Gents,
I have been following the discussion on how fast to fly. There is an
elegant graphical solution to this issue if you have a glide polar diagram
of a representative sailplane.
A glide polar is a graph that relates airspeed and sinkrate. These are
sometimes plotted with sink up and
Gents,
I have enjoyed the zero gravity discussion!
I agree that a sailplane in zero gravity and still air will not glide for
long. But what about dynamic soaring in zero gravity?
As an aside, note that one can achieve very close to zero g flight within a
gravitational field by flying an
Oleg Golovidov,
I have read your note in RCSE about RDS. I have not actually built an RDS
setup, but I have done some considerable thinking about it. Also, I have
been back and forth with Harley a few times and in the end I understood what
he is doing. I also think that I have some idea what
Gents,
The following are coordinates and leading edge information from Richard Weil
via the Bender collection and Chris Adams' web site, respectively. Chris'
site is: http://www.scrollsander.com/NACA2R(1)12.jpg
If anybody tries a RES model with this airfoil, please share the results
with the
[EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
Date: Fri, 27 Apr 2001 18:38:15 -0700
To: Blaine Deborah Beron-Rawdon [EMAIL PROTECTED]
Cc: Soaring [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: Re: [RCSE] Re: F3J model glide ratios?
Wouldn't the ground effect have a large affect on your
In Soaring VI #2151, Richard in Seattle asks how much weight a five HP gas
engine with a 24" prop can lift straight up from a standing start.
A useful formula for static thrust is:
T = 10.414 x F x(D x HP x sqrt(Sigma))^(2/3)
Where T = thrust in pounds.
F is a measure of merit (fudge factor)
Ladies and Gents,
This note is to let you know that Envision Design finally has a modest
website up and running. It currently features a description of "Plane
Geometry", a preliminary design software package for model airplanes. It
also has a technical paper on the augmentation of spiral
Ray,
Thanks for the great report! I'm glad to know that this worked so well!
An extra tidbit on mass balancing polyhedral wings: You want to locate the
lead spanwise with some care. There is an effective torsional axis of the
wing about which the wing is twisting. The tip is above the axis
Aaron,
We really ought to get Mark Drela in on this one! I am over my head,
technically speaking.
But that doesn't stop me from speculating!
I assume by shear center that you mean the effective center of the wing beam
- the location that is effectively resisting the wing deflection. This is
6/18/00
Gents,
I thought that the following exchange might be of general interest to the
group. This arose from an article I published on Michael Shellim¹s
excellent website for RC soaring: http://www.rc-soar.com/tech/spiral.htm.
Fran Miller asked Michael Shellim the question below, and
In Soaring V1 #1033, "Juan Cifuentes" [EMAIL PROTECTED] asked "Anyone
flown a Champion HLG and can recommend CG location? I have set it up
following manufacturer's instructions but it does not work."
I have not flown this model, and I don't know what the plans say, but it
happens that I have
Title: Skeg Rules for RES Sailplanes
A point that has been overlooked in the skeg rule discussion for rudder/elevator/spoiler airplanes is that if skegs are outlawed, designers will find a way around the rule.
The optimum duration sailplane fuselage might feature a drooped forward fuselage
Gents,
This is a short note to let you know that the email address for Blaine
Beron-Rawdon and Envision Design, makers of "Plane Geometry" design software
has been changed to:
[EMAIL PROTECTED]
The change is due to our new cable modem. It's very fast and works great,
by the way.
Thanks,
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