Today's Message Index:
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1. 04:38 PM - RV7 - Why so fast ? (Ron Walker)
2. 04:56 PM - Re: RV7 - Why so fast ? (Cory Emberson)
3. 05:32 PM - Re: RV7 - Why so fast ? (cgalley)
4. 09:47 PM - Vans RV and Grumman AA-1A (JTAnon@AOL.com)
Message 1
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| Subject: | RV7 - Why so fast ? |
--> RV7-List message posted by: "Ron Walker" <ron@walker.net>
I just got back from my hangar after doing a bit of work on the 7a. I also
own a Grumman AA1A (for sale REAL soon at a great price if anyone is
interested ;o)) which is housed in the same hangar. I had some hanger
neighbors drop in on me for a chat - but I think they were just there to
drool over the RV ;o)....
The topic of speed came up. The AA1A is very similar looking and shares a
LOT of the same design features of the RV. But the RV just beats the crap
out of the Grumman when it comes to speed and climb performance. Both have
very clean wings - low profile gear .. etc etc ... yet my Grumman tops out
about 120 mph while the RV is 200+ .. granted its a larger engine, but even
the RV9 with the O-235 has a book speed of 173 with a larger wing span !
What makes these aircraft so darn clean and fast ?
Ron
Message 2
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| Subject: | Re: RV7 - Why so fast ? |
--> RV7-List message posted by: "Cory Emberson" <bootless@earthlink.net>
> yet my Grumman tops out about 120 mph while the RV is 200+ .. granted its
a larger engine, but even the RV9 with the O-235 has a book speed of 173
with a larger wing span ! What makes these aircraft so darn clean and fast ?
<
Van Magic!
Seriously, the AA1B develops, what, 118 horse? What is the difference
between the empty weights of the two aircraft? And what engine is your 7A
turning? I'd think the RV is faster b/c of its (assumed) lighter weight and
cleaner design, as wonderful as "Uncle Roy's" touch is on the Grumman.
I learned to fly in a Tiger, and have a great appreciation of the design!
best, Cory
Message 3
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| Subject: | Re: RV7 - Why so fast ? |
--> RV7-List message posted by: "cgalley" <cgalley@qcbc.org>
Less frontal area
----- Original Message -----
From: "Ron Walker" <ron@walker.net>
Subject: RV7-List: RV7 - Why so fast ?
> --> RV7-List message posted by: "Ron Walker" <ron@walker.net>
>
> I just got back from my hangar after doing a bit of work on the 7a. I also
> own a Grumman AA1A (for sale REAL soon at a great price if anyone is
> interested ;o)) which is housed in the same hangar. I had some hanger
> neighbors drop in on me for a chat - but I think they were just there to
> drool over the RV ;o)....
>
> The topic of speed came up. The AA1A is very similar looking and shares a
> LOT of the same design features of the RV. But the RV just beats the crap
> out of the Grumman when it comes to speed and climb performance. Both have
> very clean wings - low profile gear .. etc etc ... yet my Grumman tops out
> about 120 mph while the RV is 200+ .. granted its a larger engine, but
even
> the RV9 with the O-235 has a book speed of 173 with a larger wing span !
>
> What makes these aircraft so darn clean and fast ?
>
> Ron
>
>
Message 4
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| Subject: | Vans RV and Grumman AA-1A |
--> RV7-List message posted by: JTAnon@aol.com
Hi Ron,
I too own a Grumman AA-1A and I'm building an RV7A. I will be VERY
interested to hear what you have to say regarding similarities/differences in flight
characteristics between the two planes once you are flying the 7A.
The original design intent for the AA-1A was a responsive sport-type plane
capable of light aerobatics. From fooling around in other than straight and
level flight I know the roll rate is pretty crisp and pulling back in a dive
produces a pretty impressive pitch attitude (although I would never do actual Acro
unless it was permitted in case the FAA is listening). As far as I know, the
only thing that prevented certification for aerobatics was a spin problem
related to lack of rudder authority (sound vaugley familiar? at least Van came
up
with a solution).
Anyway, I'll really be curious.
John McDonnell - RV 7A QB kit #9 (The world's slowest quickbuild kit)
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