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Best Prop for HR 2

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Rainair

Joined: 13 Feb 2007
Posts: 10

Posted: Sat Dec 04, 2010 11:38 am Post subject: Best Prop for HR 2

Hello,



what the best prop for HR2 ?



[F3YR-1ARF7693DF*1] Hartzell 3-Blade Propeller (D Twist)



[M2YR-1BF/8475D4] Hartzell 2-blade Propeller



[MTV-9-B/198-52] MT 3-bladed propeller 



[MTV-9-B-C/C-198-52] MT 3-Bladed Propeller 



Maybe important is the noise. Which db are the propellers ?



At germany i need 75 decibel



Which Prob to quiet down ?



Thanks,

Rainer

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lessdragprod(at)aol.com
Guest

Posted: Sat Dec 04, 2010 8:35 pm Post subject: Best Prop for HR 2

Hello Rainer,

    

   The quietest propeller is probably the 4 blade propeller, 

   MTV-14-B/190-59b

   with a 76" diameter (190cm diameter).

 

 Regards,

   Jim Ayers

   

 

 

   --

hr2pilot(at)aol.com
Guest

Posted: Sat Dec 04, 2010 9:31 pm Post subject: Best Prop for HR 2

But it sucks for performans



Sent from my iPhone



On Dec 4, 2010, at 8:31 PM, Jim Ayers <lessdragprod(at)aol.com (lessdragprod(at)aol.com)> wrote:



[quote] Hello Rainer,

    

   The quietest propeller is probably the 4 blade propeller, 

   MTV-14-B/190-59b

   with a 76" diameter (190cm diameter).

 

 Regards,

   Jim Ayers

   

 

 

   --

sprocket(at)vx-aviation.c
Guest

Posted: Sat Dec 04, 2010 10:43 pm Post subject: Best Prop for HR 2

I am looking for a 'firewall forward' equipment list for finishing my HR-II.

It would be handy to purchase all of the stuff at once rather than 

discovering all the bits and pieces I need as I go and waiting for parts 

orders.



Anyone have a definitive list?



John, what do you sell that I need?



Vern

lessdragprod(at)aol.com
Guest

Posted: Sun Dec 05, 2010 3:48 pm Post subject: Best Prop for HR 2

Hi John,

    

   I didn't know that you've flown one of these Rocket 4 blade MT Propellers.  

    

   Rainer, in Germany, is likely going to be limited to 2500 RPM maximum.

    

   An F-1 customer with the 3 blade Rocket propeller says the 4 blade MT Rocket propeller is 2 knots sower at 4,000'.

   But faster at 9,500' and 10,500'.

    

   John.  I know this doesn't work for your typical flight.  The highest altitude you reach being when you climb to pattern altitude.  

    

   Jim Ayers

   

 

 

   --

Rainair

Joined: 13 Feb 2007
Posts: 10

Posted: Thu May 12, 2011 10:08 am Post subject: Re: Best Prop for HR 2

Hello



anyone use woodcomp Propeller ?



http://www.woodcomp.cz/download/WC_KW-10_letak_A4.indd.pdf

n395v

Joined: 10 Jan 2006
Posts: 450

Posted: Fri May 13, 2011 5:01 am Post subject: Re: Best Prop for HR 2

I can't speak for a Harmon Rocket but a lot of F1s had a terrible vibration (prop-beat or whatever) that was intolerable with a 2 blade hartzell. Mine was one of them. Changed to a 3 blade MT (one of Jim's)



Problem was gone and plane was much quieter. It did however have measurable loss of performance in climb and cruise as well as top speed.



I think Tom Gummo has a 4 blade MT on his Harmon and I recall somewhere he called it the slowest Rocket in the West.



In my opinion the less blades the better for performance and cost. As to the manufacturer I have heard few complaints about Hartzell or MT. Never heard of the brand you are considering.

_________________
Milt

stuart(at)stuarthutchison
Guest

Posted: Fri May 13, 2011 5:27 am Post subject: Best Prop for HR 2

Should have better climb on 3 blades, but lower top speed (extra blade = more drag). 2 for go, 3 for show!



Kind regards, Stu



www.mykitlog.com/rockfly



Sent from my iPhone



On 13/05/2011, at 11:01 PM, "n395v" <Bearcat(at)bearcataviation.com> wrote:



 	  Quote: 	
		   

 

 I can't speak for a Harmon Rocket but a lot of F1s had a terrible vibration (prop-beat or whatever) that was intolerable with a 2 blade hartzell. Mine was one of them. Changed to a 3 blade MT (one of Jim's)

 

 Problem was gone and plane was much quieter. It did however have measurable loss of performance in climb and cruise as well as top speed.

 

 I think Tom Gummo has a 4 blade MT on his Harmon and I recall somewhere he called it the slowest Rocket in the West.

 

 In my opinion the less blades the better for performance and cost. As to the manufacturer I have heard few complaints about Hartzell or MT. Never heard of the brand you are considering.

 

 --------

 Milt

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=339741#339741

smokyray(at)rocketmail.co
Guest

Posted: Fri May 13, 2011 6:45 am Post subject: Best Prop for HR 2

Best HR2 prop? The one that works:) seriously, the prototype HR2 has a Hartzell 2 blade sold by John. After testing 2 props on mine and chatting with other folks, here is my 2cents.



 I had a "D" twist Hartzell 2 blade on mine optimized for 2500 RPM. Their is also a "J" twist optimized for 2350 RPM. Hartzell also makes a  2blade Blended airfoil prop for the Rocket currently flown by Tom Martin. The MT would be smoother but a bit slower at top end, the 3blade Hartzell is too heavy. 

I would either go with the J twist or BA 2 blade from Hartzell purchased through Harmon (J) or Team Rocket (BA)



Smokey



Sent from my iPhone



On May 13, 2011, at 9:01, "n395v" <Bearcat(at)bearcataviation.com> wrote:



 	  Quote: 	
		   

 

 I can't speak for a Harmon Rocket but a lot of F1s had a terrible vibration (prop-beat or whatever) that was intolerable with a 2 blade hartzell. Mine was one of them. Changed to a 3 blade MT (one of Jim's)

 

 Problem was gone and plane was much quieter. It did however have measurable loss of performance in climb and cruise as well as top speed.

 

 I think Tom Gummo has a 4 blade MT on his Harmon and I recall somewhere he called it the slowest Rocket in the West.

 

 In my opinion the less blades the better for performance and cost. As to the manufacturer I have heard few complaints about Hartzell or MT. Never heard of the brand you are considering.

 

 --------

 Milt

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=339741#339741

t.gummo(at)verizon.net
Guest

Posted: Fri May 13, 2011 1:43 pm Post subject: Best Prop for HR 2

Guys,



I also have a thirty year old engine that I rebuilt.  IO-540J4A5 is only 250 

HP as well.    So who knows what the real HP is?  Jim tells me that I 

just don't have the HP to use my prop properly.

Part of my slowest is that I built the plane myself and while it turned out 

great, I clearly didn't know anything about getting speed out of an 

aircraft.



I didn't have an vibration when I had a two blade Hartzell.  In my case, the 

three blade MT was as fast as the two blade Hartzell.

My four blade MT is slower as I used to cruise:

    at 10,500 or 11,500 MSL

    Full throttle.

    RPM 2100

    Leaned to 10.0 to 10.5 GPH

    KIAS = 140    True = 180 Knots

with MT prop:

    KIAS = 135    True = 170 Knots



For local flying, I really don't see much of a difference.



Numbers are from the top of my head but they are close.



Tom "GummiBear" Gummo

Major USAF Retired, F-4G Wild Weasel Instructor Pilot

Harmon Rocket II, N561FS, 390 hours of the biggest grin



---

sprocket(at)vx-aviation.c
Guest

Posted: Tue May 17, 2011 8:26 pm Post subject: Best Prop for HR 2

Message for John Harmon:  Is your on-line ordering system up to date?  It 

appears to add tax to my shopping cart, even though I'm located in Canada. 

I need to order some stuff, should I use your website or just contact you 

via email?



Thanks,

Vern Little

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