2.4 Receivers and Ignition Engines

https://www.rcgroups.com/forums/showthread.php?2881094-A-really-FASST-JR-9303


So, Andy Kunz of Horizon Hobbies was kind enough to send down three of their top-of-the-line receivers to test at The Boice Model Airplane Ranch.

Live Wire Rebel with converted Heath Kit radio

old radio converted to 2.4 gHz

Tom, It flies GREAT! Just the way Pappy DeBolt designed it. It flew right of the board as they say. A little right trim under power, but that's it. Powered by a P.A.W. 1.49 cc twin ball bearing diesel

that starts every time with 3 flips, it weighs 29 ozs. which is 10 ozs. below the 1956 design weight. I built one in 1957 when I was 14, powered with an OK 074 with a Lorenz 2 tube rx and a Demeco

servo, which was sorta like a compound escapement, but with more batteries. Never got more then some marginally controlled crashes. Times sure have changed. Tony Stillman's conversion performed

flawlessly. Thanks for the tip.

Dave

Updated Heathkit

Tom,

Here is my 2.4 gHZ Heathkit, courtesy of Tony Stillman of Radio South. I haven't flown it yet, but it works great on the bench with the XPS Nano receiver. The background is my building area/office/dinner table with

the semi finished wing panels for my Thor that I hope to fly this year in the Brown Jr. event at the SAM Champs.

2.4GHz: is it all it’s cracked up to be?

We recently received this intriguing article from Dave Horvath and invite you to read it and then join in the discussion.  

A substantial number of unexplained crashes of radio control model airplanes on 2.4GHz frequency prompted me to write this article on the so-called “interference free” radio control systems on the 2.4GHz band.          
The electromagnetic wave spectrum is subject to the immutable laws of physics.
The propagation characteristics of the 2.4GHz wavelength and the environmental effects of this frequency are more complex than on the 72MHz band. To better understand this, we have to look at the electromagnetic wave spectrum where 72MHz band is in the broadcasting region and the 2.4GHz band is in the microwave region. It is easier to see the huge difference between 72MHz and 2.4GHz frequencies when we convert 2.4 gigahertz to megahertz. Now it is 2400MHz versus 72MHz. When frequency increases, wavelength decreases. Therefore, the 2.4GHz wavelength is shorter and closer to visible light on the electromagnetic wave spectrum. Since visible light is also an electromagnetic wave, 2.4GHz wavelength behaves more like visible light and travels in straight lines until it is reflected, deflected, diffracted or absorbed. Reflection and diffraction will create interference. When parallel rays of light are reflected by a concave mirror, it greatly increases the intensity of light at the focal point. A parabolic dish antenna works the same way for a 2.4GHz electromagnetic wave. Since we cannot focus a high gain directional parabolic dish antenna between our constantly moving model airplane and our transmitter, we have to use an omnidirectional vertical antenna system which has much lower signal intensity.  

Read the rest here.

A Texaco Foote Westerner (scaled up A version) Part 1

Several years ago, this 'A' Westerner was scaled up with two fuselages by John Hatch of Canada. The first fuselage was to permit the model to be flown in the Ohlsson .23 event and was therefore fitted with an O&R23 sideport. Subsequent rule changes would forbid scaling of models for this event so the fuselage remained unused in my basement for some time.

The model was flown, however, in 'A Texaco' fitted with an Mvvs .15 and the sliding/fuel line disconnect mechanism seen attached to the engine lug. The model would get so high that this was employed every time it was flown even though we were using, by now, the smaller 8cc tank.

At the 2006 SAM Champs, the model was hit by radio interference and made an abrupt hammerhead from about 500ft into the pavement after an otherwise very docile climb out.














The O&R fuselage was refitted with the Mvvs .15 and a new wing (this time the approved extended wing) was framed up by Bucky Walter which awaits covering. The original construction is a little too flimsy for iron on films, so F.X. Ryan has added the diagonals seen above. The model will also be equipped with a new Spektrum 2.4 gHZ receiver this time.




Note also that there were three distinct Foote Westerners in the Old Timer period (the Foote Racer and Soarer are nostalgia models). This one differs from the more common 'C' Westerner seen here and here which has been scaled up and down in the following ways:

1. Higher aspect ratio wing (in either length)
2. Thinner airfoil
3. Undercambered stabilizer
4. Taller fin

Nostalgia Foote Racer

Aug 31, 2012 update
The plan for the A version is now being sold by Jim O'Reilly

Leon Shulman's Wedgy

Leon's Bio

The Shulman Wedgy as built by Glen Poole of Chicago for Speed 400

And, by Allan Laycock of Australia

The Wedgy was designed by Leon Shulman of the Brooklyn Skyscrapers back in 1940. It was built in 3 sizes but the A size is by far the most common.

Bucky's Wedgy


Hi Tom,

Almost ready to cover. I keep finding little things to do. Maybe I will start covering the tail surfaces tomorrow.

Bucky

Flying the Vic Smeed Popsie with Bucky Walter

Small Electric Lanzo Airborn

Bucky,

We got our big snow just before Christmas on Long Island. Attached are a
couple of shots of our 24 inches --- what a mess! Fortunately yesterdays
storm passed south of us and into the Atlantic.

I just finished a reduced size replica old timer that might interest you. It
is Chet's AIRBORN, done at 200 square inches and weighing just 6.8 ounces
with 17 watts input power. This was scaled down from Jim O'Reilly 1/2A
Texaco plans and will be in the March issue of RC MICRO WORLD. This is the
fourth in my series, previously I did the PLAYBOY CABIN (which is now
available as a kit), Lanzo BOMBER and Gil Morris' KERSWAP. We are hoping to set up
a nationwide postal contest for this size old timer aircraft.


Bob Aberle

ParkZone Sukhoi Su-26m

Baseball fan making a nuisance of himself with a bind & fly model from
Horizon Hobbies.



FWIW, the reason an ARF is featured on this site is because it's a useful and funny reminder of what non modelers think of our "toys."

Tandy's Jenno .29

Good Morning Thomas,

While I am waiting for the Sailplane graphics to arrive, I started cycling transmitter, receiver, and ignition batteries and I also changed out one engine yesterday. I have been using a Shilen Torpedo .29 ignition engine in the Class B Airborn since it was initially built. However, last year in a discussion with George Tallent out in Arizona, George said I should pick up a Jenno Torpedo .29 because they would outperformed the Shilen engine. Well, I did locate a Jenno Torp .29 (S/N 337) and bought it. I sent the engine to Bob Beecroft out in California who is not only a free flight modeler, but a good machinist as well. He drilled the three threaded holes that hold the backplate on crankcase all the way through the crankcase so the engine could be radial mounted as shown below.

I removed the rear mounted tank, changed out the needle valve assembly for an fine thread Enya needle valve assembly, and installed the Jenno Torp .29 in the Airborn as shown below.

The up and coming flight tests will be used to check out the Airborn's new Futaba FASST 2.4 gHZ receiver as well as evaluate the performance of the Jenno Torp .29........................Tandy