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Air Hobbies 50cc/3.0 twin

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Old 10-14-2011, 01:14 PM
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Steve S. Helland
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Default Air Hobbies 50cc/3.0 twin

Greetings,

AIR HOBBIES TWIN 3.0 CU/IN.

This engine runs awesome, I have taken very good care of it, seals replaced...IT KICKS BUTT!. I HAD IT ON AN 84" WINGSPAN staudacher g-300 and now the airplane is gone. I was wondering what you guys thought I should put this engine into? I want to build something from plans and break in my new vertical bench top band saw. I was thinking along the lines of a golden classic, or maybe a warbird with retracts. Or maybe just a large sporty bird? This engine swings a 20-10 through 22-8 propellor. It is lightened up from the stock configuration as you can tell in the pictures, lighter exhaust cans are custom welded and the original standoff mounting system removed and lightened aluminum plate installed instead. The whole package engine weighs in at just under 3 pounds with ignition (no battery). Custom C H custom ignition with conversion down to 10mm CM-6 plugs gives this engine a horizontal footprint of 9" (total width plug cap to plug cap). History: Many of these were built and manufactured in the USA. Two Sachs-Dolmar 25cc cylinders were utilized with Boxer style stroke. (Both pistons hit top dead center at the same time...reduces vibration).

I think that's enough classified info. I would appreciate feedback on this matter. Please stay focussed on the objective.

"Whilste the nose is pointed south, thou shalst reduce thy power before earth rises up to smite thee"
Sincerely,
Steve H.
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Old 10-14-2011, 05:10 PM
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Default RE: Air Hobbies 50cc/3.0 twin

You deffinately get cool points for this engine. A 50cc under 3 LBS that is not a DA? And it's a twin cyl? Me thinks your scale is broken Just kiding. If you went warbird you would want a round cowled model such as a Corsair or maybey a Thunder Bolt. I have always liked the P-47 Razor Back model. You just need to find one with a 9+ inch cowl. If your into aerobats then a Yak or a Sukoi might work for you as well.
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Old 10-15-2011, 08:18 AM
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Steve S. Helland
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Default RE: Air Hobbies 50cc/3.0 twin

Yep,
That is exactly the info I need: What kit or plans have round cowls that are 9"+? Say 82-84" WS, 17-22 Lbs?
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Old 10-15-2011, 11:59 AM
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Default RE: Air Hobbies 50cc/3.0 twin

looks kool , looks like a block of alu with two jugs on it.
never knew they made a 3.0 twin
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Old 10-15-2011, 04:11 PM
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Default RE: Air Hobbies 50cc/3.0 twin

Do a little research....you will find....AIR HOBBIES RIPPED OFF A LOT OF CUSTOMERS. Sorry but true!.............
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Old 10-15-2011, 04:27 PM
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Default RE: Air Hobbies 50cc/3.0 twin

I had a very disappointing experience when I purchased a new engine from their booth at the Toledo show. Never was able to get it to run good enough to put it in anything. Absolute lack of support. Ended up being an expensive door stop. I would not recommend them as a sinker maker much less an engine manufacturer.

Dennis
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Old 10-15-2011, 06:48 PM
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Steve S. Helland
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Default RE: Air Hobbies 50cc/3.0 twin

Yes,
But this engine hauled around a 19 lb Staudacher very nicely! Albeit after replacing the seals which seemed to be damaged during assembly, new seals are still available. However, it still runs excellent! It's favorite propellor is a Bolly carbon 21-10. I know Bolly is out of business but a suitable mejzlic, or pete's will do.
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Old 10-15-2011, 06:51 PM
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Default RE: Air Hobbies 50cc/3.0 twin

The objective question still remains...Who knows what plans have a round cowling that is around 9" in diameter?
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Old 10-15-2011, 07:13 PM
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Default RE: Air Hobbies 50cc/3.0 twin

ORIGINAL: Steve S. Helland

The objective question still remains...Who knows what plans have a round cowling that is around 9'' in diameter?
Check out this site: uncle willies plans.com/gpage.html (take the spaces out betwen the words...RCU is blocking the url
He has plans for almost anything with wings. When you order from him he sends you the plans in an email and you can take them to Kinkos and have them printed in any size you like. Then you send them to a laser cutter and have a short kit cut for yourself.... Unless your a masacist and want to cut all those formers and ribs yourself[:'(]
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Old 10-16-2011, 09:17 AM
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Steve S. Helland
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Default RE: Air Hobbies 50cc/3.0 twin

Yes,
That's what I do...I cut my own kits. I harass Fiberglass speciaties. (In the past, now they have round cowls available in all diameters.)
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Old 10-16-2011, 04:36 PM
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Default RE: Air Hobbies 50cc/3.0 twin

You should donate that engine to the Smithsonian museum. I think that's the only one that ever ran.....
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Old 10-16-2011, 05:34 PM
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Old 05-27-2019, 11:30 AM
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Default Questions about Air Hobbies engine

Hello, everyone, I know this is a very old thread, but it has some info I could not find anywhere else. I have found out that an old twin cyl engine I bought at a swap meet years ago was made by Air Hobbies, only because I put some blueing on it and the logo jumped out at me, had not seen it before. I have a few questions, #1, is this the original crankshaft ? When I got this engine the crank pin had come loose and I rewelded it. #2 Would a modern day crankshaft fit it , like a XYZ 53 twin ? #3 has anyone else put different cyls on this engine ? I really don't think I will be putting it on a plane to fly, but a running display would be cool. #4 Anywhere on the web I can go to and get some info on this engine

Had this engine for years but never saw this, it is very lightly stamped.


No counter weights is what I wonder about.
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Old 05-27-2019, 05:18 PM
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Appears to have been run hot?
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