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Old May 02, 2003, 04:02 AM
Simon Van Leeuwen
Guest
n/a Posts
[RCSE] F5J - Gaining Altitude by adding Camber

I was contemplating the idea of trading velocity for altitude by adding
TE camber during ascent on an 3.4 meter F5J Moebius, as opposed to
leaving the TE clean and working the elevator based on observation.

At first thought, it would seem that it is six of one, and half a dozen
of another. The end-goal is to increase ascent-rate efficiency during
motor-run, in other words get to altitude sooner using the same amount
of power.

Any thoughts...anyone experimented with this before I put a LoLo in and
measure?
--
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ *~*~*~*~*~*
Simon Van Leeuwen, Calgary, Alberta
RADIUS SYSTEMS
Cogito-Ergo-Zoom
IAC25233*MAAC12835*IMAC1756*LSF5953*IMAA20209
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ *~*~*~*~*~*
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Old May 02, 2003, 04:02 AM
Brian Chan
Guest
n/a Posts
Re: [RCSE] F5J - Gaining Altitude by adding Camber

>I was contemplating the idea of trading velocity for altitude by adding
>TE camber during ascent on an 3.4 meter F5J Moebius, as opposed to
>leaving the TE clean and working the elevator based on observation.
>
>At first thought, it would seem that it is six of one, and half a dozen
>of another. The end-goal is to increase ascent-rate efficiency during
>motor-run, in other words get to altitude sooner using the same amount
>of power.
>
>Any thoughts...anyone experimented with this before I put a LoLo in and
>measure?
>--


Depends on the airfoil, some are designed for chamber changing and
some are not. Look at what you have and decide what to do.

Brian

--
Brian Chan,
An Electric Airplane Junkie @ San Mateo.Ca.USA
RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to soaring-request@airage.com. Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Old May 02, 2003, 04:02 AM
Ben Diss
Guest
n/a Posts
Re: [RCSE] F5J - Gaining Altitude by adding Camber

Simon- Climb is the result of vertical thrust, not an excess of lift, so this may make no difference. If, on the other hand, TE camber could allow the wing to produce more lift with less drag the amount of vertical thrust may increase.

Having said that, the full scale conventional wisdom holds that the greatest rate of climb is attained with no flaps and the greatest angle of climb is attained with some low flap setting. This, of course, may have no relevance to our flying.

I suppose this whole line of thinking is what brought you to ask if anyone has actually tested this. I'm not sure a LoLo would prove anything because it doesn't measure AOA. I'd be interested in what you find.

-Ben

Simon Van Leeuwen wrote:
>
> I was contemplating the idea of trading velocity for altitude by adding
> TE camber during ascent on an 3.4 meter F5J Moebius, as opposed to
> leaving the TE clean and working the elevator based on observation.
>
> At first thought, it would seem that it is six of one, and half a dozen
> of another. The end-goal is to increase ascent-rate efficiency during
> motor-run, in other words get to altitude sooner using the same amount
> of power.
>
> Any thoughts...anyone experimented with this before I put a LoLo in and
> measure?
> --
> *~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ *~*~*~*~*~*
> Simon Van Leeuwen, Calgary, Alberta
> RADIUS SYSTEMS
> Cogito-Ergo-Zoom
> IAC25233*MAAC12835*IMAC1756*LSF5953*IMAA20209
> *~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ *~*~*~*~*~*
> RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to soaring-request@airage.com. Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.

RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to soaring-request@airage.com. Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Old May 02, 2003, 04:02 AM
Simon Van Leeuwen
Guest
n/a Posts
Re: [RCSE] F5J - Gaining Altitude by adding Camber

Thanks Ben, what the LoLo will measure...is rate of ascent.

Ben Diss wrote:
>
> Simon- Climb is the result of vertical thrust, not an excess of lift, so this may make no difference. If, on the other hand, TE camber could allow the wing to produce more lift with less drag the amount of vertical thrust may increase.
>
> Having said that, the full scale conventional wisdom holds that the greatest rate of climb is attained with no flaps and the greatest angle of climb is attained with some low flap setting. This, of course, may have no relevance to our flying.
>
> I suppose this whole line of thinking is what brought you to ask if anyone has actually tested this. I'm not sure a LoLo would prove anything because it doesn't measure AOA. I'd be interested in what you find.
>
> -Ben
>
> Simon Van Leeuwen wrote:
> >
> > I was contemplating the idea of trading velocity for altitude by adding
> > TE camber during ascent on an 3.4 meter F5J Moebius, as opposed to
> > leaving the TE clean and working the elevator based on observation.
> >
> > At first thought, it would seem that it is six of one, and half a dozen
> > of another. The end-goal is to increase ascent-rate efficiency during
> > motor-run, in other words get to altitude sooner using the same amount
> > of power.
> >
> > Any thoughts...anyone experimented with this before I put a LoLo in and
> > measure?
> > --
> > *~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ *~*~*~*~*~*
> > Simon Van Leeuwen, Calgary, Alberta
> > RADIUS SYSTEMS
> > Cogito-Ergo-Zoom
> > IAC25233*MAAC12835*IMAC1756*LSF5953*IMAA20209
> > *~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ *~*~*~*~*~*
> > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to soaring-request@airage.com. Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.


--
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ *~*~*~*~*~*
Simon Van Leeuwen, Calgary, Alberta
RADIUS SYSTEMS
Cogito-Ergo-Zoom
IAC25233*MAAC12835*IMAC1756*LSF5953*IMAA20209
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ *~*~*~*~*~*
RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to soaring-request@airage.com. Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
 


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