcolm,

I recommend you to use the three bladed propeller type SR 3000/3 - diameter 1650mm.

We made the special propeller for David - it means the SR 3000/3W - diameter 1650mm but it works on the 914turbo only. David prefered the  twisted blades due to high altitude flying.

Double bladed propeller type SR 3000/2W - but the diameter 1650mm - I don´t have any experience with this shorter diameter.



Could you contact our UK partner Mr Kevin Dilks, please ?



Best regards

Jiri"



I don't understand why the 3W would not work with the 912S and also the reference to Dave's high altitude flying but there you go, Im still pondering.



thoughts anyone?



Malcolm Hendra (Kit 121)

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