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Gas engine for Senior Telemaster

Old 10-10-2008, 03:04 PM
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iliveonlytocrash
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Default Gas engine for Senior Telemaster

I was thinking of putting a gas engine in a senior telemaster since I am converting all my glow models to gas. Has anyone ever used a gas engine on a trainer like this? Will the airframe hold up or will it shake apart? I was going to use a Zenoah G20EI.
Old 10-10-2008, 06:32 PM
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Kimhoff
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Default RE: Gas engine for Senior Telemaster

perfect
Old 10-10-2008, 09:33 PM
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Default RE: Gas engine for Senior Telemaster

Sounds like a match made in R/C heaven.

Karol
Old 10-12-2008, 04:44 PM
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Firebird25
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Default RE: Gas engine for Senior Telemaster

Flew my ST [arf, taildragger] with G20EI for the first time today. Both are brand new and I am only a relative beginner. Take off with 25% throttle w/some rudder correction required. Did not get beyond 1/2 throttle. Landing was uneventful, no floating. Idle was just right. It seems that the G20 is a good alternative to glow.
Old 10-12-2008, 10:10 PM
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Default RE: Gas engine for Senior Telemaster

As you get more accustomed to your model and develop some more confidence in flying it I'm sure that your enjoyment level will increase substantially, so continue to have fun and enjoy. By the way what model is an ST ARF taildragger and what prop are you using ?

Karol
Old 10-13-2008, 06:20 AM
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ljones5000
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Default RE: Gas engine for Senior Telemaster

Who sells the Telemaster?
Old 10-13-2008, 07:50 AM
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iliveonlytocrash
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Default RE: Gas engine for Senior Telemaster

Hobby Lobby

http://www.hobby-lobby.com/srtele-arf.htm

Senior Telemaster is an 8 foot wingspan trainer like aircraft. They also make a giant Telemaster with a 12 foot wingspan which I have considered building with a G62 engine.
Old 10-13-2008, 08:17 AM
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Default RE: Gas engine for Senior Telemaster

Guess I was having one of my now too requent brain farts when I enquired of your model []

Karol
Old 10-13-2008, 11:47 AM
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NM2K
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Default RE: Gas engine for Senior Telemaster

It's nice to have some company now and then, Karol. <G>

It's funny how over the years folks have forgotten that the Senior Telemaster was designed to string cable from mountain top to mountain top in Germany/Austria. Training was not on their minds when they designed this model. What always unsettled me about the model is how it flies tail high. This is normal because of the lifting horizontal stabilizer.

Now, if the Chinese (or anyone else) could come out with a lighter engine than the G20EI, we would be set. At a cheap price too.

I know that Saito has introduced another gas/petrol fueled four-stroke recently, but the price is out of sight. I have their FG-36 and I might end up buying their latest smaller engine (can't remember the danged displacement) that burns gas/petrol. A two-stroke 1.00 that weighs about as much as an OS.91FX (minus the ignition goodies) would be about perfect. Should have held on to my BME ST G90 conversion. That'll learn me. That would have been absolutely perfect for the Sr. Telemaster. I'm glad to hear that the Zenoah G20EI has worked out well. I love Zenoah engines too.


Ed Cregger
Old 10-13-2008, 01:00 PM
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arobatx
 
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Default RE: Gas engine for Senior Telemaster


ORIGINAL: iliveonlytocrash

Hobby Lobby

http://www.hobby-lobby.com/srtele-arf.htm

Senior Telemaster is an 8 foot wingspan trainer like aircraft. They also make a giant Telemaster with a 12 foot wingspan which I have considered building with a G62 engine.

We have one of these 12fters in the club, running the Fuji 64. Though it does fly, and will carry nice loads of candy...etc for the kids at airshows, if I were to build one, I'd up the investment up front to a good 80...
Old 10-13-2008, 01:27 PM
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Antique
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Default RE: Gas engine for Senior Telemaster

We built a 12 footer from the other company, maybe Bud Nosen...Used a stock mag G38..19 lbs with fuel....Flew VERY slowly...[8D]
Old 10-13-2008, 02:45 PM
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iliveonlytocrash
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Default RE: Gas engine for Senior Telemaster

Was the Fuji 64 underpowered for the giant Telemaster? What would you use it for to need an 80? I was thinking of using it to pull a banner and probably carry a camera. Also it would be my only slow flyer to let new comers use to train with.
Old 10-13-2008, 03:49 PM
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Default RE: Gas engine for Senior Telemaster

There is a heck of a lot of wing there, and its going to be a slow mover regardless. The telemaster wasn't ever intended to be a speedy one. Although we know a 38 thru 64 will fly it, it's going to be slow. The airframe can handle the 80 easy, and when flying airshows, dropping candy, taking video....whatever, you can get to altitude a bit quicker. Not so much by moving through the air faster, but by maintaing a steeper angle of attack. No, I wouldn't say the bird was underpowered with the 64....but I would recommed you watch one fly before you assume how its going to.....Something just makes me want to try one with the GT80

Old 10-13-2008, 03:56 PM
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Default RE: Gas engine for Senior Telemaster

Here are a couple pictures of the one in our club...you can see the beginning of many pounds of tootsie rolls (I can never remember how much it will carry in the bay), each with a streamer attached, exiting the plane
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Old 10-13-2008, 04:31 PM
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iliveonlytocrash
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Default RE: Gas engine for Senior Telemaster

How does this plane handle in wind (like 10-12 mph)?
Old 10-13-2008, 04:36 PM
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Default RE: Gas engine for Senior Telemaster

Are we talking about the Senior or the 12footer? I feel badly for squatting on this thread with the info on the big one....

We had gusts between 20-25 on airshow day, and though takeoffs and landings were a bit at the mercy of the wind, and weren't so pretty, it flew fine. We have a couple of the senior telemasters in the club as well, that also flew that day without problems.
Old 10-13-2008, 04:43 PM
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iliveonlytocrash
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Default RE: Gas engine for Senior Telemaster

I will probably end up building the Senior instead of the giant. It looks like the giant could turn into a real hassle to transport. The senior will fit just right in my van.
Old 10-13-2008, 04:45 PM
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Default RE: Gas engine for Senior Telemaster


ORIGINAL: arobatx

There is a heck of a lot of wing there, and its going to be a slow mover regardless. The telemaster wasn't ever intended to be a speedy one. Although we know a 38 thru 64 will fly it, it's going to be slow. The airframe can handle the 80 easy, and when flying airshows, dropping candy, taking video....whatever, you can get to altitude a bit quicker. Not so much by moving through the air faster, but by maintaing a steeper angle of attack. No, I wouldn't say the bird was underpowered with the 64....but I would recommed you watch one fly before you assume how its going to.....Something just makes me want to try one with the GT80

So thats what you wanted that GT-80 for???
Old 10-13-2008, 04:45 PM
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Default RE: Gas engine for Senior Telemaster

uh oh, they're on to me ya find one for me?
Old 10-13-2008, 04:53 PM
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Default RE: Gas engine for Senior Telemaster

Chaddie ole boy, you deserve whatever they throw at you for wanting to stuff a GT 80 into that poor little big plane.

Karol
Old 10-13-2008, 05:12 PM
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iliveonlytocrash
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Default RE: Gas engine for Senior Telemaster

Anybody have any idea what size and pitch prop to put on something this slow? It would be the senior telemaster with a Ralph conversion G26.
Old 10-14-2008, 08:28 AM
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Default RE: Gas engine for Senior Telemaster

APC 17x6, 16x8....Xoar 17x6, 16x8.... or Mejzlik 18x6 carbon. If NX makes a 17x6 or even an 18x6, I'd try that. The NX props have really impressed me lately, they pull hard, are pretty quiet, cost less than carbon props. The APC and Xoar will work pretty well, but nothing like the Mejzlik, and I am finding the NX performing close to how carbon props do, but at the cost of a good wood one. Match your engine with an exhaust/prop combo that will let the engine settle in at around 9000rpm, where they are happy. The props listed above, with any decent aftermarket in cowl exhaust will get you there, or at least close.
Old 10-14-2008, 09:11 AM
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karolh
 
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Default RE: Gas engine for Senior Telemaster

NX prop sizes start at 20" dia. and up.

Karol
Old 10-14-2008, 09:26 AM
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Default RE: Gas engine for Senior Telemaster

That's too bad....they appear to be a really good one. Hey Karol, weren't you experimenting with some different brand props a while back? I recall you asking for a distributor, or something. I don't recall how that turned out.
Old 10-14-2008, 05:39 PM
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Default RE: Gas engine for Senior Telemaster

I had tested some 16" dia Hawk beech props from Hobby City on my G20 which were quite nicely done, well balanced and very low priced, but unfortunately their good looks did not translate into good performance. In comparision to same sized APC and Xoar props they were down about 400 max rpm and their flight performance was about similar to a MA or Zinger, nothing to write home about.

Karol

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