This leads me to wonder: How easy is it to repair a torn up RAD due to a
malfunctioning brain upon arriving at the landing area? Is the repair
do-able at the field, i.e. between rounds at a contest? Does the servo
geartrain blow instead?
Brent Hoover
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Ed -
If yourshark tooth and skeg are large drag producers something is wrong.Try aligning the skinnyaxis of the skeg with the flight path of the airplane.
I'll gladly give up any drag the skarks tooth generates for the landing points they generate.
happy trails - Rob Glover
You know it's kind
Well why don't you put a retractable skeg on your model. That way you can
have the best of both. While at it. also do a retractable tow hook.
And don't forget to slim down that fuse.
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Ok I see there were plenty replies after I wrote this but anyhow...
The name is Martin Hepperle he has a nice article about drag and linkage
http://www.mh-aerotools.de/
Direct link http://www.mh-aerotools.de/airfoils/linkage.htm
It might seem small but with the small differences in todays
I recently setup top driven flaps and noticed two things:
A little trickier to setup, especailly if there is a secondary TE spar
and the servos are mounted to the servo cover (are they all this
way?).
The benefit of the top driven is the linkage is pushing on the fat
part of the horn, instead of
On this noteQuestion for Mr Drela, or any of the
aero guys out there...
I believe MH's study was geared more towards F3B and
higher performance flying, and he came up with a
figure of 3%. So let's assume, at TD speeds... linkage
hanging out the bottom adds 2% drag to the airframe.
If our
At a high Cl, the linkage drag relative to everything else is pretty small.
For a straight TD model, it would be nice to reduce drag a little during
the zoom. He who launches highest..
And FWIW, Mark Drela does have internal linkages on his Supra. Or course,
some of us also wonder if he
The biggest benefits of RADS for the average flyer are
1. storage and handling and
2. much less landing damage.
Rick
Richard Hallett Pittsfield ME
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I would have to argue number 2.
Damage to linkages does not happen because they are external. It happens
because you do not get the flaps up before dorking a landing.
However similar damage could occur with either method.
Steven Meyer
SOAR
LSF IV
At 04:16 PM 6/22/2005, Richard Hallett
I like bottom driven flaps and ailerons for various reasons. According to
Dr. Hepperle a properly faired set of 4 linkages on the bottom of a wing add
around 3% total drag to a typical F3B airframe. You can go dig around his
website and find a number of interesting tidbits.
From: [EMAIL PROTECTED]
Date: Tue, 21 Jun 2005 19:16:51 EDT
To: Soaring@airage.com
Cc: [EMAIL PROTECTED]
Subject: [RCSE] Re: top or bottom driven ?
I like bottom driven flaps and ailerons for various reasons. According to
Dr. Hepperle a properly faired set of 4 linkages on the bottom
You know it's kind of funny. We spend all this time trying to build the
cleanest plane possible with internal linkages and as little drag as
possible trying to get that last bit of performance. Then we strap on the
large drag inducers know as skegs to stop us on landing. What's wrong with
this
Thats good Ed.:-)
dh
You know it's kind of funny. We spend all this time trying to build the
cleanest plane possible with internal linkages and as little drag as
possible trying to get that last bit of performance. Then we strap on the
large drag inducers know as skegs to stop us on
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