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Sig four star 60 engine choice.

Old 07-24-2010, 10:02 PM
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warrenv
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Default Sig four star 60 engine choice.

I want to put a gas engine in my Sig four star 60. What would you recommend.
Old 07-24-2010, 10:14 PM
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Campgems
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Default RE: Sig four star 60 engine choice.

Well, if you figure a 1.20 four stroke is about equivlent to a 23cc gasser. you are going to need a 17 or 18cc engine. The 23cc gas is going to be way overpowered. The plane will fly very nicely with a 70 four stroke, and will do about anyting you could expect with a 91 four stroke. And, this is bound to cause some response, it won't sound like a wead eater that isn't running very well.

Don
Old 07-24-2010, 10:15 PM
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Default RE: Sig four star 60 engine choice.

Gas or glow?? A .61 two stroke glow will fly the plane OK but it will also take a .75 or .91 two stroke. 100 Four stroke is another great choice. There are a couple of new small gas engines but you will have to go into the gas engine forum and read up on what users are saying about them to get an idea of how they compare to glow engines to get a good idea.
Old 07-24-2010, 11:20 PM
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noveldoc
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Default RE: Sig four star 60 engine choice.

These planes love a 4 stroke with a big wood prop.

I am planning an OS 72 in my Venture 60, very similar plane.

Tom
Old 07-25-2010, 04:58 AM
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Default RE: Sig four star 60 engine choice.

I used a Super Tigre .90 on mine. The logic being that this engine is the same size and weight as many engines in the .60 - .70 range, and so there was no wieght penalty for the extra power.

If you want a gas engine, as apposed to glow then you could consider BME Super Tigre .90 gas conversion - [link=http://www.bmeengine.com/engines.htm]http://www.bmeengine.com/engines.htm[/link].

I don't know how it performs but there are some post on here and other forums about it.

Apparently it can run at full throttle for 3 mins and only burns an ounce of gas! So you'd pay for it pretty quick over burning glow.

Good luck.
Old 07-25-2010, 09:09 AM
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Default RE: Sig four star 60 engine choice.

I had the 4 star 40 once and would be nice to have a larger version.. I've got a newer OS .61? but it sounds like this wouldn't be enough motor?
Old 07-25-2010, 09:37 AM
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Bill Diedrich
 
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Default RE: Sig four star 60 engine choice.


ORIGINAL: KitBuilder

I had the 4 star 40 once and would be nice to have a larger version.. I've got a newer OS .61? but it sounds like this wouldn't be enough motor?
Your OS 61 is plenty power for the 4-Star 60, mine is powered with a ST61 swinging a 12-6 MA prop with a 3" spinner and has ample power,
however if you are building one from a kit many shorten the wings buy chopping the last bay off, gives it a whole new attatude. I've also
seem guys chop the wings of the ARF version also with sucess.

Bill D.
Old 07-25-2010, 09:54 AM
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SeamusG
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Default RE: Sig four star 60 engine choice.

I've flown mine with both a Saito 91 and Super Tigre 90. Both fly the plane nicely.
Old 07-25-2010, 10:05 AM
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GaryHarris
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Default RE: Sig four star 60 engine choice.

Just remember that the 4*60 builds very tail heavy. I used a Saito 100 in mine and still had to add 15oz. of lead to the nose but it flew great! IMO, 2 strokes don't belong in four stars.
Old 07-25-2010, 10:26 AM
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SeamusG
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Default RE: Sig four star 60 engine choice.

My 4*60 w/ the ST90 mounted carries no additional weight. The ST90 weighs 28 oz. while the Saito 100 weighs 21 oz. (both weights are mfg. published with OEM mufflers).

I've noticed that SIG kits are shipping with very dense (hard and heavy) balsa. On an LT-40 I removed 3 oz. of weight from the tail by building with lighter balsa. If the 3 oz is 3 feet behind the CG and the firewall is 1 feet in front of the CG it will take 9 oz. at the firewall to counter the heavy tail. If your 4* has a heavy keister and has a 4-stroke I can easily see Gary's 15 oz. of lead to balance.

Bottom line - the 4*60 can handle an addition lb. and still fly nicely.

Gary - I'm just jealous of people that fly at sea level - can you say "horsepower"?
Old 07-25-2010, 10:52 AM
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Default RE: Sig four star 60 engine choice.

ORIGINAL: SeamusG

My 4*60 w/ the ST90 mounted carries no additional weight. The ST90 weighs 28 oz. while the Saito 100 weighs 21 oz. (both weights are mfg. published with OEM mufflers).

I've noticed that SIG kits are shipping with very dense (hard and heavy) balsa. On an LT-40 I removed 3 oz. of weight from the tail by building with lighter balsa. If the 3 oz is 3 feet behind the CG and the firewall is 1 feet in front of the CG it will take 9 oz. at the firewall to counter the heavy tail. If your 4* has a heavy keister and has a 4-stroke I can easily see Gary's 15 oz. of lead to balance.

Bottom line - the 4*60 can handle an addition lb. and still fly nicely.

Gary - I'm just jealous of people that fly at sea level - can you say ''horsepower''?
When you consider the 98% humidity we have here, it's like being underwater. lol
Old 07-25-2010, 11:01 AM
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Default RE: Sig four star 60 engine choice.

Hey Gary - you get used to it - right? It only took me a year to feel "good" in a wool suit in Houston!
Old 07-26-2010, 09:41 PM
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jship
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Default RE: Sig four star 60 engine choice.

I used a Super Tigre .90, it would knife edge all day long. Add 3/4 to one inch to the rudder. I would not cut any bays off. I loved mine!
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Old 07-27-2010, 11:37 AM
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Default RE: Sig four star 60 engine choice.


ORIGINAL: KitBuilder

I had the 4 star 40 once and would be nice to have a larger version.. I've got a newer OS .61? but it sounds like this wouldn't be enough motor?
I just finished teaching a person to kit build not long ago, I think I posted photos of his build and wrote about the maiden. It was a bone stock 4*60 with the OS .61. The .61 is just fine and will fly the plane very well. It just depends on what you want to do with the plane. The .61 will pull it into a huge loop from level flight but there isn't a lot of extra power if you want to go a little nuts with the plane. For the owner of this plane it is perfect, for me it was a tad under powered but I tend to like the .91 two stroke, in this plane, I haven't ever tried one of the .75s but that may be another good choice? I too like four strokes and the .91 or 100 is the engine I have used several times. The 100 seems to be the engine of choice in my area. There really isn't anything wrong with the OS .61 though. If you have the engine then go for it. It will fly the plane very well.
Old 07-27-2010, 04:06 PM
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tarvma02
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Default RE: Sig four star 60 engine choice.

I have a Thunder Tiger 130 on my Four Star floatplane. It has ample power but I would prefer a YS 1.40 on floats. I'm sure it is a ballistic missle without the floats but I've never taken them off. For weighing 13 lbs with fuel full, I'm shocked how aerobatic she is and well this airplane flies. You would think a 13lb 4 star would be a pig but that's not the case. Best flat spinner I've ever flown with crisp rolls, snaps, knife edge, etc. Really flies nice. The wing loading is perfect for acro at this weight.

Mike
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Old 07-27-2010, 04:08 PM
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Default RE: Sig four star 60 engine choice.

That a cool 4 star.
Old 07-27-2010, 05:02 PM
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Default RE: Sig four star 60 engine choice.

four strokes just arent very heavy , if you need nose weight
Old 08-09-2010, 09:23 AM
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Default RE: Sig four star 60 engine choice.

St .90, shorter wings and huge elevators and rudder will do the trick.A really fun airplane.

See pictures..
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Old 08-09-2010, 11:15 AM
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Default RE: Sig four star 60 engine choice.


ORIGINAL: WhiteRook

four strokes just arent very heavy , if you need nose weight
?????????????????????????????????????
Old 08-09-2010, 07:12 PM
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Default RE: Sig four star 60 engine choice.

in the .90 to 120 size
Old 08-09-2010, 07:42 PM
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LargeScale88
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Default RE: Sig four star 60 engine choice.

If you like gas with a four stroke sound, maybe check out Saitos gas engine lineup. I have the FG36on a plane and it saves me $$$$$ ($2.80 to $20.00 for glow fuel). It runs very well, only one deadstick after probably about 25 flights because I ran out of gas. They are quite a little engine.
Old 08-09-2010, 07:56 PM
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Default RE: Sig four star 60 engine choice.


ORIGINAL: WhiteRook

in the .90 to 120 size
comapred to what type or make of engine??
Due to the cost of the Saito gas engine {I'm just guessing but that seems to be what has been mentioned at the field} I still haven't seen anyone with one of there gassers. That is a big outlay of cash for just a sound. I'm still waiting to see one though. With all the nice running engines that have come out of China I doubt I ever will though but I keep hoping. I'm still looking forward to seeing some of the new small gassers too.
Old 08-09-2010, 07:57 PM
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Campgems
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Default RE: Sig four star 60 engine choice.

I've flown two 4*60s with a Magnum 91 four stroke. My prop of choice was an APC14x4W. You could lift off a go near vertical with that setup. The plane weighed in at around 9 lbs, including a half pound of nose weight. I would think more power would not be much better and could lead to some evil ground handling issues. I've got a Twist 150 with a Saito 180 in it and it is really way to much power. I know, there is a throttle stick in the TX, but my tendency is to get up flight speed then go full throttle before lift off.With the Twist, and a couple other over powered planes, that has presented quite a problem.

Don
Old 08-09-2010, 10:44 PM
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Default RE: Sig four star 60 engine choice.


ORIGINAL: Campgems

I've flown two 4*60s with a Magnum 91 four stroke. My prop of choice was an APC 14x4W. You could lift off a go near vertical with that setup. The plane weighed in at around 9 lbs, including a half pound of nose weight. I would think more power would not be much better and could lead to some evil ground handling issues. I've got a Twist 150 with a Saito 180 in it and it is really way to much power. I know, there is a throttle stick in the TX, but my tendency is to get up flight speed then go full throttle before lift off. With the Twist, and a couple other over powered planes, that has presented quite a problem.

Don
You big girl, I have an idea or two for that 180!!!! It's big and long, pink purple and white. ??????? Kinda sounds girlie doesn't it!!!!![&o] Just tested an APC 15X8 and plan on trying the 15X6 next time out. Road trip to NICE this week for stuff.
Old 08-10-2010, 02:13 PM
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Default RE: Sig four star 60 engine choice.


ORIGINAL: Gray Beard


ORIGINAL: Campgems

I've flown two 4*60s with a Magnum 91 four stroke. My prop of choice was an APC14x4W. You could lift off a go near vertical with that setup. The plane weighed in at around 9 lbs, including a half pound of nose weight. I would think more power would not be much better and could lead to some evil ground handling issues. I've got a Twist 150 with a Saito 180 in it and it is really way to much power. I know, there is a throttle stick in the TX, but my tendency is to get up flight speed then go full throttle before lift off.With the Twist, and a couple other over powered planes, that has presented quite a problem.

Don
You big girl, I have an idea or two for that 180!!!! It's big and long, pink purple and white. ??????? Kinda sounds girlie doesn't it!!!!![&o] Just tested an APC 15X8 and plan on trying the 15X6 next time out. Road trip to NICE this week for stuff.
I've been considering putting it in that mystery pattern that I have. Maybe I could take a ring or two of lead off the nose. Then take the 1.20 and put it in the Twist.

Don

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