Welcome to Club SAITO !
07-27-2009, 10:41 AM
Senior Member
RE: Welcome to Club SAITO !
Had a chance to put 3 tanks through the .72 yesterday (Sig Mayhem 40) Flew nice on the 14x4W (discovered the "W" stands for "Wonce" - had a prop strike on the first landing and trimmed it down to a 13x4W 
), flew the remaining flights on the 13x6 APC
Does 6-7 minutes flight time at part throttle seem right to you folks for a 8.8 oz tank?
), flew the remaining flights on the 13x6 APCDoes 6-7 minutes flight time at part throttle seem right to you folks for a 8.8 oz tank?
07-27-2009, 10:57 AM
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RE: Welcome to Club SAITO !
ORIGINAL: OldFart1
Does 6-7 minutes flight time at part throttle seem right to you folks for a 8.8 oz tank?
Does 6-7 minutes flight time at part throttle seem right to you folks for a 8.8 oz tank?
07-27-2009, 11:04 AM
Senior Member
RE: Welcome to Club SAITO !
I must be running way too rich then - because I'm not getting much more than half that at half throttle. The motor is freshly rebuilt, so may still be a bit tight.
07-27-2009, 11:08 AM
RE: Welcome to Club SAITO !
This has always been true for me
Rule of thumb is approximately 1 minute per cubic inch per ounce at wide open throttle. 8.8/.72 = 12.22 minutes
Rule of thumb is approximately 1 minute per cubic inch per ounce at wide open throttle. 8.8/.72 = 12.22 minutes
07-27-2009, 11:24 AM
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RE: Welcome to Club SAITO !
I've seen that rule of thumb many times - problem is none of my planes seem to have ever seen it
I can guarantee that if you apply that rule to my YS 120 F6F Hellcat (14 oz tank), 8 minutes into your calculated 12.73 minute flight you WILL be flying a glider....
I can guarantee that if you apply that rule to my YS 120 F6F Hellcat (14 oz tank), 8 minutes into your calculated 12.73 minute flight you WILL be flying a glider....
07-27-2009, 11:35 AM
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RE: Welcome to Club SAITO !
ORIGINAL: w8ye
You have to run a wire out there with a dog leg offset in it to reach the throttle arm.
Like was done on this plane that originally had a 46FX engine
The only thing about a FG-20 is you cannot run a wire all the way or you will get RF interference.
You have to transition from plastic to wire at a bellcrank alongside the engine mount
You have to run a wire out there with a dog leg offset in it to reach the throttle arm.
Like was done on this plane that originally had a 46FX engine
The only thing about a FG-20 is you cannot run a wire all the way or you will get RF interference.
You have to transition from plastic to wire at a bellcrank alongside the engine mount
Does the throttle bind up with that setup?
07-27-2009, 04:41 PM
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RE: Welcome to Club SAITO !
ORIGINAL: OldFart1
I've seen that rule of thumb many times - problem is none of my planes seem to have ever seen it
I can guarantee that if you apply that rule to my YS 120 F6F Hellcat (14 oz tank), 8 minutes into your calculated 12.73 minute flight you WILL be flying a glider....
I've seen that rule of thumb many times - problem is none of my planes seem to have ever seen it
I can guarantee that if you apply that rule to my YS 120 F6F Hellcat (14 oz tank), 8 minutes into your calculated 12.73 minute flight you WILL be flying a glider....
07-27-2009, 04:50 PM
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RE: Welcome to Club SAITO !
I'll play with the tuning a bit more this week and try again Sunday and see what I can squeeze out of her. I'd be happy with 10-12 minutes at part throttle, as the plane flies very nice about 1/2 throttle with the 14x4W
07-27-2009, 08:08 PM
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RE: Welcome to Club SAITO !
On a hot 93 degree day with about two and a half hours total running time on my Saito .82GK whilst doing very enthusiastic flying of my Aeroworks Extra 260 I burned up the motor!
It quit on me, naturally it was when I was at the downwind end of the runway low speed low altitude. The result was ugly. No doubt I had it running too lean.
Well it's all repaired now, the airframe that is, the motor is toast. I've installed a new .82 and I need to know if I was too lean on the high speed needle or the low speed needle. It had a very smooth 2200 rpm idle and didn't balk when throttled up quickly. I didn't think you could run too lean on the lowspeed setting so apparently I was too lean on the high speed.
When the manual talks about not running the engine too lean they are talking about the high speed needle correct?
It quit on me, naturally it was when I was at the downwind end of the runway low speed low altitude. The result was ugly. No doubt I had it running too lean.
Well it's all repaired now, the airframe that is, the motor is toast. I've installed a new .82 and I need to know if I was too lean on the high speed needle or the low speed needle. It had a very smooth 2200 rpm idle and didn't balk when throttled up quickly. I didn't think you could run too lean on the lowspeed setting so apparently I was too lean on the high speed.
When the manual talks about not running the engine too lean they are talking about the high speed needle correct?
07-27-2009, 08:28 PM
RE: Welcome to Club SAITO !
Hi, I am curious. When you say the engine is toast, is the piston siezed, or the cylinder bore scored? Is it not possible to rebuild the engine in such an event, or does it cost more than a new engine to do so?
If you are trashing the engine, i would be interested in "playing" with it. Please contact me by email.
Thanks.
If you are trashing the engine, i would be interested in "playing" with it. Please contact me by email.
Thanks.
07-27-2009, 09:09 PM
RE: Welcome to Club SAITO !
ORIGINAL: leedees
On a hot 93 degree day with about two and a half hours total running time on my Saito .82GK whilst doing very enthusiastic flying of my Aeroworks Extra 260 I burned up the motor!
It quit on me, naturally it was when I was at the downwind end of the runway low speed low altitude. The result was ugly. No doubt I had it running too lean.
Well it's all repaired now, the airframe that is, the motor is toast. I've installed a new .82 and I need to know if I was too lean on the high speed needle or the low speed needle. It had a very smooth 2200 rpm idle and didn't balk when throttled up quickly. I didn't think you could run too lean on the lowspeed setting so apparently I was too lean on the high speed.
When the manual talks about not running the engine too lean they are talking about the high speed needle correct?
On a hot 93 degree day with about two and a half hours total running time on my Saito .82GK whilst doing very enthusiastic flying of my Aeroworks Extra 260 I burned up the motor!
It quit on me, naturally it was when I was at the downwind end of the runway low speed low altitude. The result was ugly. No doubt I had it running too lean.
Well it's all repaired now, the airframe that is, the motor is toast. I've installed a new .82 and I need to know if I was too lean on the high speed needle or the low speed needle. It had a very smooth 2200 rpm idle and didn't balk when throttled up quickly. I didn't think you could run too lean on the lowspeed setting so apparently I was too lean on the high speed.
When the manual talks about not running the engine too lean they are talking about the high speed needle correct?
If you get them too lean they backfire and quit
07-28-2009, 01:46 AM
RE: Welcome to Club SAITO !
You are not correct
The way the carburator is made the low speed if set too lean will restrict the fuel flow at high speed resulting in your engine going lean on top end even if your HSN is out 8 turns
The way the carburator is made the low speed if set too lean will restrict the fuel flow at high speed resulting in your engine going lean on top end even if your HSN is out 8 turns
07-28-2009, 07:23 AM
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RE: Welcome to Club SAITO !
In this pic you can see an elongated "cats eye" slot, the LS needle is actually a sleeve that moves in and out over the slot varying how much of it is exposed to the intake airflow. If you set the LS needle with the HS set too rich you'll get the LS too lean trying to compensate for the over rich HS needle, That's why I set the LS needle with the HS needle at absolte peak.
07-28-2009, 10:08 AM
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RE: Welcome to Club SAITO !
If anybody is having problems with the Saito FG-20 like I did there is a really cheap solution. Just go to this web site and buy the VRE spark plug. http://sparkplugs.morrisonandmarvin.com/ All of the problems with running and black soot coming out of the engine disapeared and now I am a happy Saito owner again. I only fly four stroke and like a lot of you guys I have a lot of them. I also fly a lot of multi engine aircraft and have found Saito to extreemly reliable.
Oh well, back to work.
Les
Oh well, back to work.
Les
07-28-2009, 10:48 AM
RE: Welcome to Club SAITO !
that is amusing after running low throttle for a short time on the FG-20 and then give it full throttle. There's then a big bunch of black soot that blows out the muffler until the engine gets up to speed. It doesn't seem to stick to the plane.
Morris and Marvin sell the Rimfire Plugs which are the best of the 1/4-32 spark plugs but they are not exactly made the same as the Saito plug and look like the cap will not work but in any case, people are using it with success.
Morris and Marvin sell the Rimfire Plugs which are the best of the 1/4-32 spark plugs but they are not exactly made the same as the Saito plug and look like the cap will not work but in any case, people are using it with success.
07-28-2009, 01:06 PM
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RE: Welcome to Club SAITO !
I was wondering if there was anyone who has tried the Master Airscrew 3 blade 13X8 on a Saito .82? I would like to try a pair on a TF B-25, but I was hoping for some input before I buy a pair.
Thanks,
Dave
Thanks,
Dave
07-28-2009, 03:03 PM
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RE: Welcome to Club SAITO !
I'm running 2 OS .70's on a wing mfg. B-25 with 10-7, or 11-5,-11-6, 3 blades & get around 8900-9400 rpms out of them. 13-8 is a lot for a .82 to turn. As long as its not lugging the engine down too much, it might work for you. I think an 13-5/6, 12-6/8 would be much better. Bill