My Joss stik should be here friday, and while I was thinking about the os 91 fx, I am convinced (you guys convinced me) that the magnum is just as good and cheaper. I called magnum about Hp figures, they said all those numbers are bogus....and they did not have them to supply (weird, or confident) , anyways, what size gas motor wood pull the Joss around w/o pulling the fire wall off or making it weigh 25 lbs...is it too small of an airframe for gas.....I do not gas engine sizes..thanks

fire, not all those HP numbers are bogus but they are fairly useless, turning a given prop at a certain rpm however is very useful. I have never owned an OS or a Magnum so I can't speak to that. My choice would be a YS .91FZ or a Saito 100. Both are very worth considering if you don't have the engine yet.

Some people refer to all types of fuel burning engines as gas engines. They are technically correct. But that doesn't clear up what you are looking for, or at least it doesn't to me.

I would never say that Magnum engines are as good as OS engines. I do say that sometimes they are "good enough" for our uses and that there may not be a benefit in spending more money for an OS engine when it is likely that the difference will not be perceived. Clear as mud?

A 1.40 (23cc) to 1.60 (26cc) gasoline/oil (petrol) engine such as the RCS/Moki 1.40 and the MVVS 1.60 gasoline/oil (petrol) engines would provide excellent power for the Joss Stick, if you are looking to escape the high price of glow fuel. I would not use a heavier engine than either of these engines.

A Magnum .61 - 1.20 two-stroke, or .91 - 1.20 four-stroke engine (all glow engines), would pull the Joss Stick with gusto and then some. I have heard from several people that the model even flies well with a .61 two-stroke.

A lot of what engines you may use depends on what you want the plane to do.

A 60 2 cycle glow engine will pull your Joss Stick around the field but it will be rather disappointing as far as waht it will do because of a lack of power.

Your original idea of a .91 2 cycle would be a much better choice.

There is a lot to be said for the newer design 4 cycle engines for this plane. The Saito 100 or Y-S 91 FZ would be modern - day light weight choices that will give you the advantages of 4 stroke power.

The only other Joss Stick I was around had a OS 120 4 cycle on it and there was nothing wrong with that combo.

A Zenoa 26 gasoline would work nice on one too. But keep in mind that you would probably want to mount the servos in the tail to offset the weight of the engine.

The stock Homelight 25 would fly it about like the 60 glow engine. But a Homelight with the G-23 or 26 carb on it might be interesting.

The Ryobi gasoline engine is rather long and unless you shortened the nose by 3", you would have a hard time balancing it.

If I were you, I would pretty much ignore any horsepower figures that an engine maker quotes. For as you may have already noticed, they are based on unrealistic rpms. I decided that some 45 years ago and I havn't changed my mind. I don't understand why they even bother? More realistic would be a certain prop at a certain rpm with a certain fuel, at a standard temperature and pressure. That would be more like it.

Enjoy,

Jim

I built a Jos Stick this Summer. It is the ARC version that they no longer make. I cut 1 1/2 inches of the nose and put a super tigre 2500 on it. Talk about short take off and great vertical. and this plane handles it like a big uh uh uh well a big stick.
load of fun but the the fuel bill is on gallon per day.


Just my $0.02 worth


Don//

I have had both the magnum 91 2 stroke and the os 91 fx 2 stroke and the os blows away the magnum!!!!!!!!!!!!!

The os is lighter, smaller and has nearly twice as much power and not to mention the os is way more reliable.

I had the magnum first and was very dissapointed with the power and dead stick landings.

WHen I tried the os it was unbelievable how much more power the os had than the magnum.

I have also had an os 46fx and a magnum 46, same thing here the os is twice the engine that the magnum is.

People who say magnum is just as good as os have obviously not tried or compared the two. There is a huge difference.


YOU GET WHAT YOU PAY FOR!!!!!!!!!!!!!!!!!!!!!!!!

Edge you are not comparing the same Magnums that we are talking about.

You are right and I agree with you about the old Magnum 91. It ran but just didn't make a whole lot of power. It had a 120 size crankcase and weighed a ton.

The new Magnum XLS series looks and runs like OS engines. At least how the OS engines should be running when some of them are not sucking air bubbles or peeling cylinders.

Enjoy,

Jim

I'm one who doesn't know what I'm talkin about... we tried and tried and tried to get a 91 FX to run but the darn @#$$# bubbles would not go away!!! soa friend lent us another .91FX to try on the GP Super Skybolt wihout success... bubbles AND overheating.. changed carbs, cleaned carbs, sealed remote needeles no good...
Bought a 91 MAgnum XLS ... as good as or better power than the FX's staight out of the box... idels reliably no deadsticks...
and two more EXpensive paper weights around the shop...
Regards,
Patrick

I didnt realize that magnum had a new 91 2 stroke. My mistake.
I sure hope the new one is better because the old one sure was a useless hunk of metal.

I have had 2 OS91fx engines that run perfectly and a friend has three of them in planes and they all run perfectly also. I guess there must have been some bad ones out there because there sure is a lot of people that complain about them. But we sure have had good luck with the os91fx engines.

It sounds like maybe magnum is producing a lot better engine now. It sure would be nice to pay a lot less for an engine with the quality of an os.

I have had very good luck with OS engines and not any luck with the MAgnum engines this is why I stand so firmly with the OS products. I have never seen a bad OS engine but I guess I havent seen them all. Just my 2 cents.

Hi Edge....yes Magnum has anewer XLS line that makes the difference... OS are still very reliable and near the top of the line, but quality issues have sprouted the 91 fx is one of those liner peeling and troublesome needle valves are common... the 120 II Surpass is another lemon in the line, and osme peeling in other.

Irvine (for the price) are the best I've seen these days in the OS price range

The El-Cheapo brands are starting to compete successfully case in point Magnum (after all most look and feel like oS clones.... remember Dell or Compaq?)

Will see how OS reacts to this... (hopefully with outstanding quality and lower prices ?
REgards,
Patrick