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1. 07:10 AM - Re: Best Prop for HR 2and Off subject (rtmarshall)
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| Subject: | Re: Best Prop for HR 2and Off subject |
Hey Tom, The deal is you built the ship and with that as you say is your 390
hr grin. I went for a rip up here in Red Rider to exercise the two blade
Hartzel and stay in practice as it is becoming screaming cross wind time on
our single runway here in the Sierras. I have the ship up for sale again and
will probably will pull it off the market again, lots of picture collectors
and Texas cattlemen but no real buyers these days. Glad to hear that your
still kicking. Bob Marshall.
--------------------------------------------------
From: "Tom Gummo" <t.gummo@verizon.net>
Sent: Friday, May 13, 2011 2:40 PM
Subject: Re: Rocket-List: Re: 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
----- Original Message -----
From: "n395v" <Bearcat@bearcataviation.com>
Sent: Friday, May 13, 2011 6:01 AM
Subject: Rocket-List: 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
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=339741#339741
>
>
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>
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