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engine for a 4 Star 40

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Old 06-14-2003, 05:52 PM
  #1  
chrisdodge65
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Default engine for a 4 Star 40

I'm trying to decide which engine to install on my 4 star 40.I have an OS 40FP and an OS46FX.Does anyone have a 46FX in thier 4 Star?
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Old 06-15-2003, 01:43 AM
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CP140
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Default engine for a 4 Star 40

Yes...I've got a 46FX on mine...lotsa power...won't need full throttle for anything! Mine has 3 flights on it...one of the club instructors took it off for me the first two times(I've just graduated(?) from a trainer and wasn't feeling very adventurous!) ..I landed it once... and today I took it off and landed it. I did find I had to add about 2&1/2 ounces of lead to the tail to get mine to balance...might have been able to get away with less with moving the battery back more
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Old 06-15-2003, 01:55 AM
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Gene Chernosky
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Default engine for a 4 Star 40

The bushed .40 will power it just fine, just don't expect blazing aerobatics with it. OTOH, the BB .46 will make a rocket out of it and allow you to do just about anything you can throw at it. Either way it is set-up, it is a great plane to fly and have some fun...that's what you're doing this for isn't it?
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Old 06-15-2003, 07:32 PM
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CP140
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Default engine for a 4 Star 40

One suggestion... replace the bolts holding the landing gear on with nylon ones... had a trip into the "rough" today!
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Old 06-15-2003, 07:56 PM
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jmulder
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Default engine for a 4 Star 40

Id go with the 40. The 46 will probably cause flutter...................John
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Old 06-15-2003, 08:42 PM
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Default engine for a 4 Star 40

I put a TT .46 PRO on mine and it flew great!!! The .46 FX will fly it real nice as that's what I have seen on most of them at the field, and no problems with the controls. I built one for a friend with a ST .40 and this engine really scooted it around but it's not a bushed motor like the LA is.
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Old 06-15-2003, 10:12 PM
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Default Power for 4-Star 40

There is more to consider than the engine size. There is also throttle control and prop size.

If you have progressed to where you can fly around along, land and do a little acro, I would recommend the .46FX with a few exceptions.

Certainly, with the right prop, you can get a good bit of straight line speed and, depending on your control hook up, you might get flutter. If you do go with the big engine, keep an ear out for the fatal buzz and watch your throttle.

As for prop size, I like climb myself instead of speed, so I like a lower pitch prop. You might try an 11-5, 11.5-4, 12.25-3.75 or 12-4 on your .46, if your gear is long enough. The latter 2 will give you great climb on a .46.

Another thing you need to do when you start flying powerful planes is to upgrade your control system. I am talking about 4-40 rods and clevices and sealing the hinge lines.

The OS .40FP will fly your plane and if you are still not sure of your skills or your reflexes are slow, it might be a good choice. It is an older engine and I think you might out grow it. If you wanted a plain bearing engine, I would recommend a Thunder Tiger .42GP.

Another choice is to start with the .40FP, but make sure your motor mount can be expanded to fit the larger .46FX. In this case, I would switch motor mounts to the Great Planes expandable motor mount, .40-.60 size. You can squeeze it in for the FP, then later widen it for the FX. I don't recall anyone else supplying this type mount with their kits, so if you start with the narrower engine, you might be stuck with a more complex job to upgrade.
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Old 06-15-2003, 11:11 PM
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Default engine for a 4 Star 40

I would recommend that you try a Tower Hobbies 75
http://www.towerhobbies.com/products/towg0175.html
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Old 06-15-2003, 11:58 PM
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big max 1935
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Default engine for a 4 Star 40

For a more powerful 40 range engine I would add some more hinges, total of 4 on rudder, 6 on elevator & 5 each on ailerons . A .75 engine on a 4*40 ? , some ones sniffing glue on that one! MAX H.
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Old 06-16-2003, 12:09 AM
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Default engine for a 4 Star 40

Supre Tiger 51 and APC 11x5, awesome combo.
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Old 06-16-2003, 12:12 AM
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Geistware
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Default engine for a 4 Star 40

Hey, the wing area will support the weight and the throttle can be used to fly it at whatever speed. You will only add 8-10 oz to the total weight but will have an engine that will run great. I have seen people put .52ci 4 strokes on them and the weight is about the same as a 2 stroke 75.
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Old 06-16-2003, 12:14 AM
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big max 1935
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Default engine for a 4 Star 40

What ever . MAX H.
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Old 06-16-2003, 02:16 AM
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Gene Chernosky
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Default OK...you're one of 'those'

Originally posted by Geistware
Hey, the wing area will support the weight and the throttle can be used to fly it at whatever speed. You will only add 8-10 oz to the total weight but will have an engine that will run great. I have seen people put .52ci 4 strokes on them and the weight is about the same as a 2 stroke 75.
Yea, and a ST 3250 will fly a brick, too. Get real here! Overpowering an airframe just because you can makes NO sense! An airplane flies and performs MUCH better when it is built and powered light and set-up for the pilot's needs/experience. A .75 2S would make a GROSSLY overpowered 4*40. You sound like a guy at my club who likes to build plane ENTIRELY too heavy then justify his building by putting a huge engine on the plane just to make it fly. Someday maybe you'll get the idea, until then I guess you're just
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