SEN-391 March 22 2000
- Category: Archive 2000
- Hits: 403
News and Reports 2000 - First half
SCAT Electronic News 22 March 2000
To : groupscat
Table of Contents - Colo[u]red issue
Rules - Hinson
More - Not Rules - Hinson
SEN March 20 - Salzer
Thermal Dogs - Schlosberg
Amazing Stuff - Pudney
Lombardi - True or False ? - Starline
Coloring Polyspan. - Stalick
Coloring polyspan/last of RDT (Technical) - Kowal
Dyed and gone to heaven. - Brooks
Colour Me - Woodhouse
correction on the F1A score - Brun
Three cheers for Jim Brooks comments about the constant blab about
rules. Probably the reason there are not many comments about technical
items is that most of the "Hot Dogs" buy what they fly and don't care
about how they could improve on their flying equipment. They just let
someone else do that. I have to compliment Jim. He flys airplanes
totally left handed. Left power pattern, lefthand prop, wound
lefthanded, and uses a lefthanded torque meter.=20
The message I sent earlier today was unintentionally sent unsigned.
A technical discussion that I would like to see revisited is the classic
Wakefield "S" at transition time. I have observed that a good transition
from burst to cruise requires a large amount of wing wiggler deflection.
If the model does not have variable pitch, and is set-up for a pitch low
enough to provide a good cruise, it will go too fast during the burst
for very much wing wiggler. Therefore the transition will be bad. Planes
with variable pitch seem to use the high pitch setting, not as a means
of the best burst climb, but really to slow down the burst climb to
allow a larger wing wiggler deflection without a disastrous left roll or
left turn during the burst, thus making a good transition possible as
the pitch comes down, and speed goes up.
If this makes any sense, I would like to have some comments.
SEN March 20
1) Joe (?) looks for a spraying method.
Aside from using spray cans (expensive, no choice in what is inside)...
I could send him a little drawing of my "do-it-yourself" sprayer made
some 20 years ago, still serviceable and lung powered (or tire, vacuum etc)
requires nothin but a soldering iron and a hand drill. Adress please, I will
2) Why no technical discusions?
a) In my opinion these went out with the BOM-rule.
Who cares about the "why"? Important is only "where" (to buy)!
Look at contest reports. No technical details, just "made by".
Individual tech details? Not interesting, if not made by one of the big
And since nobody publishes any, nobody writes about any ... or vice versa?
b) is RDT not a technical topic?
Even if it certainly is closely connected with the rules!
PS. applause for the fast results of the Holiday on Ice -
on my computer before I even returned from Norway! Thanks!
Some of us have had models with the proclivity of either flying
straight through a thermal or, in extreme cases, even being
repulsed by thermals. These are the kind of models that made
fuses or timers redundant most of the time or the ones that
always sub-max when every other model is easily maxing. I am
trying to compile their common features or traits, if any.
If you happen to have a model fitting this description, Nordics in
particular, I would like its details. Standard mass produced
models are exempt, as they thermal well.
The following details, preferably in the form of a sketch would be
useful: the wing planform, rakes, dihedral heights, warps and
section(s). Other details such as the wing's total weight (without
the rods) as well as the wing's longitudinal CG (balancing a wing
on a ruler) and the rudder's profile would also be welcome.
My snail mail address is: 79-02 212 St. Bayside, NY 11364
Amazingly this stuff (Design Masters Floral spray is also available
up here in Australia. On my last Wake I used two coats upper and lower
surfaces, of "Carnation Red". This was after two coats of nitrate on
Polyspan. It added 0.8gram which it seems to me is pretty good.
Well done with SEN Roger, and you are quite right to cut the
Lombardi - True or False ?
to achteberg, Mattes, et al regarding gaining a" competitive advantage"
A FAMOUS FOOTBALL COACH ONCE SAID 'WINNING ISN'T EVERYTHING,
IT'S THE ONLY THING'
if you truly believe that sportsmen don't cheat, then you qualify as a
potential purchaser of a bridge I have available for sale in
Brooklyn, real cheap, about 100 years old, slightly used.
Some sports where competitive advantage occasionally becomes an important
part of the results includes horse racing (dope up the horse),the biggest
joke sport of recent times, NASCAR racing(a wide variety of gimmiks
available to imaginative competitor) and the Olympics, where the organizers
and athletes both have been caught with their hand in the cookie jar
After more that 50 years of observing the free flight contest scene and
occasionally participating (but not much lately), I have watched contestants
gain the competitive advantage way back when there was a wing loading rule,
to the most recent heating the rubber scenario. to an international contest
where a European team
"coached" me as I timed a team members flight. they could still see it, I
had lost it o.o.s. minutes before.But these sports still exist. in most
cases cheating i saw did not successfully accomplish what is was supposed
to. rule bending will always be with us. just make sure you dont accept it
as part of the game.
I recently read in a ff newsletter about a Krylon product, which is called
"Stained Glass Paint." It comes in a small spray can and is used to spray
glass so that it can resemble stained glass. It is apparently sold in craft
stores. The article stated that the author sprayed three coats of this stuff
on his Jesse James wing plus a clear coat and gained only .75 grams. It is
said to be "transparent and has a vivid color, and the sun shines through
like an intense Japanese tissue."
No mention is made about whether it is fuelproof or not. I haven't found any
locally yet, but am still looking.
Hope this is helpful.
Bob Stalick, NFFS
Coloring polyspan/last of RDT (Technical)
I must first apologize to all those I offended with my discussion on RDT.
I was attempting to illustrate a shortcoming with the current design and
options that this left open. Also to point out a very simple way to trim
a new model in only a couple of flights. I wished to spur some discussion
on how the situation might be corrected. As far as I am concerned all that
needs be done with RDT recievers is to latch the output so that once a
is recieved the output can not be changed. of course there are ways around
this but they are considerably more complicated and could be seen via
I have been using Testors model car paint in flourescent colors on my planes
for years. I have applied it to mylar as well as polyspan. I spray a light coat
on after doping/shrinking and the result really glows in the sun and is highly
visible as the plane approaches the ground. This paint comes in small spray
cans and is used to paint lexan RC car bodies.
Dyed and gone to heaven.
Thanks all for the information. I have easily tripled my knowledge about
how to colour a Wakefield, ignoring all those who would say that it's not
much of a stretch.
> I notice that a lot of people who use aluminized mylar on their
>wings colour the underside black. Could anyone tell me how to do this
>without adding much weight? What will/won't stick to mylar? Could I
>spray on a really thin coat of Sig black, after I degrease the mylar? Or
>maybe epoxy? What about permanent marker, is there a way to get this on in
>one smooth coat, and not have it look like it was used for scribbling
I spray with a black aerosol paint. The idea is vsibility against the
sky , aluminium just takes on the colour of the background like a
chamelion. Very thin spray is used as it colours easily. I use Marabu
Buntlac a quality product but not cheap. When it gets tatty I wipe it
off with solvent, reonvate then re-spray. The weight is about 1 gram.
Note the top is dayglow red/orange for visibility on the bround or
against a background.
Michael J Woodhouse
correction on the F1A score
correction on the F1A score
Peter Allnut drop the last round for a score of 107 seconds.
Iwill contact Tom for the correction
ps I will be travelling for the next week and half so their may be some
slight delay in the production of this fine publication.