Goldberg Sailplane

Restoration complete. For some reason, the Oracover looks wrinkled in the photo but is smooth in person.

Goldberg Clipper

 

Tandy's Sailplane at the Concours

The magnificent Goldberg Sailplane.

I received this picture yesterday a fellow modeler that took this picture of my 1940 Comet Sailplane at the Society of Antique Modelers (SAM) Concours event in Muncie, Indiana, last Wednesday evening. My competition results are shown below.....................Tandy Walter- Arlington, TX

Final Test Flight of the Comet Sailplane

I met George Grant at the Planesman's field around 7:00 a.m. this morning. It was a great morning, clear, around 80° and dead calm, but the wind sock was oriented for a NE wind direction. The engine went rich in the power climb on first flight and the Sailplane was brought down.

The engine was leaned out about a 1/4 turn on the needle valve and the Sailplane was launched again. The engine was screaming all the way up the power climb, but I got "gun shy" as the image of the Sailplane grew smaller and I cut the engine prematurely around 29 or 30 seconds. The duration of this second flight 7 min 13 sec.

About half of the down trim was used in the power climb and most of the up trim is used in the glide. The Sailplane transitions well and really glides beautifully with no bad handling tendencies that I could detect. Once trimmed, the Sailplane is as steady as a rock and with no tendencies to roll off to either side. The turns are smooth and the model recovers almost hands off. Also the model did not try to stall or porpoise.

On the third flight, the needle valve was not touched. Again the engine ran extremely well (at peak rpm) during the power climb. The Sailplane stayed in the groove all the way up for the full to the 35 sec engine run. I chopped the throttle at 34 sec and the McCoy 60 cut off at exactly 35 sec. Again the Sailplane transitioned smoothly. The elevator trim was adjusted and a flat glide was established with a heading into the NE. In the early morning air, the Sailplane just seemed to hang there motionless. No particular control was necessary as the Sailplane was truly in a free flight mode. As my good friend Dick Huang used to say, "Just park it up there Tandy until you get your Max and then bring her down and we'll do it again" ! The flight time on this third flight was 9 min 7 sec and that is a Max in dead air. With any lift at all, this Sailplane will have no trouble staying up 15 min or more. Guys, it has been a long time coming, but at last the Sailplane is now fully flight tested and ready for the 2010 SAM Champs, thanks to George Grant's help.

By the way, George took some really good pictures this morning that I want to share with you all..........................Tandy Walker

The Sailplane at the Top of the 35 sec Power Climb

Coming Down Some, but Still Quite High

Gliding Smoothly During the Descent

Overhead Pass for George's Picture

A Focused, but a Most Pleased Pilot

Down Wind Leg

Initiating Turn on Final

Lining up with the Runway

In the Approach the Glide Speed is Unbelievably Slow.

This is a Close Up of the Sailplane from the Picture Above

Starting to Flare about Four Foot off the Runway

This is Really a Great Close Up of the Sailplane Taken from the Picture Above

(It is hard to Describe Just how Smooth and Stable the Sailplane is.)

Will the cowl go back on at this point?

Flight of the Goldberg Valkyrie

An electric old timer built by Franny Brodigan.

Goldberg Sailplane videos

We're still waiting on Tandy Walker's Sailplane. In the meantime, here are some built by other modelers.

159 Sailplane Today's Progress on the Final Assembly

Report #159 from Tandy Walker on the construction of his Comet Sailplane for the 2009 SAM Champs in Las Vegas

Comet Sailplane Project

The picture below shows the integrated ignition unit consisting of (1) a 750 mAH NiMH battery pack, (2) a ModelElectric coil, and (3) Marv Stern's Aero Tech IGN-SW ignition module installed on the back side of the Sailplane's firewall with two 2-56 cap screws. You can see the (+) ignition pack charge terminal and the (+) booster terminal wires with lugs soldered to their ends. In addition, the landing gear has also been installed.

With the two wire lugs attached to the terminals on the back side of the hatch cover, this picture shows the two external terminals and the hook up for charging the ignition pack and attaching external booster batteries (note that the landing gear wire is grounded to the engine).
The green wire in the picture below is the landing gear's ground wire to the engine for the booster and ignition pack charge grounds on the landing gear shown above. I was doing a continuity check with the multimeter that you see in the picture.

This picture shows the ignition unit's ground and point wires. Notice that the high tension lead is too short to be routed up through the cowl and to the spark plug.

So I started making a new high tension lead. Larry Davidson sells the clip shown below that snaps onto the coil post. Years ago Dick Huang gave me bunch of very small aluminum brads that I use to attach the high tension wire to the coil clip. About a 1/4" of the insulation on the high tension wire is removed and the stranded wire is bent through the hole in the coil clip. The aluminum brad is also pushed through the hole and then flared out, which attaches the high tension wire to the coil clip. Black heat shrink tubing is used insulate the connection as shown below.

James Lollar is sending me some 1K and 10K resistors to use inline with the little spark plug clip that I make, but they have not arrived yet. I will probably use a 10K resistor and locate it as close to the spark plug as practical. Well, that it for today.........................Tandy