Hobbsy

My Feedback: (102)

http://www.modelflight.com.au/graupn...lers_nylon.htm

You might find some to your liking some here.

Thunderchild

Yeah, I've used the nylon three blade gray Graupners here in West Oz. Most shops will carry them or get them in for you.

Pretty easy to come by. Just remember to boil them before you use them.

TC

dubs1946

Hi could someone give me some rev figures for a Saito 120 at the moment i am getting 9300 on the ground with an APC 15x6 and 15% nitro. on the ground.
The aircraft/engine seems reluctant to rev out in a dive and sounds like its running on 3/4 throttle, someone suggested putting in an air scoop on the cowle to get more air into the back of the cowl as it may be starving for Oxygen, i have done that as it makes sense but have not flown it yet to test it.
As well as the 15x6 could someone give me other prop sizes and revs that they get, a ball park number would do as props and conditions are all different, just so i have a base to work to.
The aircraft weighs 14 pound and is a Hurricane.
Thanks. Dave.

w8ye

My Feedback: (16)

The Saito 120 was made for many years and there are many variations

Is yours a straight 120 or a 120S? The last 15 yrs they made the 120S

The performance you describe would be correct for a old style 120

mike109

G'day Saito people.

On Sunday I flew my No1 Saito 56 for the first time in a couple of months. It is now about 7 years old and has probably done several hours flying as it is in the trainer I use for teaching new comers. It has always been a consistent performer. I had oiled it and was having difficulty getting the electric starter to turn it over so I resorted to the finger treatment. As a result, it started first flick. Backwards. It ran for about 15 seconds before we could stop it. Next flick it was running normally and flew as it always does.

Half an hour later I tried to start it again. As Bluebottle would say " No sausages." It simply would not fire. The plug checked out OK, there was fuel at the carby but it was simply not getting fuel to where it was needed.

I packed up and went home and did some thinking on the way. What would stop it running or even firing with a good plug and fuel at the carby. Answer - No fuel getting to the cylinder. Why? And then I remembered. These engines have an O ring at the head where the inlet from the carby enters the head. Perhaps it had been dislodged by the reverse running? And sure enough. When I looked at the engine, the O ring was not where it should have been but pushed out slightly.

This particular engine has had a bit of a history. It has had at least two bad crashes both of which broke the carby mount off the backplate and, I suspect, slightly bent the fuel inlet tube. I also noticed that the 56 does not have a step in the tube which would push the washer and O ring into the head. Some other models seem to have this and some don't. I think it may be time for a new inlet tube and O ring. And time to run in the new 72 in my backup trainer.

AE4NR

Recently I switched over to 4 cycle from 2 cycle my collection of Saitos are now 2 Saito 100's one is on my Aeroworks Edge 540t 40-61 the other is on my easy stik 60 I also have a Saito 56 which is mounted on a Great Planes Gee Bee profile. I also own a Saito 82 which is presently looking for a plane to sit on so far all have given me fairly decent performance other than a problem with the 100 on the Edge leans itself out during flight a problem I am sure I can get around.

RPMcK

My Feedback: (1)

What's the story on boiling the props? That's one I've never heard of before.

Ron

w8ye

My Feedback: (16)

back 50 yrs ago we boiled the props before we used them or they would break

Ernie Misner

Hi Hobbsy! That's a good head's up about the 2 needles interacting and affecting one another. I didn't realize they were that sensitve to that though. Thanks,

Ernie

Slats!

My Feedback: (1)

Hi are most using the osf plug or the han3011. Is there any difference. Thanks

w8ye

My Feedback: (16)

I think the OS "F" is just a little better but I'll use either one depending on what's available

Matagordababy

I've a New/Old FA-270T (Twin) that I need Flexible Exhaust Stacks for. I've also seen drawings of a Pitts Style Muffler Assembly with and without Smoke Fittings. Anyone know where I can get my hands on any or all?

I'm also looking for a good Owners Manual. The one provided is pretty loosey-goosey.

Matagordababy
[email protected]

GaGeeBees

My Feedback: (23)

Keleo Creations is a good option for a good exhaust header for your 2.70. Kelvin is a true craftsman and a great guy to deal with. http://www.keleo-creations.com

Horizon still has the flex pipes if you want to go that route. http://www.horizonhobby.com/Products...D=SAI182TD1112

PDF of the manual is attached.

Matagordababy

You Sir, are a Gentleman!

Matagordababy

dubs1946

hi w8ye My 120 is the 120s so have you any figures i could start with?
thanks.
Dave.

w8ye

My Feedback: (16)

These numbers are from the tachometer readings forum

Saito 120 w/ APC 16x4W on 20/20 fuel = 10000 rpm
============================================
Saito 120 should get 9300 on APC 16x6,
============================================
At sea level, 65 degrees F, fuel 15% nitro 18% oil, black plastic Master Airscrew 15x10, turns 8100 rpm static on the ground
MASTER AIRSCREW 15x8 = 8500 RPM

Hobbsy

My Feedback: (102)

Ron, I've been flying the Graupners almost exclusively since 1991 and have never boiled one.

stallwart

Here's my recently finished GP 1/12 P-47 powered with a Saito 30. It flies well with a MA 10x6, but I'm considering a 4-blade prop.

Can anyone suggest an ideal 4-blade for this application?

VeeAte

I usually use this chart to find out what 3 or 4 blade prop to use.
http://www.zingerpropeller.com/_2_blade_.htm

But it looks like Zinger at least don't make 4 bladers for that size.

Will give you a rough idea of what size you need however.

Ernie Misner

Hobbsy, I don't see Graupners around here in the NW. Where are you getting them?

Thanks,

Ernie

Hobbsy

My Feedback: (102)

Hey Erinie, how are things in the great NorthWest? I order the Graupners from Hobby-Lobby.

www.hobby-lobby.com

Without the hyphen it goes to some other hobbylobby.

thiagopivoto

Hello Guys,


I would like to know if can I use this tachometer to measure rpm's in my Saito break in?

It is a contact tachometer.

Thanks,


Thiago

w8ye

My Feedback: (16)

If you can accurately hold it in the center of the crankshaft as it rotates.

This is a dangerous procedure

thiagopivoto

W8YE,

Take a look in this picture. The crankshaft have a small hole to put a contact tachometer.

GaGeeBees

My Feedback: (23)

I say go for it, but please have a buddy there shooting video (he can also drive you to the emergency room)