Welcome to Club SAITO !
04-03-2020, 04:14 AM
I read somewhere where Dave got 9150 peak on his 82 with an apc 14x6. That's very close to what I get on my unmodded one.
Last edited by Glowgeek; 04-03-2020 at 04:18 AM.
04-03-2020, 04:28 AM
Crunchy, either you had an exceptional 82 or a less than optimal 91. My 82 struggles to peak an apc 14x6 sport at 9500 where my 91 peaks the same prop over 10100 easily. No comparison between those two imo.
My 72 peaks an apc 13x6 sport at 10100, a very strong runner as well.
Nope, my two 82's are pigs, that's my story and I'm sticking to it.......
My 72 peaks an apc 13x6 sport at 10100, a very strong runner as well.
Nope, my two 82's are pigs, that's my story and I'm sticking to it.......
what I do find amazing is the difference in numbers and thought’s on how to prop the Saito’s. Sometimes it’s don’t prop over 9500 but then complain that it won’t turn 10500. So someone needs to say what is actually good and bad. But I know we all have different ideas on what is right and wrong. That’s what makes this all interesting
04-03-2020, 04:49 AM
Well to be frank, it either makes rated hp or it doesn't. On the bench I use a wide variety of apc props to test an engine's ability to produce good torque and hp. I can make any saito turn 11000 if I want to but that's not my goal. The prop swapping exercise is to determine where the engine makes torque and hp, then determine which portion of those curves are best fitted to a particular airframe. I also get an excellent idea of the health of the engine in the process. I rarely have to swap a prop on a plane using that technique.
Neither of my 82's have made the rated 1.5 hp with any prop. All of my other saitos have made better than rated hp. It is what it is.
Saitos tested to date. 45(3), 50, 56(2), 62(2), 65, 72, 82(2), 91, 100, 115, fg21.
Neither of my 82's have made the rated 1.5 hp with any prop. All of my other saitos have made better than rated hp. It is what it is.
Saitos tested to date. 45(3), 50, 56(2), 62(2), 65, 72, 82(2), 91, 100, 115, fg21.
Last edited by Glowgeek; 04-03-2020 at 05:18 AM.
04-03-2020, 05:56 AM
Yes, yes it was.
I have two criteria for the engine,
1) does it fly the plane
2) does it fly the plane well
Meet 1 & 2, good enough for me.
At first the OS 52 flew my LT-40 well, then it started acting up, so now it has an FG-11 that flies the plane well for a long time. Thats a ++ in my book.
I have two criteria for the engine,
1) does it fly the plane
2) does it fly the plane well
Meet 1 & 2, good enough for me.
At first the OS 52 flew my LT-40 well, then it started acting up, so now it has an FG-11 that flies the plane well for a long time. Thats a ++ in my book.
04-03-2020, 06:40 AM
Well
i wish I was one to keep better records of the engine’s on run.
I do know that my engine’s always run better then anyone else’s . And like ACDII says if it fly’s the plane like I like then all is good.
i wish I was one to keep better records of the engine’s on run.
I do know that my engine’s always run better then anyone else’s . And like ACDII says if it fly’s the plane like I like then all is good.
04-03-2020, 04:49 PM
Hey Dave,
Not sure when your birthday is, or if you still have them at your age
But...... you will be getting a birthday present sometime next week! A lot of Saito stuff including your salt shaker muffler.,a pair of 100 twin (90 too) new flex pipes etc.
Tossing in some magazines a real pretty old model mag from 1961, some machinist magazines for ideas and one surprise mag.
Enjoy
But...... you will be getting a birthday present sometime next week! A lot of Saito stuff including your salt shaker muffler.,a pair of 100 twin (90 too) new flex pipes etc.
Tossing in some magazines a real pretty old model mag from 1961, some machinist magazines for ideas and one surprise mag.
Enjoy
04-03-2020, 06:33 PM
My Feedback: (1)
Yep, excessive prop loading will definitely cause an overly rich mid range condition. Not just just because of more fuel requirement at peak but moreso the requirement at idle. At least that's what I've found.
BTW, a 14x6 is not too much prop for an 82, at least it shouldn't be.
BTW, a 14x6 is not too much prop for an 82, at least it shouldn't be.
you guys know the Saitos better than I do, I am still thinking the 2st way
Jim
04-04-2020, 03:17 AM
My Feedback: (102)
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes
on
25 Posts
Great timing Gary, my birthday is on the 26th and I'll be 78, holy moly, 5 minutes ago I was 25. It looks like some fun stuff, is that one muffler a SlimLine? Thankyou much. My brother John's birthday is today, he flies real planes, Cessna 182's mostly.
Like ac and crunch, if it flies the plane that's the supreme test, I lean toward the larger end of the prop range and the smaller end of the plane's engine range.
Today I'm going to do some "stuff" that keeps me in my 50's, like split a bunch of wood, run a couple of trees through the wood chipper and till the garden again. No play today. Saitos and Briggs and Stratton's except for two Kohlers.
The new truck engine limbered up at 500 miles, hills that it down shifted on two weeks ago it climbed yesterday and stayed in 6th gear and 1,500 rpm at 60 mph.
Like ac and crunch, if it flies the plane that's the supreme test, I lean toward the larger end of the prop range and the smaller end of the plane's engine range.
Today I'm going to do some "stuff" that keeps me in my 50's, like split a bunch of wood, run a couple of trees through the wood chipper and till the garden again. No play today. Saitos and Briggs and Stratton's except for two Kohlers.
The new truck engine limbered up at 500 miles, hills that it down shifted on two weeks ago it climbed yesterday and stayed in 6th gear and 1,500 rpm at 60 mph.
Last edited by Hobbsy; 04-04-2020 at 03:32 AM. Reason: Add a couple of thoughts.
04-04-2020, 08:00 AM
Hmm, last night I ordered some Tamiya paint from HobbyTown, since they are all closed around here, any place I can get model paint is closed, and when I got the order confirmation it came from aMainhobbies. What is odd is that I had gone to that site earlier to order paint, and they were showing out of stock on most of it. What a weird world. What sucks is shipping was nearly half the total cost of the paints. Amazon has me spoiled.
04-04-2020, 11:15 AM
My Feedback: (1)
NEGATIVE
my doctor called me today, the tests for both my wife and I are negative for corona.
actually I was kind of hoping it was corona, because A) it was not so bad.. B) because if we did have it we would most likely not get it again this year.. so now we can get it and it may be worse than what she had. the Dr said what my wife just may have had Bronchitis combined with a Sinus cold,, ???? she said that a cold is how Bronchitis is brought on.
I hope my Saito friends stay clear of corona !!!
Jim
my doctor called me today, the tests for both my wife and I are negative for corona.
actually I was kind of hoping it was corona, because A) it was not so bad.. B) because if we did have it we would most likely not get it again this year.. so now we can get it and it may be worse than what she had. the Dr said what my wife just may have had Bronchitis combined with a Sinus cold,, ???? she said that a cold is how Bronchitis is brought on.
I hope my Saito friends stay clear of corona !!!
Jim
04-04-2020, 11:27 AM
My Feedback: (1)
Hmm, last night I ordered some Tamiya paint from HobbyTown, since they are all closed around here, any place I can get model paint is closed, and when I got the order confirmation it came from aMainhobbies. What is odd is that I had gone to that site earlier to order paint, and they were showing out of stock on most of it. What a weird world. What sucks is shipping was nearly half the total cost of the paints. Amazon has me spoiled.
Jim
https://www.hobbytown.com/rc-airplanes/c3
https://www.amainhobbies.com/?gclid=...xoC3cAQAvD_BwE
Last edited by the Wasp; 04-04-2020 at 11:31 AM.
04-04-2020, 11:37 AM
My Feedback: (1)
what engine ?? guys, tell me !
what V6 car engine has 4 over head Cams, and has only 1 "one" Exhaust Manifold Port pre Head ??
I know, do you ?
EDIT, no cheating LOL don't be looking it up on the Net LOL
Jim
what V6 car engine has 4 over head Cams, and has only 1 "one" Exhaust Manifold Port pre Head ??
I know, do you ?
EDIT, no cheating LOL don't be looking it up on the Net LOL
Jim
Last edited by the Wasp; 04-04-2020 at 11:47 AM.
04-04-2020, 12:58 PM
Just a follow up on a much earlier comment:Regarding flow velocity in small intake runners. At a given speed, in a given engine, the air velocity in the smaller runner will actually be higher.
The carb however is a different issue yet the same principle
The carb however is a different issue yet the same principle
Last edited by Jesse Open; 04-04-2020 at 07:06 PM.
04-05-2020, 04:16 AM
Yep, you can't defy physics. In this case the Bernoulli effect.
Design for cylinder charging and expelling effeciencies is so complicated that computer programs are used to design today's engines. The smallest change to one of the dozens of variables can have a dramatic effect on desired performance. Won't keep me from trying though.
Even though the Saito engineers have developed a line a very strong engines they had to make some compromises to keep costs down. Namely the machining, or lack thereof, in the inlet and outlet ports. I believe that with a little careful smoothing of the short turn radii significant effeciency gains can be realized. My fa82 pig is a good candidate for such an endeaver.
For all you naysayers out there, yes I could simply move up to the next size engine but where's the fun in that? It's obvious to me at least that the fa82 has issues, it's just a matter of finding and solving them. The higher flow exhaust helped, the compression increase helped too. The larger carb didn't help and therefore I doubt seriously that a larger intake tube would either. All things point to flow effeciency problems. Dremel time!
Design for cylinder charging and expelling effeciencies is so complicated that computer programs are used to design today's engines. The smallest change to one of the dozens of variables can have a dramatic effect on desired performance. Won't keep me from trying though.
Even though the Saito engineers have developed a line a very strong engines they had to make some compromises to keep costs down. Namely the machining, or lack thereof, in the inlet and outlet ports. I believe that with a little careful smoothing of the short turn radii significant effeciency gains can be realized. My fa82 pig is a good candidate for such an endeaver.
For all you naysayers out there, yes I could simply move up to the next size engine but where's the fun in that? It's obvious to me at least that the fa82 has issues, it's just a matter of finding and solving them. The higher flow exhaust helped, the compression increase helped too. The larger carb didn't help and therefore I doubt seriously that a larger intake tube would either. All things point to flow effeciency problems. Dremel time!
Last edited by Glowgeek; 04-05-2020 at 04:49 AM.