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Best Prop for HR 2

 
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Rainair



Joined: 13 Feb 2007
Posts: 10

PostPosted: Sat Dec 04, 2010 11:38 am    Post subject: Best Prop for HR 2 Reply with quote

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



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hr2pilot(at)aol.com
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PostPosted: Sat Dec 04, 2010 9:31 pm    Post subject: Best Prop for HR 2 Reply with quote

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



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sprocket(at)vx-aviation.c
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PostPosted: Sat Dec 04, 2010 10:43 pm    Post subject: Best Prop for HR 2 Reply with quote

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


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lessdragprod(at)aol.com
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PostPosted: Sun Dec 05, 2010 3:48 pm    Post subject: Best Prop for HR 2 Reply with quote

Hi John,

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

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.  Smile

Jim Ayers



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Rainair



Joined: 13 Feb 2007
Posts: 10

PostPosted: Thu May 12, 2011 10:08 am    Post subject: Re: Best Prop for HR 2 Reply with quote

Hello

anyone use woodcomp Propeller ?

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


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n395v



Joined: 10 Jan 2006
Posts: 450

PostPosted: Fri May 13, 2011 5:01 am    Post subject: Re: Best Prop for HR 2 Reply with 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.


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Milt
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stuart(at)stuarthutchison
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PostPosted: Fri May 13, 2011 5:27 am    Post subject: Best Prop for HR 2 Reply with quote

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













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smokyray(at)rocketmail.co
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PostPosted: Fri May 13, 2011 6:45 am    Post subject: Best Prop for HR 2 Reply with quote

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












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t.gummo(at)verizon.net
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PostPosted: Fri May 13, 2011 1:43 pm    Post subject: Best Prop for HR 2 Reply with quote

Guys,

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

---


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PostPosted: Tue May 17, 2011 8:26 pm    Post subject: Best Prop for HR 2 Reply with quote

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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