loughbd

The copyright date on the manual doesn't mean much. The intructions for a given engine were used for years. Just like the dates on a Colt firearm. It way say 1911 on the gun but it could have been made yesterday. Cox instructions were the same. I worked for hobby shack and we were the importer of saito engines until about 1990 and I know what we sold. I also lived in Japan from 1979 until 1984 and I know what the Saito engine box looked like in those years. I also own almost two dozen Saito engines from the first open rocker 30's and 40's and 80 twins to some of the current ones. They are all still in their boxes and I know when I bought them.

An oddball box doesn't make and engine rare. They could have thousands of them overseas. Funny how the the boxes sold in Japan are just like the ones sold here. What's in the boxes is probably exactly the same.

NM2K

My Feedback: (14)

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Just be sure to keep it on the ground where it belongs and not on the airplane. <G>

skypupmut

I have a pair of 45 s NIB the boxes are blue and white and not very big
no mufflers just the header with welded on pressure fitting
they are going in my B25 Marutaka kit almost ready to cover now
the info sheet is for the FA-40/45 special ABC

loughbd

Yup that's what Saito boxes looked like from the first ones til the middle 90's or so. The Saito 45S was sold in the US. I have one and parts from others.

loughbd

Radio Control Modeler Magazine, February 1995 Page 149. Indy R/C advertisement. Indy part number 24976 "Saito 45S $181.95". Yes they were sold in the United States and just about eveywhere else as late as 1995. That was 11 years ago. That was also the color of the box.

dmrcflyr2

My Feedback: (43)

Very interesting. I am just glad I got mine....

loughbd

So were thousands of others guys. They were and are great engines. I have several versions of the 45 including two with the bolt on heads.

Sturtz

My Feedback: (20)

FYI,, followed thru on the intake leak. It was not leaking or damaged. Temps got well over 90 deg that day, could be a factor for sure. Finally checked the backplate bolts and found them to be loose. Valve adjustments were fine as well. Could a loose backplate and or carb cause the intense heat so quickly ? After tightening the backplate I started it and it heated up quickly once again.
Before someone asks,, the hi-speed needle was plenty rich. Need to do some more looking for loose bolts etc but will report back.
Thank you .

Oh yeah,, could a fuel blockage cause these promlems as well ? Doesn't seem to have a fuel delivery problem but thought I'd ask while I was at it.

loughbd

The back plate being loose has no real effect. The crankcase is vented to the atmoshpere anyway. To prove that point in another thread here I took a saito 65 and removed 3 of the back plate screws backed the 4th out half way. The engine ran fine until the last screw came out and blew the carb and back plate off. The engine quit. All the back plate really does is keep the con rod on the crankpin and give the carb someplace to mount.

kaastrup

What 3-blade prop fits the Saito 72 best ?

I have tried a Graupner 12½x7 on a Graupner Sukhoi SU-31 (46 size), but there is way to much torx, and differense between left and right rolls...

loughbd

There isn't enough torque to affect the roll rate that much. It is more likely the way your ailerons are set up.

pedro_guim

Hi

Is there any problem with the Saito 82a?
Somebody told me that there is a problem of vibration... is this true?

If it is... What cause this? and how can I solve it?

Thanks
Best Regards

Hobbsy

My Feedback: (102)

There is no vibration problem with the .82, mine has been on a Sig 4 Star 60 and no issues at all.

IronCross

The back plate being loose could cause your problem... With a loose backplate the carb and intake can vibrate causing the o-ring at the head to leak... Depends on how loose loose is I have had to replace a couple of these o-rings... Visually the o-rings looked good but the engine was exhibiting symptoms like you described... Replaceing the O-rings cured the problem.. I followed Dr. Bill's advice and wired the intake pipe down and it has been problem free since...

William Robison

My Feedback: (3)

Kaastrup:

I like the MAS 12x6 three blade prop.

Sorry, torque reaction will always be there, it's part of using a propellor.

Bill.

William Robison

My Feedback: (3)

Brucfe:

Quote:

ORIGINAL: loughbd
There isn't enough torque to affect the roll rate that much.

Depends on the airpalne.

A trainer with a long span and a small prop wont have much at all. It will have about 5" of span per inch of prop, and not a lot of power anyway.

A high performance plane like his Corsair, grossly overpowered like most of our models, might be as low as 2:1 in the span to prop ratio. Torque will always be a factor.

Bill.

loughbd

Yes torque is there but not enough to make a big difference in the way an airplane flies. If it was that big an effect we couldn't fly C/L airplanes in the direction we do. They have VERY short wings and Very powerful engines. The torque should roll the airplane into the circle and it doesn't. Engine outthrust and right rudder won't stop the torque roll effect but we don't have the problem. The airplane flies flat and level.

loughbd

An R/C airplane with a 12 inch prop and a 24 inch span?? that's 2 to 1. I don't think so. That would be a 60 sized engine.

dougwill

IronCross
or anyone. What a great thread. You must add me to your membership. I am having a problem with my Saito 72. It was running hot and rough in my plane, so I pulled it out and put it on a test stand. With a different tank, centered on carb, new fuel, new plug, 14 X 4w (apc) prop, WildCat 15% fuel. It required 5 1/2 to 6 turns out on high speed needle to keep it running without over heating. Should I be looking for o-ring leak or something else?


Doug

William Robison

My Feedback: (3)

dougwill:

Your symptom really sounds like the classic intake leak. Replace the o-ring and aluminum washer at the top of the intake pipe, then put the safety wire tie around the cylinder to keep the intake pipe from moving.

And I've put you on the rolls as member number 268 in Club Saito.

Bill.

blw

My Feedback: (3)

Torque Wrench,

How does your 4*60 perform with the .82? I am building a 60 size pattern plane and have a .82 waiting for it, so I'm wondering about yours. I suspect that I'll have less profile drag than the 4* after looking at my 40 size kit waiting to be built.

see_e_oh

My Feedback: (4)

Question re CoolPower 30% Nitro Heli Fuel (22% all synthetic oil):

I run this fuel in my YS110. Is it OK to run in my SAITO FA-91S?

Thanks.

Steve

loughbd

The real question is why?? The YS would be happy on 20% nitro as in Powermaster YS20/20 and that saito would be happy on 15% nitro

dougwill

Bill
Thanks! What should be the max turns high speed needlle should come out before alerting you to a leak or blockage somewhere?
Also if your still up. My engine was in a 40 size Piper Cub with the tank almost an inch lower than carb center. Will engine draw fuel satisfactory from there or would a pump be advisable? Where can I get reference material on trouble shooting these great engines.



Doug

William Robison

My Feedback: (3)

Doug:

There is no set opening for the HS needle, but the FA-72 generally runs between 2½ and 3½ turns open on 15% fuel, and “Normal” props. More often toward the lower end than the higher, but a low tank will need a greater opening.

Saito carbs have good fuel draw, and while the tank center being an inch below the spray bar is more than usually considered acceptable, if your engine ran the tank out without going lean before you had the problem, stay with what you have. A pump or pressure system with a regulator could be used, but if not needed why bother? Alternately, if the engine was going lean when the tank level went down that could have contributed to the problem.

The only published book specific to the Saito engines, other than the owner’s manuals, was from RCM, and they seem to be gone. The magazine died several months ago, and I now hear their web site is gone too. That book was hopelessly out of date, but the techniques still apply.

On the other hand, you may have seen reference to my “Saito Notes” I’ve been giving away. If you’d like a copy send me your email address and you will have a copy too.

DO NOT POST YOUR EMAIL IN OPEN FORUM, send it either by PM or the email button below this post. Putting your email address in the open is an invitation to spammers that’s hard for them to resist.

Bill.