Which one has more power?

[wwwarbird]

 I realize that there is probably a minimal difference, but I'm wondering which engine produces more power, the Saito .30 4 stroke, or the O.S. .30 Surpass 4 stroke? Does anyone have any experience and/or feedback on these two engines?

[wwwarbird]

Does anyone have any input or suggestions on this one?

[Bob Reeves]

Have flown the Saito 30 and 40 but not the OS so can't help.  Might try to get in touch with Bob Z, he has a 4 stroke email group and someone might have done a direct compairson..

RZambelli@moog.com

[wwwarbird]

Thanks Bob. Were you happy with the Saitos in general though? What props did you end up settling with on them? I've only really spent time around the Saito .56 on Keith Sandberg's Legacy, and it seems like a great engine, very consistent with lots of power and torque.

[Bob Reeves]

The Twistmaster (modified Twister) with a Saito 30 placed in P-40 at Brodaks a couple years ago, wanted a little more power for these Oklahoma winds so replaced the 30 with a 40a. Have been very pleased with both engines, can't remember what I was running on the 30 but am running a Rev-Up 11-4 on the 40 with 20% nitro.

Many have reported using a higher pitch Zinger Pro with good results, I stuck the Rev-Up on it and it works well enough that I haven't taken the time to try other props. I would say you can't go wrong with either one depending on what you put it on.

[wwwarbird]

Thanks Bob, +K to ya!

[Bob Reeves]

Your entirly welcome, hope to have helped at least a little..

Did forget to mention, if you go with the Saito and you can swing it.. get the UHP venturi. Some will tell you to just wire the throttle open and ya that will work but the UHP/Pat Johnson setup eliminates all posibilities of the carb causing you problems.

Oh ya... Use a plastic clunk tank, don't even waist your time trying any form of metal tank.

[proparc]

Your entirly welcome, hope to have helped at least a little..

Did forget to mention, if you go with the Saito and you can swing it.. get the UHP venturi. Some will tell you to just wire the throttle open and ya that will work but the UHP/Pat Johnson setup eliminates all posibilities of the carb causing you problems.

Myself and Bob Zambelli have been some of the people who have done well with the carb.  I have never told people not to buy the UHP. What I have been saying and continue to say is that if you want one fine, but YOU DON'T HAVE TO HAVE IT. 

My concern was that people were spreading the word that you HAD TO HAVE the UHP manifold to make the Saito's run right. It's crap. The Saito was designed specifically with that carb and literally thousands of RC''er's have done fine with it. 

A number of control line cats could not make the engine run consistly with the carb. For the life of me I don't know why, but if that is the case rock and roll. 

It is interesting to note that stunt cats will almost always routinely remove the carb of any RC motor.  My guess is that they don't know how to set the low and high speed needle valves on a RC carb and get intimidated.  In some cases the venturi size will be too big for stunt use and they have to make one. 

That said, the UHP manifold works, but, the the Saito carb,(and they happen to make a very good RC carb) works very well indeed if you know what you are doing.

[bob branch]

I have had experience with the OS .30 surpass and the news is not good. I used it in a Katana Mini similar to the one Frank Williams worked up with a .25 2 cycle. It was a nice plane with his .25. With the OS .30 Surpass it barely would stay in the air. It would not attain any line tension flown on the same lines he used. The motor just is not usable. I converted the Katana mini back to RC and fly it with the Surpass .30 and its a fine sport plane. Definately limited verticle with the motor, and certainly will not do 3D aerobatics, but it is a nice sport flier. I'd stay away from it.

bob branch

[Ron Merrill]

Mr. Bob Reeves, do you use pressure when running your Saito .40 with the plastic tank or uniflow? Here in Texas  some swear by pressure. Thanks Ron.

[Bob Reeves]

Mr. Bob Reeves, do you use pressure when running your Saito .40 with the plastic tank or uniflow? Here in Texas  some swear by pressure. Thanks Ron.

Yes, clunk tank plumbed per the instructions (conventional plumbing) that come with the tank and muffler preasure to the vent tube. I am now running 3 profiles with clunk tanks set up  this way (Brodak 25, Saito 40 and FP 20) all 3 give consistant runs from the second the engine starts till it quits.

[Bob Reeves]

Fully understand your position, I flew RC for several years during the 80's and know how to adjust an RC carb. My view is why take the chance with an unnecessary complicated carb that may give you a problem when an off-the-shelf simple bullet proof option is available. If one can afford the added expense why not, one less thing you need to diddle with.

[wwwarbird]

Yep, I pretty much use clunk tanks as much as possible, it just works.

[Ron Merrill]

Mr. Bob Reeves, Thanks a lot for the tank info, was going to use metal but will use 4oz. clunk tanks with pressure. They (it's a twin) already have the UHP NVA's. Thanks again, it's so nice when you can ask and get a solid answer. Ron.