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Old 01-02-2007, 01:28 AM   #1
Franny
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Smile 1/2A Blazer Conversion!

Hi All,

I am waiting for a bonus from work to finish me .40 size Taube, so I thought I would take a bit of time and build that 1/2A Blazer I've had for a while. For those that aren’t familiar, the Blazer is an old Goldberg free flight kit from the late 60'-early 70's designed for .049. I built a couple as a kid, but never flew one. I have had great success with my 1/2A Viking (also a Goldberg free flight kit) which I electrified and converted to RC so I've been itching to try my hand at the Blazer. I just finished it today and I thought I would share some photos. I'll have to wait for a little warmer weather here in Denver to melt a bit of the snow before I can maiden it, but all checks out so I'm betting it will go well.

The construction was pretty simple and very "Goldberg". My biggest concerns were battery placement, servo placement, access to both, and most of all, balance. the balance is a bit complicated on these FF jobs because of the lifting stab, their short nose and long fuselage. The plans called for a balance point about 2/3s of the way back from the leading edge - super far back. The Viking's balance point is actually behind the point on the plans and still flies great! I believe the model compensates by changing it's speed which is the other factor in the balance. With a non-lifting stab, the speed doesn't affect the balance point, but with these guys, the balance is speed dependant and therefore, I think, a little less sensitive actually. At any rate, the fuselage is so small, that there are really only a few possible configurations for battery and servo placement and access. I am running an E-Flight 370 outrunner with a CC ESC and a three cell 900mAH lipo. This is the same power system on the Viking which is a tad thin on performance. It will get upgraded to a 400 motor and a 1350mAH lipo very soon.

Here are a couple photos of the construction including the horizontal stabilizer with its split elevators. As with the Viking, the hinge line for the two elevators are not co-linear so I had to run two control rods; one for the right and one for the left. I hinged the rudder on the original glue line of the fin with thin plastic, pinned hinges. I also beefed up the dihedral braces using thin ply instead of the specified balsa and using super thin ply to brace the leading and trailing edges. I also sheeted the very center of the wing to protect it from the rubber bands that are use to attach it to the platform. Other than that, it was pretty much as the plans directed.

It was great fun to build and I was able to use spare parts and covering I had laying around so there was no cost outlay. The kit came from Ebay for about $20. I saw one go recently for about $35 They are getting a bit more rare so they may get a little more expensive. The original price was $6.95 I think.

Let me know what you think!

Thanks,

Franny


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Old 01-02-2007, 01:49 AM   #2
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Default And here are the finished photos...

Here are the finished photos. As with everything, I am too much of a wimp to use LiteSpan or actual tissue or dope so I used some MonoKote I had. There are also a couple with her big sister to give you a relative size difference. Can't wait to see her in the air!!!

Thanks,

Franny


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Old 01-02-2007, 03:22 AM   #3
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Default Goldberg Rules! Blazer for R/C

Hi Franny, Great job on the "Blazer"! Looks like it's ready to "Max" out. Nice work on fitting the servos and battery inside, looks clean. The red and yellow should show up well for visibility.
Is that snow in the backround? LOL!
I'm still looking for my car, there's this...shape...in my parking space, sorta' car-like but much bigger.
Ron
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Old 01-02-2007, 05:40 AM   #4
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Default

Thanks Ron! Can't wait to see it in the air. Maybe we'll have a little green instead of white at the field this weekend... We have snow piles over five feet! I'll get that guy who was dreaming of a white Christmas...

Franny
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Old 01-04-2007, 04:03 AM   #5
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Default

Nice job. I built and flew the 1/2A Viking... I thought... but now I'm confused. I was about 13 or so and that was 38 years ago. Maybe it was the Blazer. Are they both for .049?

Mine was a green color iron on film with gold trim as I recall. We got several flights with DT but eventually it flew away, never to be seen again!

Yours are beautiful!

Tom
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Old 01-04-2007, 04:52 AM   #6
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Default

Thanks Tom! Both the Blazer and the Viking are .049, but I would think that the Viking is more "TD.051" where the blazer is more "BabyBee .049". That is why the Viking is being upgraded to the E-Flight 400 whereas the Blazer has the smaller E-Flight 370 motor. The Viking is a real joy to fly and has a look that you just don't see very often. I can't wait to see the blazer in the air... I'm sure it will be just as neat!

Thanks,

Franny
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Old 02-27-2007, 09:19 PM   #7
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Default Maiden Flight

Hi All,

Well, the blazer went out for it's first flight. Well,... It was pretty nutty and ended up going nose in into the snow from about three feet. No real damage. It was a bit unstable and possibly a bit tail heavy. Also, I think the power was a bit too much for it. So, since I do have a throttle, the latter is easily remedied. Not being easily discouraged and seeing the great potential even if the blazer couldn't, I went for a second attempt. This time at 2/3 throttle and a bit more down trim. Much better! It still rocked a bit, but it climbed out well and at about 200' or so I shut down the motor. Boy does it float!! Not a lot of thermals here in Denver when the air temp is right about 40deg and the field is white. None the less, it just floated and floated! Really neat to see. So, at this point I think I will try a little spacer at the trailing edge to lower the incidence a tad. Things are a little more complicated with that lifting stab, but it won't take long to straighten out the trim issues. It sure was really neat to see in the air! I've built a couple, but this is the first I've seen fly. Nice and easy to get into the car too.

I'll get some photos next time...

Thanks,

Franny
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Old 03-16-2007, 12:03 AM   #8
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I did the same thing with a Sal Tabi 1/2A Spacer. Used an Astro 01 brushless with the off set gearbox. Micro 05 receiver one HS-55 servo for a rudder tab Pushrod was a length of 6# test fishing line to the control horn with a small rubber band on the other side to provide tension. Used a 3-cell 730 li-po for power. Weighed 8.3 ounces ready to fly. Climbed just like the old free flight with a good Holland Hornet screaming away up front. The perfect flight was when I did not have to touch the transmitter until it was time to come in and land!

I lost the bird at the A.E.F 2006 when for some reason the antenna wire got hung up in the rudder tab. Spun in from about 200 feet. Still have the aft fuselage and 3 wing panels. Really want to rebuild it someday!
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