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Old 01-20-2020, 06:44 AM
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If I can get my 125 to start and run reliably, I could get more flights on mine. Once I figured out what was causing it to snap over when applying up elevator, it was a joy to fly. Just haven't been able to get it started, and being inverted and buried in the cowl, makes it difficult to troubleshoot. I have a Kit version I am still working on, and if I run across a 115 when I have cash, then I will grab it for that plane. I have a YS110 that I planned to use, but the tank setup is too complex for that skinny fuse. I will find a different use for it in something with more room for the twin fuel dots it needs for fuelling.
Old 01-20-2020, 04:14 PM
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Default FA100 & FA115 Peak RPM W/ APC 14x8

Cold this afternoon but I ran both engines for you guys. Same fuel, prop, glow plug and test stand. Engines were warmed up for exactly 5 minutes before peak rpm was taken. HP and static thrust values are calculated. 15% nitro used and temp was 38įf.

FA100
9350 Peak
1.809 HP (Saito spec: 1.8 )
10.05 lbs. Static thrust

FA115
9810 Peak
2.090 HP (Saito spec: 2.1)
11.06 lbs. Static Thrust


Saitos, the little engines that can!
Old 01-20-2020, 04:19 PM
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Now if you just had a FA125 to throw in the mix...
Old 01-20-2020, 04:22 PM
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Send me one....
Old 01-20-2020, 04:30 PM
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Sorry, I don't own anything larger than a .91.
Old 01-20-2020, 05:11 PM
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Originally Posted by Captcrunch44
So for the math.
I am putting a Saito100 in a word modelís 46 size P51. (I know the thoughtís I happened to like world modelís). I was wondering for those who do math what would be the best speed prop. My thinking was a 12X12 APC. Please help me see the light
The place to begin in determining which prop to use for a go fast plane engine is to settle on how many rpm you want to see in flight. For instance, an FA100 will spin a 12x12 apc at very near to 10k on the ground and will probably unload in the air closer to 11k with a slick airframe like a WM 46 P51. Do you really want your FA100 to see that kind of rpm? Pick a max rpm number you want to see your 100 turn and I can recommend a prop.
Old 01-20-2020, 05:42 PM
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Acdii, mounting a YS110 or even a YS115 in a WM 46 size warbirds is commonplace in warbird pylon racing. I've researched warbird racing quite a bit but found that most people keep their tips and tricks for speed close to the vest.
Old 01-20-2020, 06:13 PM
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Originally Posted by Glowgeek
Saito fa100 is 20.9 oz and the fa115 is 23.49 oz. The fa125 is 24.69 oz. I've read in a number of places that the fa115 has the highest power to weight ratio of any of the saitos, that's one of the reasons I was looking for one.

My 60 size Topflite P51 flies good on the fa100 as well. No speed demon, but no shortage of pulling power either. It's just about right. I was going to mount the fa115 on it but I think I'll put the fa115 on the 46-55 size Strega instead. That why I bench tested it with the 12x12.5 prop. I have a 13x11 apc on order.
Pete,, did you read that^ ??

Lonnie, that will make Pete smile,, yee-up

Jim

Old 01-20-2020, 06:28 PM
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Cap, go to the Tachometer page and do some searching, maybe go back and start with the fist page.

here are some FA 100 RPM numbers with Zingers,, now I would believe that APC of the same size would rev higher.

Saito FA-100

oops, more info>
Saito FA-100GK

save the link, there's a lot more engines there

Jim

Last edited by the Wasp; 01-20-2020 at 06:36 PM.
Old 01-20-2020, 06:47 PM
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Thanks
it does look like a 12X12 APC will work.
something like 9100 on the ground and 10000 in the air. At least thatís what I was thinking. That little P51 should scoot then.
Old 01-20-2020, 06:57 PM
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Jim, in that second link I think there's a typo. No way an FA100 will turn an apc 14x8 at 9600. That almost 2 hp! All the other numbers make sense as the engine tested was probably not fully broke in yet and was making somewhere in the neighborhood of 1.7 hp.
Old 01-20-2020, 07:06 PM
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Originally Posted by Captcrunch44
Thanks
it does look like a 12X12 APC will work.
something like 9100 on the ground and 10000 in the air. At least thatís what I was thinking. That little P51 should scoot then.
Read my previous post, your 100 is going to spin that 12x12 apc at 9900 to 10k peak on the ground!

Last edited by Glowgeek; 01-20-2020 at 07:11 PM.
Old 01-20-2020, 07:09 PM
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Would you all like for me to test an apc 12x12.5 on the 100 tomorrow?
Old 01-20-2020, 08:33 PM
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Originally Posted by Glowgeek
Jim, in that second link I think there's a typo. No way an FA100 will turn an apc 14x8 at 9600. That almost 2 hp! All the other numbers make sense as the engine tested was probably not fully broke in yet and was making somewhere in the neighborhood of 1.7 hp.
I see that now, it makes you wonder

Jim
Old 01-20-2020, 08:34 PM
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Why not?!
Old 01-20-2020, 08:38 PM
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Originally Posted by Glowgeek
Would you all like for me to test an apc 12x12.5 on the 100 tomorrow?
yes Sr, I would, cause I am going to put my FA 100 in a yeller WM .60 size racing mustang


Jim
Old 01-21-2020, 01:44 AM
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Originally Posted by FlyerInOKC
Now if you just had a FA125 to throw in the mix...

Somebody wants a 125 ?????
Old 01-21-2020, 01:47 AM
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Who wouldn't want a 125? I know I would!
Old 01-21-2020, 03:36 AM
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A 125 is one of the three Saitos that I kept., dont really need it.
I'll tear it down and let you know.
Old 01-21-2020, 05:30 AM
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Originally Posted by Glowgeek
Would you all like for me to test an apc 12x12.5 on the 100 tomorrow?
that would be so cool
I would but I still need to get a 12x12
Old 01-21-2020, 06:01 AM
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15x8 Eflight prop on my 100 turned 8700 on the ground. It is what I have in my Cub. If you want a Cub that performs like an F-15, I recommend it. Runway? I no need no stinkin runway! With that combo the Cub can practically be hand launched.
Old 01-21-2020, 06:12 AM
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"15x8 Eflight"

Isn't that a lightweight prop for electric motor applications?
Old 01-21-2020, 06:37 AM
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Originally Posted by Jesse Open
"15x8 Eflight"

Isn't that a lightweight prop for electric motor applications?
errg, not eflite, Evolution! The big E was all I remembered and thought eflite.
Amazon Amazon

Cant even get them anymore, and was quite mad that I broke one on my Biper Cub.

Old 01-21-2020, 06:49 AM
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Your CRS must have kicked in! I'm kind of old school I love wooden props.
Old 01-21-2020, 06:51 AM
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Originally Posted by FlyerInOKC
Your CRS must have kicked in! I'm kind of old school I love wooden props.

Yeah, thats what happens when I am 60 miles from my planes and haven't seen them in months.

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