I should probably leave it since I have not read every post (dont have time
always).
But I did a very simple test a while ago for myself. Not any scientific as I
did not think there was need. But the numbers are there still
http://www.jojoen.no/volz
So up too 1,8A with a MM XP
I am prety sure that the elevator servo on a X-tail sailplane demands just
as much power as a flap servo. But that is only in the zoom and speed turns
mostly. Atleast my zooms improved when I changed the servo... I will sure
outfit my Supra with a good elevator servo for sure. But I will stay with my
regular 4cell pack and wires I find convenient that day.
I dont think there is much power needed for a rudder in a TD model. Unless
the rudder is huge. I fly my Superior and Giant electro with a tiny 6g servo
on rudder and have no issues (other than in out of the car...).
Hilsen (Regards) Jojo
NEW: www.jojoen.no
----------------------------------------------------------------------
Date: Tue, 21 Feb 2006 18:52:58 -0600
From: S Meyer <[EMAIL PROTECTED]>
To: Mark Drela <[EMAIL PROTECTED]>, soaring@airage.com
Subject: Re: [RCSE] Carbon Supra #48 flies - weight < 61 oz !
Message-ID: <[EMAIL PROTECTED]>
Mark I enjoy reading your posts, very interesting. Makes me think of
Spock. :-)
What about elevator loads? And elevator servo moment? How would
that be calculated?
At 10:08 AM 2/18/2006, Mark Drela wrote:
Molded Supra launch hinge moments are listed below,
for a 200 lb tow load (hard F3j launch). For smaller
tow loads, hinge moments will be proportionally smaller.
wing camber = +10 deg
rudder defl = 30 deg
wing CL = 1.2
lift = 200 lbs
q = 0.16 psi = 1104 Pa
V = 95 mph = 42.5 m/s
Flap hinge moment = 4.87 in-lb = 78 in-oz = 5.62 kgf-cm
Ail. hinge moment = 3.15 in-lb = 50 in-oz = 3.60 kgf-cm
Rud. hinge moment = 2.12 in-lb = 34 in-oz = 2.45 kgf-cm
To get the servo moment (torque), this hinge moment must be multiplied
by a linkage geometry factor, which is approximately by the ratio of
servo/surface horn lengths. This is between 0.7 - 0.9 for most
installations.
Assuming a horn length ratio of 0.8, the servo moments are:
Flap servo moment = 62 in-oz
Ail. servo moment = 40 in-oz
Rud. servo moment = 27 in-oz
------------------------------
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