Saito Quesitons

Stuka Stunt Main Forum · 9 of 9 known posts recovered

Randy · Jun 29, 2001 12:24 AM

Well, I'm messing with a Saito 4 stroke engine a bit. I haven't even run it on a test stand yet. Just reading the manual. First question. I haven't been able to find a single prop nut to fit this thing so none of my spinners work. What size prop nut does this take? I tried a number of spinner nut adapters but none fit.

What kind of spinner are others using?

Has anyone followed the directions and ran a piece of tubing from the crankshaft to the muffler? What's the effect? I was talking to someone that just ran a vent tube from the crankshaft vent out of the plane (into the air) and used the muffler vent for pressure to the tank. What other creative venting is used?

What RPM do you run it at? Do you run it with the throttle full open? How about the idle adjustment? I was told by a couple of people to adjust the idle as per the manual with the throttle closed (figures) then to use the throttle to regulate lap times, but that seems like you aren't using the available power of the engine.

I'm sure I'll figure it out as I go along. Just thought I'd listen to some input here before I ran it. In case there's a "Oh man, just do do ..."

Randy

LNeumann · Jun 29, 2001 12:37 AM

#1 source

What size Saito do you have? I have some 1 3/4 and 2 inch 3-blade aluminum spinners that I got out of England that include adapter nuts for about 5 different sizes of shafts. I can sell these for $17.00 each with the adapters. I am not sure that the adapters will fit other spinner types, however.

On the throttle question, some, evidently, are using the throttle to regulate lap times. It is essentially the same on these as adjusting the venturi for various choke sizes. If you find you have to back it off too much, however, I think I would go to a larger prop of a lesser pitch.

These are very much a constant run engine. Don't expect them to do a 4-8-4 break (a little humor here to break up the evening hours).

Leonard Neumann

captcurt · Jun 29, 2001 04:16 PM

RE: 4-8-4#2 source

If we start talking about 4-8-4's, Old Sourdough will jump in thinking we've switched over to locomotives!

Tim McTigue · Jun 29, 2001 04:44 PM

RE: 4-8-4?#3 source

Wouldn't that really be an 8-4-8?

Tim

Steve Helmick · Jun 29, 2001 08:26 PM

RE: 4-8-4?#4 source

LAST EDITED ON Jun-29-01 AT 08:27 PM (EST)

Saito .40-.60's use a 6mm x 1mm thread, but the .65-.90's use 7mm x 1mm thread (per Du-Bro's catalog). Steve

Randy · Jul 02, 2001 12:42 AM

Saito#5 source

So, basically, I'm going to have to create my own adapter nut? Anyone know of an adapter nut that is 6MMx1MM on one end and 1/4-28 on the other (to match virually every spinner I have)?

Sounds like it's going to be fun. The darned shaft is so long anyway, I'm either going to have to cut some off of use a REALLY long spinner as it is.

Did my first test run today. Started right up and sure runs smooth. And it's so incredibly quite. At least I can fly at the local school without a bunch of static from the locals.

Randy

LNeumann · Jul 02, 2001 08:14 AM

RE: Saito#6 source

Dumb question, but what did Windy do? There are a number of people "playing around" with the Saitos so *somebody* ought to have an answer for you. I have got these adapter nuts for the spinners I have. There are five different sizes, so one of them has got to fit your Saito. I think they adapt to a metric on the other side, though.

Leonard Neumann

Ken Clapson · Jul 02, 2001 09:05 AM

RE: Saito#7 source

I believe Windy uses a Dubro type spinner onh his typhoon.

I have found, on the Satio 30's, a 2", on the 56 a 2-1/4" will work and on the 72 at 2-1/2" will work.

The reason for having to go with the lager diameter spinners is to allow the back plate nuts to clear the collar.

If building from scratch, you'll find the Saito needs a little more fuse wideth to enclose the throttle linkage. If not you'll have to cut the fuse quite a bit for the linkage, so the larger spinners, aren't really that much of a problem.

Ken

howard · Jul 02, 2001 09:27 AM

RE: Saito#8 source

Check out the four stroke forum over at Windy's site. There is a wealth of info on four stroke useage for stunt. Windy and Bob Z. have done a great deal of experimentation with four strokes. It's easier to learn from others than to strike out into unknown territory alone.

I don't make a habit of directing traffic from one forum to another, but if you're interested in four strokes, the forum at windyurtnowski.com is full of essential information.

Howard