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trying a new prop

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Jimmy Young

Joined: 24 Nov 2007
Posts: 182
Location: Missouri City, TX

Posted: Wed Apr 13, 2011 9:36 am Post subject: trying a new prop

Gang,



I am trying out a Warp Drive 3 - blade 64" prop on my Firestar. I flew it about 20 minutes this morning in "perfect" air ( 60 deg, low humidity, calm). My main reason for getting the Warp is I wanted a more durable prop. 



I'm going to fly a few more times before I make an evaluation compared to the 66" 2 - blade Powerfin, but I will say the first flight #'s were pretty good. The prop was very smooth and had a more immediate response to the throttle than the 2 - blade.



My only concern is the HKS is similar to the Rotax "B" box in that it calls for a max. 3000 kg moment of inertia on the prop. I do not know what the MOI is for this prop and am having trouble finding anyone who does. I am aware of the measuring proceedure available from Rotax and CPS, just would like to find the info first rather than go through the exercise. Does anyone have any MOI data on their 3 - blade Warp Drive props?

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_________________
Jimmy Young
Missouri City, TX
Kolb FS II/HKS 700

capedavis(at)yahoo.com
Guest

Posted: Wed Apr 13, 2011 11:27 am Post subject: trying a new prop

Why not ask Warp Drive? Chris Davis

KXP 503 492 hrs

Glider Pilot

Disabled from crash building Firefly 



---

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed Apr 13, 2011 12:54 pm Post subject: trying a new prop

 	  Quote: 	
		  From the inertia tests I did on a number of props in 2007:


	


Warp Drive 66" 3 blade CNC hub 

Wt. 9 lb. 12 oz. 

 Average time to 30 oscillations, 180 seconds 

Inertia 5200 Kg cm^2 

I should add that this prop had bare, untapered blades. Can you use it as a reference for yours, probably, since it's unlikely that you're going to get to 3000 or under. Tapering will help, stainless steel blade guards will hurt. You might ask Green Sky, or whoever distributes this engine if they've come around to allowing Mobil 1 synthetic with gearbox additives. When Flight Designs was importing the engine they always told me absolutely not, just plain Mobil 1 5W-30. The only other thing you can do is set the idle RPM up a bit, say 2200 RPM minimum and run a magnet through your oil at each change. It you see iron shards it can only come from one place in this engine, the gears. 

 



Rick Girard



On Wed, Apr 13, 2011 at 12:36 PM, Jimmy Young <jdy100(at)comcast.net (jdy100(at)comcast.net)> wrote:

  	  Quote: 	
		  --> Kolb-List message posted by: "Jimmy Young" <jdy100(at)comcast.net (jdy100(at)comcast.net)>

  

 Gang,

 

 I am trying out a Warp Drive 3 - blade 64" prop on my Firestar. I flew it about 20 minutes this morning in "perfect" air ( 60 deg, low humidity, calm). My main reason for getting the Warp is I wanted a more durable prop.

  

 I'm going to fly a few more times before I make an evaluation compared to the 66" 2 - blade Powerfin, but I will say the first flight #'s were pretty good. The prop was very smooth and had a more immediate response to the throttle than the 2 - blade.

  

 My only concern is the HKS is similar to the Rotax "B" box in that it calls for a max. 3000 kg moment of inertia on the prop. I do not know what the MOI is for this prop and am having trouble finding anyone who does. I am aware of the measuring proceedure available from Rotax and CPS, just would like to find the info first rather than go through the exercise. Does anyone have any MOI data on their 3 - blade Warp Drive props?

  

 --------

 Jimmy Young

 Missouri City, TX

 Kolb FS II/HKS 700

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=336833#336833

 

 

 

 

 Attachments:

 

 http://forums.matronics.com//files/100_0153_243.jpg

 

 

 

 

 ===========

 arget="_blank">http://www.matronics.com/Navigator?Kolb-List

 ===========

 http://forums.matronics.com

 ===========

 le, List Admin.

 ="_blank">http://www.matronics.com/contribution

 ===========

 

 

 

 	


-- 

Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

   - Groucho Marx



 

  [quote][b]

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_________________
The smallest miracle right in front of you is enough to make you happy....

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed Apr 13, 2011 1:00 pm Post subject: trying a new prop

Jimmy, I didn't see the picture, sorry. Untapered blades and stainless steel guards, yeah, you're going to be pushing the 6000 kg cm^2 limit pretty hard. I think you can forget about getting anywhere near 3000.  



Rick



On Wed, Apr 13, 2011 at 3:51 PM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:

 	  Quote: 	
		    >From the inertia tests I did on a number of props in 2007:



Warp Drive 66" 3 blade CNC hub 

Wt. 9 lb. 12 oz. 

 Average time to 30 oscillations, 180 seconds 

Inertia 5200 Kg cm^2 

I should add that this prop had bare, untapered blades. Can you use it as a reference for yours, probably, since it's unlikely that you're going to get to 3000 or under. Tapering will help, stainless steel blade guards will hurt. You might ask Green Sky, or whoever distributes this engine if they've come around to allowing Mobil 1 synthetic with gearbox additives. When Flight Designs was importing the engine they always told me absolutely not, just plain Mobil 1 5W-30. The only other thing you can do is set the idle RPM up a bit, say 2200 RPM minimum and run a magnet through your oil at each change. It you see iron shards it can only come from one place in this engine, the gears. 

   



Rick Girard

On Wed, Apr 13, 2011 at 12:36 PM, Jimmy Young <jdy100(at)comcast.net (jdy100(at)comcast.net)> wrote:

    	  Quote: 	
		  --> Kolb-List message posted by: "Jimmy Young" <jdy100(at)comcast.net (jdy100(at)comcast.net)>

    

 Gang,

 

 I am trying out a Warp Drive 3 - blade 64" prop on my Firestar. I flew it about 20 minutes this morning in "perfect" air ( 60 deg, low humidity, calm). My main reason for getting the Warp is I wanted a more durable prop.

    

 I'm going to fly a few more times before I make an evaluation compared to the 66" 2 - blade Powerfin, but I will say the first flight #'s were pretty good. The prop was very smooth and had a more immediate response to the throttle than the 2 - blade.

    

 My only concern is the HKS is similar to the Rotax "B" box in that it calls for a max. 3000 kg moment of inertia on the prop. I do not know what the MOI is for this prop and am having trouble finding anyone who does. I am aware of the measuring proceedure available from Rotax and CPS, just would like to find the info first rather than go through the exercise. Does anyone have any MOI data on their 3 - blade Warp Drive props?

    

 --------

 Jimmy Young

 Missouri City, TX

 Kolb FS II/HKS 700

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=336833#336833

 

 

 

 

 Attachments:

 

 http://forums.matronics.com//files/100_0153_243.jpg

 

 

 

 

 ===========

 arget="_blank">http://www.matronics.com/Navigator?Kolb-List

 ===========

 http://forums.matronics.com

 ===========

 le, List Admin.

 ="_blank">http://www.matronics.com/contribution

 ===========

 

 

 

 	






-- 

Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

     - Groucho Marx



 

 	


-- 

Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

    - Groucho Marx



 

  [quote][b]

- The Matronics Kolb-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
The smallest miracle right in front of you is enough to make you happy....

Jimmy Young

Joined: 24 Nov 2007
Posts: 182
Location: Missouri City, TX

Posted: Thu Apr 14, 2011 2:33 am Post subject: Re:Re: trying a new prop

 	  Quote: 	
		  From the inertia tests I did on a number of props in 2007: 



Warp Drive 66" 3 blade CNC hubï¿½ 

Wt. 9 lb. 12 oz.ï¿½ 

Average time to 30 oscillations, 180 secondsï¿½ 

Inertiaï¿½5200 Kg cm^2ï¿½ 	




Rick,

 

Thanks for the prop MOI info. I do keep my idle up around 22-2300 even with the Powerfin. My HKS has never idled smoothly below 1900 rpm.



Looks like there's only one way to find out the MOI on this prop: I'll pull it off on Sunday & do the oscillation test. It's got my curiosity stimulated. 



 	  Quote: 	
		  Whyï¿½not ask Warp Drive?ï¿½ 	




Chris, 



The first place I checked was with Warp & they said they did not have any MOI data on this prop.

- The Matronics Kolb-List Email Forum -

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_________________
Jimmy Young
Missouri City, TX
Kolb FS II/HKS 700

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