hello all... i need some advise

i have a 4 star 60 that is not performing to my expectations with an o.s. max .61 sf . i want to put a big four stroke on it and need some help on the size. i am new to all of this and really dont have any idea what would be to big

the specs says .90 four stroke is the biggest they recommend for the plane. i am not looking for more speed really just alot more verticle

i was thinking about a 1.10 four stroke..

please give me your input on size and manufactuar

thanks alot .................................................. .......... cantw8tofly

the 1.10 is quite big (YS, I'm guessing)

I fly mine with a Magnum .91 4 stroke and it is great...
Had my Saito 1.00 in it for a while too... moved it to my Vectorflight edge 540...

the magnum pulls it very nicely.....

how was the verticle with the magnum?

I maidened a guy's 4*60 with a Saito .91 with an MA 14x6 in it. It performed pretty well, with enough vertical to *just* gain altitude in a hover situation. I'd say any .91 4 stroke will be a good choice with this airframe. It was a docile, predictable, gentle flyer - not really the sort of ship I'd associate with rip snorting "unlimited" vertical performance, at least with its standard wingspan.

Based on this experience, IHMO, fitting a YS 1.10 to this airframe would be a waste of a good powerplant.

I fly mine with a Saito .82 and it is quite adequate for me, I doubt that it will hover, but that's a non issue.

Mine flys very well with an OS91FS using an apc 14x6 prop.

I fly my 4*60 with an OS91 Surpass, APC 13x8 prop, Wildcat 15% Extra fuel. Will hover at about 3/4 throttle, but not quite enough to pull it out. Takes off in about 30 feet or less, immediately pull vertical & she will climb as long as I want.

My next plane will most likely be a 4*40 with either a Saito 72 or 82. I'll cut one rib bay off of the wings for total span. I'm thinking of making the tips look like a Smoothie that I saw recently. I would like to overpower it too just for grins.

i am not really lookin to hang this thing forever but what i do want is when i point it up i want it to go up till i decide i dont want it to go up any more

i guess i spoiled myself with my sig wonder. i have an o.s. 40fp on it and itll climb clear outa site if you let it

sounds like a 90 sized four stroke is a good choice. now tell me what brand is the better choice . price is a consideration . i am not a cheepskate but dont have piles of money either .


i was thinkin a saito golden knight would be a good choice...... anyone know anything about them?

[b]A lot of people around here know a lot about the Saito line of engines. Most of them throw rocks at other brands.

What you need to know for your question though, is that the Saito FA-90, whether the GK version or not, is both lighter and more powerful than the similar sized OS four stroke.

Bill.

The Saito 91 is a good engine for this plane. If you have to have more power get a Saito 100 or how about the 220

Hello; My four star 60 has an old OS 90 four stroke pulling it around. The engine has about as much power as a Saito 80 but it'll swing a huge prop, which I like. The other 4 star 60 that I have seen had a surp' 91 on it, the more power was obvious, he could actually hover it without much effort. I brole the tail off it and haven't got around to fixing it yet. I should take a break from covering the Gee whiz Bee, and make up a new tail. I fly at sea level, and know that higher altitude needs more power, but I like the way it flies with the good old 90.

Try the GMS .76 Perfect match for the 4* 60.

Thought the Four Star was originally designed for a four stroke.

A Saito 100 with an APC 15x6 is a perfect match for spirited sport flying. Very unlimited- it would give you all the vert that you could want. I flew this combo for a while.

If you have a little more money to burn a YS 110 would drop right in. It would be an insane amount of power (the YS 110 is more in the Saito 150 class) but it would be lots of fun. The 110 would make the plane accelerate faster on a vertical than the Saito 100 would fly it level.

Both of these engines are more than is really needed to fly the plane, but if you are going to buy a new 4-stroke engine for it then you might as well do it right!

Walt

yes i was thinking 100 or 110 myself....... are these big four strokes tempermental or are they easy to tune?

i have an o.s. .52 fs surpass on my wifes lt 40 . it took a little tinkering to get it just right but i have not touched the mixture needle in months and we fly a couple times a week.

would a used engine be okay or do youall suggest i get a brand new one?

Cant, I have a Saito 100 and a YS .91, the YS is 7 oz heavier, the Saito 100 was the easiest Saito to break in of all my Saitos, the YS .91 has been exemplary, neither has had any issues.

I have 2 4* 60s, One with an FS91 and one with an RCV 91CD.
Since these planes build tail heavy the 91CD balanced it perfectly. Had to put a heavy hub on the FS91.
From a performance standpoint the FS91 has a slight edge on the 91CD but the 91CD is much smoother and has much better fuel economy.

Cantw8t,

Buying a used engine is like buying a used car. You can either end up saving lots of $$ and get a great deal, or end up having to deal with someone else's problems.

New and used Saito 100's are very easy to find. YS hasn't made the 91 for a few years so buying used is the only way to go. (By the way the YS 91 is a good bit stronger than the Saito 100). YS 110's sell out of stock even before they reach the US docks so it takes a little perseverence to buy a new one and there are very few used 110's on the market.

I bought a YS 91AC used earlier this year for something like $150 and it was a super deal. The engine looks and runs like brand-new. But you can never tell.

To be honest I'd recommend a Saito for your 4*, either the 90 or the 100, especially since you are new to this. Lots of folks know how to set up a Saito right but you are less likely to find good help at the field to help with a YS. And as much as I like YS engines, a YS would really be major over-kill for the plane.

Walt