Today's Message Index:
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1. 12:14 PM - RV-6 160 HP Best Climb Speed at MTOW (George Nielsen)
2. 02:30 PM - Re: RV-6 160 HP Best Climb Speed at MTOW (FLYaDIVE)
3. 03:31 PM - Re: RV-6 160 HP Best Climb Speed at MTOW (Charlie England)
Message 1
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| Subject: | RV-6 160 HP Best Climb Speed at MTOW |
If you happen to know at which speed one gets the highest rate of
climb (Vy) with an RV-6 with a 160 HP Lycoming O-320 and with a
fixed-pitch propeller at maximum take-off weight (MTOW) please let me
know. If you know where I can find this information I would like to
hear that. (I have checked the Vans Website but have not found this
information.)
Thanks.
George P. Nielsen
genie@swissmail.org
Vans RV-6 PH-XGN
The Netherlands
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| Subject: | Re: RV-6 160 HP Best Climb Speed at MTOW |
George:
Vy - Best Rate
Vx - Best Angle
These are determined by the Manufacture. As an experimental YOU are the
Manufacture.
A ball park way of getting Vy & Vx is:
Vy = Vs1 x 1.5
Vx = Vs1 x 1.3
The other thing you may want to use in determining these speeds is
TEMPERATURE - OIL TEMP & CHT.
I use a cruse climb of 100 MPH to 110 MPH
REMEMBER Vy & Vx will change with Density Altitude.
Barry
On Fri, Jul 15, 2011 at 3:10 PM, George Nielsen <genie@swissmail.org> wrote:
>
> If you happen to know at which speed one gets the highest rate of climb
> (Vy) with an RV-6 with a 160 HP Lycoming O-320 and with a fixed-pitch
> propeller at maximum take-off weight (MTOW) please let me know. If you know
> where I can find this information I would like to hear that. (I have checked
> the Vans Website but have not found this information.)
>
> Thanks.
>
> George P. Nielsen
> genie@swissmail.org
> Vans RV-6 PH-XGN
> The Netherlands
>
>
Message 3
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| Subject: | Re: RV-6 160 HP Best Climb Speed at MTOW |
On 07/15/2011 02:10 PM, George Nielsen wrote:
>
> If you happen to know at which speed one gets the highest rate of
> climb (Vy) with an RV-6 with a 160 HP Lycoming O-320 and with a
> fixed-pitch propeller at maximum take-off weight (MTOW) please let me
> know. If you know where I can find this information I would like to
> hear that. (I have checked the Vans Website but have not found this
> information.)
>
> Thanks.
>
> George P. Nielsen
> genie@swissmail.org
> Vans RV-6 PH-XGN
> The Netherlands
Hi George,
You can use the standard formula related to stall speed (I've forgotten
what it is, but something like 1.3 or 1.4 times stall speed) & it will
be close. However, Van himself wrote an article a number of years ago
about that very issue, & discussed the reasons that you can increase the
speed quite a lot above that calculated speed without noticeably
affecting rate of climb. If memory serves, it's related to the
relatively low aspect ratio wing's induced drag going up rapidly at the
low speeds involved at 1.3 or 1.4 * stall.
I went to Van's page & searched for 'best climb speed' & got a lot of
hits; here's one of the generic articles I found:
> http://vansaircraft.com/public/flyrvs.htm
I'd suggest emailing Van's & ask if someone can send you a copy of the
article Van wrote. I'm pretty sure that his recommended best climb speed
number was similar to the link above: in the neighborhood of 110-120
statute mph.
Charlie
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