Today's Message Index:
----------------------
1. 07:40 AM - 3 blade MT vs the Hartzell fat paddle 2 blade (Michael W Stewart)
2. 08:53 AM - Re: 3 blade MT vs the Hartzell fat paddle 2 blade (Tom Martin)
3. 05:07 PM - Re: 3 blade MT vs the Hartzell fat paddle 2 blade (Michael W Stewart)
4. 05:27 PM - Re: 3 blade MT vs the Hartzell fat paddle 2 blade (Mark Swaney)
5. 05:55 PM - canopy safety latch (Jim Stone)
6. 06:36 PM - PC680 source (Jim Stone)
7. 06:49 PM - Re: PC680 source (Walter Tondu)
Message 1
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| Subject: | 3 blade MT vs the Hartzell fat paddle 2 blade |
Thought you guys might be interested in some real world data on these 2
props.
Enjoy,
Mike
http://www.mstewart.net/super8/performance/propcomparisons.htm
Message 2
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| Subject: | 3 blade MT vs the Hartzell fat paddle 2 blade |
Mike
Good data. From my flight tests on my HRII I felt that I
dropped three to four knots going from the two blade Hartzell to the
three
blade MT. I did not, at that time, have the benefit of your prop
clocking
information so the difference in smoothness was worth the swap for me.
Did
you do any flight tests at lower rpms? Most of my cross country work is
at
21 to 2200 rpm and 23=94. Although I do not have data to support my
feeling,
I suspect that there is not as much difference in the two props at that
power setting. Metal blades have the advantage of a thinner profile and
it
is possible that that as you drop rpms that is not as important. On my
current EVO I have a three blade MT and I would really like to be able
to
try a two blade on the plane with the clocking change. I do have some
experience with a three blade Hartzell and it is my opinion that it is
also
faster than the MT but this has not been proven by tests. The main
problem
with the three blade Hartzell is the additional 22 lbs which will work
on a
F1 but is too heavy for a HRII due to the landing gear geometry. Good
work.
Tom Martin
_____
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com] On Behalf Of Michael W
Stewart
Sent: September 6, 2007 10:39 AM
Subject: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade
Thought you guys might be interested in some real world data on these 2
props.
Enjoy,
Mike
HYPERLINK
"http://www.mstewart.net/super8/performance/propcomparisons.htm"http://ww
w.m
stewart.net/super8/performance/propcomparisons.htm
"http://www.matronics.com/Navigator?Rocket-List"http://www.matronics.com/
Nav
igator?Rocket-List
"http://forums.matronics.com"http://forums.matronics.com
06/09/2007
8:36 AM
06/09/2007
8:36 AM
Message 3
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| Subject: | Re: 3 blade MT vs the Hartzell fat paddle 2 blade |
No I did not go below 2200 rpm so I have no good data about that.
I would love to try the 2 blade hartz symetar. Hartz says its worth another 3
knots for me.
We could get together one weekend and have a prop swapping extravaganza! Too
bad the spinners are different.
Best
Mike
----- Original Message -----
From: "Tom Martin" [fairlea@amtelecom.net]
Sent: 09/06/2007 09:52 AM
Subject: RE: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade
Mike
Good data. From my flight tests on my HRII I felt that I
dropped three to four knots going from the two blade Hartzell to the three
blade MT. I did not, at that time, have the benefit of your prop clocking
information so the difference in smoothness was worth the swap for me. Did
you do any flight tests at lower rpms? Most of my cross country work is at
21 to 2200 rpm and 23=9D. Although I do not have data to support my fe
eling,
I suspect that there is not as much difference in the two props at that
power setting. Metal blades have the advantage of a thinner profile and it
is possible that that as you drop rpms that is not as important. On my
current EVO I have a three blade MT and I would really like to be able to
try a two blade on the plane with the clocking change. I do have some
experience with a three blade Hartzell and it is my opinion that it is also
faster than the MT but this has not been proven by tests. The main problem
with the three blade Hartzell is the additional 22 lbs which will work on a
F1 but is too heavy for a HRII due to the landing gear geometry. Good work.
Tom Martin
_____
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com] On Behalf Of Michael W
Stewart
Sent: September 6, 2007 10:39 AM
Subject: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2 blade
Thought you guys might be interested in some real world data on these 2
props.
Enjoy,
Mike
HYPERLINK
"http://www.mstewart.net/super8/performance/propcomparisons.htm"http://www.m
stewart.net/super8/performance/propcomparisons.htm
"http://www.matronics.com/Navigator?Rocket-List"http://www.matronics.com/Nav
igator?Rocket-List
"http://forums.matronics.com"http://forums.matronics.com
06/09/2007
8:36 AM
06/09/2007
8:36 AM
Message 4
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| Subject: | Re: 3 blade MT vs the Hartzell fat paddle 2 blade |
Mike,
Your data only lists altitude, not whether it was indicated, pressure
of density altitude. It can make a real big difference in making
comparisons.
Thanks,
Mark Swaney
National Test Pilot School
On Sep 6, 2007, at 5:04 PM, Michael W Stewart wrote:
>
>
> No I did not go below 2200 rpm so I have no good data about that.
> I would love to try the 2 blade hartz symetar. Hartz says its worth
> another 3 knots for me.
> We could get together one weekend and have a prop swapping
> extravaganza! Too bad the spinners are different.
> Best
> Mike
>
> ----- Original Message -----
> From: "Tom Martin" [fairlea@amtelecom.net]
> Sent: 09/06/2007 09:52 AM
> To: <rocket-list@matronics.com>
> Subject: RE: Rocket-List: 3 blade MT vs the Hartzell fat paddle 2
> blade
>
>
> Mike
>
> = Good data. From my flight tests on my HRII I felt that
> I dropped three = to four knots going from the two blade Hartzell to
> the three blade MT. I did not, at that time, have the benefit of your
> prop clocking information so the difference in smoothness was worth
> the swap for me. = Did you do any flight tests at lower rpms? Most
> of my cross country = work is at 21 to 2200 rpm and 23. Although I
> do not have data to = support my feeling, I suspect that there is not
> as much difference in the two = props at that power setting. Metal
> blades have the advantage of a thinner = profile and it is possible
> that that as you drop rpms that is not as important. = On my current
> EVO I have a three blade MT and I would really like to be = able to
> try a two blade on the plane with the clocking change. I do have =
> some experience with a three blade Hartzell and it is my opinion that
> it is = also faster than the MT but this has not been proven by tests.
> The main problem with = the three blade Hartzell is the additional 22
> lbs which will work on a F1 = but is too heavy for a HRII due to the
> landing gear geometry. Good = work.
>
>
>
> Tom = Martin
>
>
>
>
> From: owner-rocket-list-server@matronics.com
> [mailto:owner-rocket-list-server@matronics.com] On Behalf Of Michael W
> Stewart
> Sent: September 6, 2007 = 10:39 AM
> To: rocket-list@matronics.com
> Subject: Rocket-List: 3 = blade MT vs the Hartzell fat paddle 2 blade
>
>
>
> Thought you guys might be interested in some = real world data on
> these 2 props.
> Enjoy,
> Mike
> h= ttp://www.mstewart.net/super8/performance/propcomparisons.htm
> <
> /pre>
>
> http://www.matron
> ics.com/Navigator?Rocket-List
>
>
> http://forums.matronics.com
>
>
>
> 06/09/2007 8:36 AM
>
>
> 06/09/2007 8:36 AM
>
>
> ========================3
> D====================
> tp://www.matronics.com/Navigator?Rocket-List
> ========================3
> D====================
> cs.com
> ========================3
> D====================
>
>
Message 5
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| Subject: | canopy safety latch |
I've got a tip over style canopy with the Harmon handle to open, close
and latch it. Is there a need or requirement for more than that? BTW,
mechanism is very firm to operate in both directions but possibly could
work loose during flight. Van sells a latch for the RV-4, will that
work on the HR?
Thanks,
Jim Stone
Louisville
First flight prep
Message 6
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Not many venders out there selling it for a good price. My last two
came from Sun battery in Florida, their website was not up today, don't
know if they are still in business. Anyone know of a good place to get
a new battery?
Thanks,
Jim
Message 7
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| Subject: | Re: PC680 source |
On 09/06 9:32, Jim Stone wrote:
> Not many venders out there selling it for a good price. My last two came
> from Sun battery in Florida, their website was not up today, don't know if
> they are still in business. Anyone know of a good place to get a new
> battery?
> Thanks,
Vans has them for $93.00.
--
Walter Tondu
http://www.rv7-a.com - Flying!
http://www.evorocket.com - Building
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