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Old 07-02-2002, 01:16 PM
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Old 07-02-2002, 01:37 PM
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Gastronom,

I bult one of these years ago. It flew very well on an OS .46. I think the prop was a 10 x 7. I think a 10x8 is too much for a regular .46. This plane was not designed for speed. If you want to go faster contact Dub Jett for more powerful engine.

Mark M.
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Old 07-02-2002, 02:17 PM
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What are the RPM's? But non of those props look right for a 6 lb moderately fast plane. I would suggest 11-5, 10-7, or 10-6.
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Old 07-02-2002, 03:18 PM
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I probably would not use above a 10 X 7 prop on an asp .46. We had one of these models many years ago. It flew ok once you got it off the runway which was always a challenge.
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Old 07-02-2002, 03:52 PM
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I have one that hasn't been built yet....I was planning on putting an Thunder Tiger Pro .46 on it.....now I'm wondering about that combo.....
Gastronom, what about an OS .50 SX? I think it's the same size as a .46

Mike
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Old 07-02-2002, 04:02 PM
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I was TRYING to fly one for a friend at the feild! We couldn't even get it to take off! So I had him put bigger wheels and it still couldn't take off.

He had a fox 40 on it. It seems like it needs a 61 fx or something.
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Old 07-02-2002, 04:18 PM
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Default GP-F15

Guys,

This plane will fly fine with a .46. Once again it isn't designed to be very fast. If you are having trouble on take off (especially on grass) it is more likely due to the weak wire gear that has a tendency to bend reaward. Also, many don't make the nose high enough. You should have at least 2 degrees of positive incidence.

On take off let the plane build a little speed before feeding in up elevator.

Mark M.
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Old 07-02-2002, 11:35 PM
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I have an F 15 that has an OS 46 on it and it moves along just great. I have never had trouble with take offs or landings. It is a great plane. It sounds as if your 46 is not putting out all the power that you need. The 46 should be enough. Good Luck, Dave
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Old 07-05-2002, 12:21 PM
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Well I can't very well give up on this beautifull beast, but I may try that .50 engine sx that 'gowplug' mentioned. I mean I can fly it, looks great in the air, just not as fast as I would hoped it would be. I do use the entire runway and then I have to push it in the air at the end of the runway, but geez that seems risky.
We did tach the engine but, CRS climbs on my back every so often. I'm thinking tha tI should try taking off on the road or something like that , still If it does the same speed in the air, the take off doesn't really mater much. When I turn right or left, the airplane seems to fall a good 10 feet between turns. Just a lil spooked about it, being my x-mas gift in all.
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Old 07-05-2002, 03:24 PM
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Put a tuned pipe on it, makes all the difference in the world. A buddy has one and it wouldn't get up in less than 250 feet with a OS.46 SF, put a pre tuned pipe from Mac's on it, now it gets up in 100 feet and has good top speed.
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Old 07-05-2002, 04:05 PM
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Kewl David, I had a friend named 'David' from carrolton tell me the same thing. What dimensions will be needed when searching for a header? would that be bolt to bolt or inned diameter of the exhaust port??
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Old 07-05-2002, 06:13 PM
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You can buy a pre-tuned pipe and header as a package deal, check with your local shop or Tower Hobbies. If your looking for a used one, bolt to bolt dimension is what your looking for.
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Old 07-06-2002, 04:34 AM
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I built one of these for a friend of mine (who waited 9 months before getting enough guts to fly it). He wanted a fast plane, so he got a Tower .75 for it. I read someone clocked one at 120 with a similar combination.

This plane is a rocket with that engine. He's faster than the ducted fan jets are plus it doesn't sound too bad either since he's afraid to give it full throttle. It still lands nice and gentle too (good thing because he used the Hobbico mechanicals (with a separate servo for the nosewheel).

I think a nice .60 would be more ideal for it. More power than a .46, reasonable take off distance, and if you balance it right, it shouldn't dive in turns. If it does add little bits of weight till it barely dives and you should be fine.
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Old 07-06-2002, 02:12 PM
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If you're willing to front the money, you can always buy a Dub Jett motor and go fast

Michael
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Old 07-06-2002, 03:52 PM
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An Irvine 53 is about as powerfull as a 61FX, with the same dimensions as a 46.
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Old 07-06-2002, 08:51 PM
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Those who fly similar planes here run Jett 50 or YS.45 with tuned mufflers or pipes. The 50sx is a great engine but if you run it with stock exhaust, your not going to be much better off.
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Old 07-09-2002, 04:22 AM
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Great advice above... I to think the Irvine 53 would work well (mounts the same as most 46's..) but ALOT of power!

If you have a few extra bucks:

YS 45
Jett 50
Rossi 45
Webra speed 50

Anyhow, keep us posted!

james
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Old 03-03-2003, 03:11 PM
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Default Finally returned to the project

Well last night I removed the .46, found out that carb body was split and leaking air. I was going to put the new TT .61 Pro on it without any mods but that just isn't happening. I cut the nose off about 1/2" away from the firewall and have been sanding down to it. I plan on using a plywood doubler to create a nbew extension to the firewall. Another modification that I have done isto create a hatch to the fuel tank area, so I can re-work tank and also reach the blind nuts for removal and installation.

I will post pics later this week if at all possible. Anyoe out there have a y experiences with putting an oversized engine on one of these? Anything to watch for other then COG and firewall beefing???
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Old 03-03-2003, 04:57 PM
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Default GP F-15

Mine flew OK with an OS 46SF. It takes a lot of runway any way you go. Then I got a Performance Specialties Ultrathrust Muffler. It was like getting a new plane!!! I went from getting 2 vertical rolls before it fell off to almost 5. Looking back, I think the OS 50 SX would have been the perfect engine for this plane.
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