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Old 10-09-2018, 02:29 AM
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My FA 30 being wrung out by DMRC, It did well, I have become a fan of his videos on You Tube. I can't find where he did a Saito 100, I'll keep looking because I'm sure he did.

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Old 10-09-2018, 04:20 AM
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Looks like video has been pulled from YouTube.
Old 10-09-2018, 06:08 AM
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Originally Posted by FlyerInOKC
Looks like video has been pulled from YouTube.
No I just have not made it public yet. Dave is on my list to view videos before they are made public.
Old 10-09-2018, 06:12 AM
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that would explain it.
Old 10-09-2018, 07:24 AM
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Originally Posted by Rudolph Hart
Mike on the big block saito's i like to run wooden props,they are expensive to crash but you can gather up all the wooden splinters and use them to start the bbq after a few beers.

Dave i don't like your chances about begging off on apc props,that's like saying you once owned a 57 chevy but can't recall a damn thing

Does anyone remember a post and pic of the top rpm spec sheet fromsaitoi put up ages ago about the saito fa30 sc? apparently it pulls 22,000 rpm which got me thinking that i read an article years ago where guys where doing a prop shear to peak the nelson racing two stroke engines,said they got a few hundred extra rpm with the right engine but they blew a few too.Now,just imagine you have a saito fa82 on the bench and it's slobbering rich at full throttle and about 5000 rpm.If you did a prop shear then how many rpm do you think you would see before the 82 went yeah nah,or has somebody already done that?

Got me thinking! I have a pair of the later 40a Saitos. A few months ago one fellow put a big flywheel on a little engine to see how slow he could run it.
How about I take one of these 40 Saitos and put a flywheel on it. I can then start it blubbering rich, full throttle governed to 5,000 RPM initially by mixture strength. I can then keep leaning it out gradually . We can increase the speed with the needle in 500 RPM increments, 15 seconds at each interval. Could be entertaining to see at what point that little rod finally gives up. The engine is one I will never use and I am not a "collector" so no great loss after all.
Old 10-09-2018, 10:04 AM
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Quick question !

I have a saito 82 on a Hangar 9 ultra stick. Took it out for a spin, had the HS set about 500 rpm rich and running it with 7.5 % nitro ( I know thatís a bit low but itís what I had lying around ).

The first two flights where great but i did keep it higher and about half throttle. But no dead sticks or anything. On third and fourth flight I was flying lower with lower power about a third throttle doing lazy 8ís etc

On both occasions about 2/3 min into the flight the motor would burble and lose rpm then die a few seconds later.

Would this be a misture setting ? Maybe LS a bit rich ? Or would the fuel be the cause ? Low power low nitro and the glow plug just cooling down and motor dying ?
Old 10-09-2018, 05:06 PM
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Pete, check it out


Old 10-09-2018, 07:12 PM
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Hobbsy, Saito 100 video you say, here you go


Jim
Old 10-09-2018, 07:18 PM
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David McIntire,, I have a question, I saw your test video of your HB 61, would you know if the 61 PDP version is more or less powerful ?? I have a 61 PDP NIB..

thanks all those great videos !! I'm going to watch the Saito 100 video now.

Jim
Old 10-10-2018, 12:07 AM
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Originally Posted by the Wasp
David McIntire,, I have a question, I saw your test video of your HB 61, would you know if the 61 PDP version is more or less powerful ?? I have a 61 PDP NIB..

thanks all those great videos !! I'm going to watch the Saito 100 video now.

Jim
I would say in theory the PDP is supposed to be more powerful, but I cannot say for sure. The word 'powerful' is not very descriptive. It is an old design and slightly more 'modern' ABC 61 two stroke would turn a higher peak RPM in my estimation. Like an OS 61 SF,
Old 10-10-2018, 01:21 AM
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Dave, now this is made public.

Old 10-10-2018, 02:26 AM
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Originally Posted by the Wasp
David McIntire,, I have a question, I saw your test video of your HB 61, would you know if the 61 PDP version is more or less powerful ?? I have a 61 PDP NIB..

thanks all those great videos !! I'm going to watch the Saito 100 video now.

Jim
Jim,

In a word, Yes, they are more powerful than the standard HB 61. I had both types in my Taurus back around 1980 . Can't tell you the actual RPM differential but it pulled stronger on every prop I used .
Clarence Lee also performed the Perry magic on K&B engines back then and afaik still does.

While not as potent as many of today's two strokers, the HB is still a fine, durable engine that would work very well for sport or scale flying. That .61 PDP did a fine job of hauling the 9 1/2 pound, 1963 Taurus around for the last years of it's fuel soaked life


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Old 10-10-2018, 03:26 AM
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The vanes for the 90 T's pump came yesterday, I'll install the new vanes and new rotor today some time. The original vanes are warped and don't slide in their slots very well.
Old 10-10-2018, 03:43 AM
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Originally Posted by the Wasp
Hobbsy, Saito 100 video you say, here you go

https://youtu.be/kjChPLUj7XQ

Jim
I my humble opinion the 100 in the video is a shaker because the prop is too big, I consider a 15 x 8 to be a 120 to 125 sized prop. Torsional impulses are greater when the load is greater. Strong power pulses plus light engine equals shake. These are my thoughts anyway, I could be persuaded to think otherwise by a new line of reasoning. Thanks Jim and David

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Old 10-10-2018, 03:53 AM
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Unsure why I chose that particular prop for that run other than it was one listed in the manual. Sadly that Saito FA-100 video is the only one I have on my channel. Oddly enough the 100 is the one Saito engine that I have read the most negative things about. Personally, I would never buy one based on the things I have read and my experience with that engine.
Old 10-10-2018, 04:11 AM
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Are you sayin you could be a potential fa115 convert? god bless you

Jim now you got me interested watching that vid of the fa30sc running in the model car,i need to find a vid of that where it's not just idling but getting it's nuts revved off.Reason i say that is because it sounds nothing like my own fa30 at high idle,it sounds a bit lumpy.

Dave the fa115 runs as smooth as a babys bum with a mas 15x8 except at idle where it shakes the mustangs wingtips.

Gary thought about your suggestion to run a flywheel and it makes a lot of sense,how would you calculate the right weight so that the engine is not overloaded on throttle up or at the other end of the scale the flywheel will keep accelerating after a throttle up?
Old 10-10-2018, 04:17 AM
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I currently have two, one with CH Ignition and one with glow plug ignition. The glow one is newly rebuilt, I will run it in a couple of days with a 15 x 6 and we'll see what happens. I've had a 100 since they first came out, I had a brand new 91 GK and traded it off to get the 100. Same sort of story for the 115, it became a short timer when the 125 came out. Fickle ain't I.
Old 10-10-2018, 04:25 AM
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Here you go Pete, this will tame the 115.
Old 10-10-2018, 04:39 AM
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Originally Posted by dmrcflyr2
Dave, now this is made public.

https://youtu.be/wSsTNskI2jU
The little header pipe is available here: https://www.horizonhobby.com/muffler...A-tt-sai90r374
Old 10-10-2018, 05:06 AM
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Originally Posted by Hobbsy
I currently have two, one with CH Ignition and one with glow plug ignition. The glow one is newly rebuilt, I will run it in a couple of days with a 15 x 6 and we'll see what happens. I've had a 100 since they first came out, I had a brand new 91 GK and traded it off to get the 100. Same sort of story for the 115, it became a short timer when the 125 came out. Fickle ain't I.
I have been a bigger fan of what I call the 'classic series' of Saito's. The 45, 50, 56. 65. 80, 91S, and 120S. I do not currently own a 100, 115, or 125. I could have a 125 if I had the money for it as a subscriber has offered me his. I offered a trade but he preferred money to any trade.
Old 10-10-2018, 05:27 AM
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Originally Posted by Rudolph Hart

Gary thought about your suggestion to run a flywheel and it makes a lot of sense ,how would you calculate the right weight so that the engine is not overloaded on throttle up or at the other end of the scale the flywheel will keep accelerating after a throttle up?

There are some guidelines regarding LARGER flywheels in the older "Machinists Handbooks" Would give a good idea of a starting point. The main thing to mind however is the "hoop strength" at the projected RPM. That involves material strength and mass at the surface speed for a given radius and RPM. We don't want to see the flywheel explode, just the little FA-40a! We had to run similar numbers back in 1978 when we made the slipper clutch for our supercharged, twin engine Triumph drag bike. Nice thing, being here and having real engineers about to " proof read " our numbers

Originally Posted by Hobbsy
The little header pipe is available here: https://www.horizonhobby.com/muffler...A-tt-sai90r374
Also available here. I have about a dozen of the factory stacks for the little radial on hand.Let me know if you need a few.
I just sold a pile of Saito exhaust bits last week. Cleaning out the bins .
Old 10-10-2018, 06:49 AM
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New vanes installed, confession is due, all four vanes are facing the wrong way and the rotor needed to be reversed, the shoulder you see needs to be inside. Lived and learned before I wrecked it. It's all back together now and turns freely. Freely is good.

As you can see it cooked some castor before I got it.

Last edited by Hobbsy; 10-10-2018 at 06:50 AM. Reason: Add content
Old 10-10-2018, 07:02 AM
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Too much of a good thing
Pity the previous operator didn't cut back to the magic 2% to 4% level.
Old 10-10-2018, 10:36 AM
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Gary and Dave M, thank you for replying to my HB question, just to add to what you two said, back when I bought this engine some 10 years ago, I did call Randi at MECOA, well in short, he told me that the HB should turn a larger prop than my OS 61FX, I will have to run it some time and find out,,

bet you guys can't guess what I paid for it, well I hate to say it, but I bought 3 of them NIB for>>>> $10 each, 2 of them were Heli engines and I soled them..

BTW, I just sold and shipped out a never started Super Tartan 22cc

JIm
Old 10-10-2018, 10:40 AM
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Pete, that Saito 30 Car engine has me thinking too, I'm wondering if it has a different Cam than the plane engine LOL

Jim

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