The Kevlar tow that I used is roughly an eighth inch wide. The tow
is basically a bunch of parallel fibers that are not bonded to each
other. While wrapping the spar, I have to take a little care to
spread out the tow and not get twists in it. Near the center of the
wing, the wraps should ba
Hi Vince,
A few years back, I became intrigued with high-start launching and
began to look at how to optimize a launch. My ruminations have been
included on the Charles River Radio Controllers web site:
http://www.charlesriverrc.org/articles/design/dickwilliamson_histartphysics.htm
To tran
Title: Re: [RCSE] Foamie trainer...
Hi Les,
I have been a promoter of the EPP Highlander as a great sailplane
trainer. Following my advice, many beginners in our club,
Charles River Radio Controllers, bought and built Highlanders.
Some experts at the field tried the plane and complained that i
Title: Re: [RCSE] Speaking of carbon spars
...
Scott Martin asked:
What's the
best adhesive for affixing carbon strips to wood
spars?
Epoxy works well. However, be
sure to sand the carbon fiber first.
Dick
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Dr. Richard C.
W
Don,
You asked:
Anybody have a way to tint your canopy w/o warping the plastic?
RIT dye works fine. The first time I used the dye, I had the water
too hot and warped the plastic. The second time, I used a scrap
piece of plastic for testing. With a thermometer in the water, I
kept raising the
Title: Re: [RCSE] Choosing Stab
Sections
Hi Adam,
You might consider
Mark Drela's HT series airfoils. These are designed to have
minimal dead band.
http://www.charlesriverrc.org/articles/drela-airfoilshop/markdrela-ag-ht-airfoils.htm
Dick
Hi folks,
Hoping someone can give me a hand with the
Title: Re: [RCSE] Tailbooms
Mike Fox asked:
Back to
doing some building again. It has been a few years and don't remember
where I got some tailbooms for DLG. I am thinking it is what most
DLG's are using now.
Where came
these be purchased?
A source for a variety of high-quality booms is Rick
Title: Re: [RCSE] Carbon fiber reinforced
spars
Hi Wes,
I am in the process of building a Majestic. Mark Drela has
provided a series of suggested modifications for the Majestic, one of
which is to add carbon fiber to the spars. For this 110-in.-span
plane, he recommends tapered carbon fiber fo
Title: Re: [RCSE] Majestic 110" RES from Laser
Arts
Dan said:
I'm looking to
build a RES ship to fly in our local club contests. While doing a
Google search, I ran across the Majestic 110" RES from Laser
Arts.
Question: has
anyone had any experience with this kit - pros or cons? Flying
charact
Title: Re: [RCSE] Winch launching...
thanks!
Hi Jeff,
I am guessing that you followed the
advice of Anker Berg-Sonne of CRRC. He wrote up his suggestions
along with video images at:
http://flyesl.com/News-y-Articles/featured_article.asp?FORUM_ID=7&TOPIC_ID=112
Dick
All the negative stuff tha
Hi Rense,
You said:
I'm looking for a rank beginner's 2M plane for an acquaintance. Has anyone
any experience with the Defiant as advertised by NSP? Any other (low
building) suggestions?
For many years, I have been a strong proponent of the EPP polyhedral
Highlander as a beginner's plane. There
Title: Re: [RCSE] Blue Hills slope soaring pictures on
CRRC p
Stuart said:
I cannot recall whether there was any
conversation on RCSE about
slope soaring at an inland Massachusetts site - Blue Hills
Reservation. If anyone has soared this site can you let me know a
little bit about how it was? I
raqmaninov wrote:
Hello All,
This forum is great. I'm learning all sorts just by reading!
After years of building my kids 'chuckies' and band powered gliders
from balsa, I've taken the plunge and bought myself a GreatPlanes
Spirit(seems to be a good beginners choice)
Did you buy a ki
Joedy,
To clarify what Tony is saying, you can make up servo wiring by
taking individual "wires" and twisting them together. Each "wire"
should be made up of many small copper strands surrounding by an
insulating jacket. You can get "solid" wire which is a single piece
of copper surrounded
The lost plane beeper/alarms are designed to look for incoming
control signals from a transmitter on the same frequency as the
receiver in the plane. If the alarm circuitry is powered, i.e.
receiver battery is on, but senses an absence of incoming signals,
the beeper starts sounding. One way
Whenever a discussion of optimum flight strategy in head winds and
sink comes up, I go back to an excellent web site that graphically
ties all of this to drag polars:
http://home.att.net/~jdburch/polar.htm
In a head wind, you do not want to fly at the max L/D, as illustrated
nicely on this we
Ron,
You asked:
>Can someone who is knowledgeable in this area explain why a geared
>motor is (or can be) more efficient than a direct drive. If you
>consider the extra weight of the drive, say 30-35 grams for a good
>planetary gear box, such as cosmotec or graupner(?), and the extra
>weigh
The use of spoilerons is much like the use of upward deflected
ailerons during crow. When the neutral position of both ailerons is
up, as in crow, then a normal aileron input will send one aileron up
and the other down. The problem is that the aileron that is
deflected upward may hit the sto
Andy Roberts asked:
>what is the ezone?
It is an on-line magazine devoted to electric-powered flight:
http://www.ezonemag.com/
Dick
--
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Dr. Richard C. WilliamsonPhone: 781-981-7857
Room C-317
There is already a review of the Electra on the Ezone. The reviewer
stated what almost every flyer has noticed, namely, the small
propeller and direct drive are a bad combination. The plane has a
hard time climbing at all. A larger geared folding propeller are
needed for this plane.
Dick
Joel,
This is a copy of a message that I sent to someone via RCSE. Having
gone through the trouble of assembling this list of sites, it might
be useful to put these sites in the Model Design Section of the CRRC
web site.
For on-line resources, one place is to start is the NASA site that
cov
I recommend Martin Simon's book, "Model Aircraft Aerodynamics",
Some of the following sites and comments are copied from an old
message from R. J. Steinhaus. For on-line resources, one place is to
start is the NASA site that covers aerodynamics at the high-school
level:
http://www.lerc.nasa.
I think it was James Deck who asked:
> A young friend of mine, impressed by viewing some of my videos, has
> decided to make a presentation on DS for extra credit in her high school
> honors physics class. I'm providing her with good footage from the videos
> and she has gathered good ba
J S,
You said:
>Due to a severe case of CRS (can't remember sh**), does any one know
>where I saw a listing for a book on programing computer radios? J S
>Fleming
What you are looking for is one or more books by Don Edberg. See his web site:
http://www.flash.net/~dynamic3/
There are four
Ed,
I looked at the use of a turnaround with a high start and decided
that it was not a good idea. Indeed, the turnaround would eliminate
the weight of the rubber. However, an energy calculation indicates
that the energy used to lift up the rubber with a conventional high
start is a small f
Dave,
You said:
>Using a 50 ft piece of rubber and some nylon line (50 ft ?) to create an
>upstart (or mini-hi-start), what is the normal max stretch allowed. I heard
>3 to 1. Is that 100 ft of stretch making the final length of the rubber
>150 ft or is the stretch itself 3 to 1 making the st
Larry,
I bought some three-strand twisted wire from FMA.
I also made up some myself at minimal expense. I bought wire of the
appropriate gauge, fineness of inner strands, insulator thickness and
color, etc. I then took about 10 foot sections of each color, tied
them together in knot at one
Title: Re: [RCSE] Recommend a
hi-start?
Dean,
You said:
My son and
I are new to RC. We have a 2M Spirit and we will be learning to
fly with the help of the local club. We want to get a hi-start
as the flying field is some distance from our house and we hate
risking going over there and not h
Stefan,
The usual sequence is to spray 3M77 on the EPP surface that you are
about to cover. Don't spray the other surfaces until you are ready
to cover. If you spray everything in the beginning, everything on
your workbench will end up stuck to the 3M77 coated surfaces. After
spraying that
Title: Re: [RCSE] Paragon
Lee,
If you take pains to keep the tail light and use the best
light-weighting practice for construction, the balanced Paragon may
come out close to 50 oz. I agree with Stan Myers. At
around 50 oz., the plane is too light to fly well. The plane is
so slow that it is
The Oxford English Dictionary quotes earlier aviation publications:
Decalage, the difference in angle of incidence between any two
distinct airfoils on an aeroplane; e.g., the main plane and the tail;
or more usually between the chords of the upper and lower planes of a
biplane. (from a 1917 p
The Charles River Radio Controllers club is holding its third annual
Rudder-Elevator-Spoiler RES thermal-duration contest at Davis Field in
Sudbury, MA on the weekend of July 1-2. There will be two classes, 2
meter and unlimited.
Pictures from last year's event may be viewed on the club web site
Scobie,
Cape Cod soaring sites are well covered in a summary prepared by Helmut
Lelke of the Charles River Radio Controllers. His excellent summary is on
our club web site at:
http://www.charlesriverrc.org/fields_capecodslopes.htm
One of the favorite places for slopers to stay is the Seascape
My apologies to the list for this long message, but Jeff's email address
doesn't seem to work.
Jeff asked:
>What do you think of the dove?
I have the Dove I, not the Dove II. The Dove I looks like a scaled-down
open-class composite plane. The wings taper down near the tips. Everyone
comments
Paul Koissner asked:
>I'm thinkiing of getting a floater for my nephew this summer.
>Normally I think WindStar or Gentle Lady, but now I'm seeing EPP
>floaters with DiHedtral.
>
>I'm gonna go out on a limb here and venture a guess that the EPP
>floaters don't float as well as the built ups, tradi
Jeff Reid said:
>By better performance, I just meant sink and glide ratio, not
>more speed. The Dove II at www.nesail.com sailplanes 2 meter
>section is the type of glider I might consider... it would
>be a better TD type glider, and allow me to learn how to
>hand catch (assuming with flaps deplo
Rodger,
You asked,
>When using A/R mixing, can you still use rudder independently?
>also I have a futaba 6 xa, not with specific sailplane programsbut
>programmable...for example if I wanted "Crow" for landing, would it still be
>possible? during crow, how are ailerons functioning? Are they
>Where does one get the MAD Highlander?
>Tom
The web site is:
http://www.madaircraft.com/index.html
Regards,
Dick
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Dr. Richard C. WilliamsonPhone: 781-981-7857
Room C-317 FAX:781-981-57
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