DuBro Tri-Star Helicopter

Click here to see the Enstrom fuselage installed on a Tri-Star frame.

My first R/C helicopter was a DuBro Tri-Star, back sometime around 1976 (the year I graduated from high school). I think it was purchased through Tower Hobbies. Come to think of it, just about every mail order purchase I have ever made has been through Tower Hobbies, but that's another story. The Tri-Star was named so because it could be built with three different ABS plastic body styles: standard non-scale, Hughes 500, or Enstrom. Mine never got past the standard body, which was styled after the Scorpion home-built helicopter. If anyone has one for sale, please let me know; I'd like to reacquire one for the sake of nostalgia.

A Super Tigre .46 powered it (barely). The biggest pain was the centrifugal clutch. The clutch material that was on the inside of the bell housing had to be epoxied in place, and the darn thing never lasted for more than two or three flights before it had to be re-epoxied. The tail boom was very thin aluminum and easily creased when the tail would hit the ground. Although I never broke and blades, I spent a lot of time repairing the clutch and tail boom. I built a spider type training gear for it that consisted of five fiberglass arrow shafts and some whiffle golf balls on the ends. At the time, gyros for the tail cost about as much as the helicopter did ($200), so I never had the benefit of one. After learning to hover somewhat successfully, I dared to venture into my first deliberate forward flight. It took about fine hair-raising minutes to finally get it back into a hover where I could land. I remember that I was flying from the parking lot of a hotel that was next to a busy highway. More than once during that flight I was sure I was going to smash into a car (I don't think the drivers were even aware of how close I came to them). After that, flying was done at a school.

I went into the U.S. Air Force in November of 1978, and brought the Tri-Star to my permanent duty station at Robins AFB, GA, where it hung for three years but never flew. After getting out of the USAF, it was sold to some guy in Annapolis, MD, for about $100 (including the engine).
 
 

Shown below is a DuBro TriStar under construction in the winter of 2009. It is rare enough to find a TriStar kit these days, but to obtain one that includes the molded Enstrom fuselage is indeed an occasion worthy of celebration. This gem is being built by someone with a strong personal tie to the Enstrom Helicopter Corporation, and hopes to have it ready to fly in time for Enstrom's 50th anniversary. I will keep this page updated with photos as they are provided.

A Supertigre engine, and Futaba 2.4 GHz radio are being used.



 

While on the subject of DuBro helicopters, you might recall the Whirlybird 505. There was a man in my neighbor when I was a kid that had one, and I can remember running down the road to watch try to fly it when I heard the engine running. In fact my ears were tuned to listening for any of his engines running the way a mother is tuned to hear her baby crying. He used the tether method, but never got any farther than a pseudo-hover. My guess is that maybe 1% of all Whirlybirds purchased ever actually flew. The video tot he left is from a helicopter event in Dalton, GA, in September 2007.

 


To the right is a link to a video of the DuBro Shark 60 actually flying. I suspect a few more of them were successful than the Whirlybird.

If you monitor eBay, you will occasionally see these models come up for auction. Be prepared to shell out big bucks for them, though.






 













Webmaster: Kirt Blattenberger, BSEE, UVM 1989