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08-13-2020, 05:38 PM
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hey guys, I worked on my 4-star 60 "60" today a bit, what do you say> do you think my Saito 100T is too big/too powerful/too heavy for the 4-star 60 ?
oop, I have a brand new 4-star 64 cowl for it. if I ever get it done the 100T's heads and pipes will clear the sides of the cowl. how cool will that be ?
Jim
oop, I have a brand new 4-star 64 cowl for it. if I ever get it done the 100T's heads and pipes will clear the sides of the cowl. how cool will that be ?
Jim
08-13-2020, 05:57 PM
hey guys, I worked on my 4-star 60 "60" today a bit, what do you say> do you think my Saito 100T is too big/too powerful/too heavy for the 4-star 60 ?
oop, I have a brand new 4-star 64 cowl for it. if I ever get it done the 100T's heads and pipes will clear the sides of the cowl. how cool will that be ?
Jim
oop, I have a brand new 4-star 64 cowl for it. if I ever get it done the 100T's heads and pipes will clear the sides of the cowl. how cool will that be ?
Jim
08-13-2020, 06:37 PM
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08-13-2020, 06:40 PM
Ran another two 14oz tanks through my fa125 last weekend, it's now making rated power at 2.02 hp turning an apc 14x8 @ 9700 rpm. I'm impressed.
EDIT: Correction 14x8 at 9990. 2.2 hp.
Last edited by Glowgeek; 08-14-2020 at 04:20 AM.
08-13-2020, 07:25 PM
08-13-2020, 08:34 PM
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Well, an fa100 is plenty for a 4*60, an fa91 flies it good too. If the fa125 didn't impress you there's something wrong with it (Besides just being a 125).
Ran another two 14oz tanks through my fa125 last weekend, it's now making rated power at 2.02 hp turning an apc 14x8 @ 9700 rpm. I'm impressed.
Ran another two 14oz tanks through my fa125 last weekend, it's now making rated power at 2.02 hp turning an apc 14x8 @ 9700 rpm. I'm impressed.
da 100 will only turn the APC 14x8 at round 8,900, 9,000
Jim
08-14-2020, 01:58 AM
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At my house the choice would be a 15 x 8, he tested neither of the two best choices. The test reveals 2.35 hp which is not bad at all. That test is with the earlier cylinder, on the left.
Last edited by Hobbsy; 08-14-2020 at 02:03 AM.
08-14-2020, 03:18 AM
Deleted previous text....
Dave, I misinterpreted your post as saying the 125 made more than 2.35 hp using a 15x8 prop. That prop doesn't appear in the article but is a good choice on the right airframe. In fact, whichever prop they dyno'd the engine at 2.35 hp with doesn't appear in the article either. I've seen high numbers from that author's dyno machine before so another reason I set my own standards with apc props,15% fuel and F plugs. I'm not however saying that my testing reveals more accurate hp numbers, it's just a standard I set to test all of my 4 strokes.
I've even gone so far as to set my own anticipated hp using .103 X CC = HP. Using this formula the FA125 should make at least 2.11 hp. Again, just a tool for checking the health of my engines using displacement as the primary factor along with this Static Thrust Calculator.
http://godolloairport.hu/calc/strc_eng/index.htm
Dave, I misinterpreted your post as saying the 125 made more than 2.35 hp using a 15x8 prop. That prop doesn't appear in the article but is a good choice on the right airframe. In fact, whichever prop they dyno'd the engine at 2.35 hp with doesn't appear in the article either. I've seen high numbers from that author's dyno machine before so another reason I set my own standards with apc props,15% fuel and F plugs. I'm not however saying that my testing reveals more accurate hp numbers, it's just a standard I set to test all of my 4 strokes.
I've even gone so far as to set my own anticipated hp using .103 X CC = HP. Using this formula the FA125 should make at least 2.11 hp. Again, just a tool for checking the health of my engines using displacement as the primary factor along with this Static Thrust Calculator.
http://godolloairport.hu/calc/strc_eng/index.htm
Last edited by Glowgeek; 08-14-2020 at 04:53 AM.
08-14-2020, 04:46 AM
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I totally distrust fudge factors, you can alter any other factor to get the conclusion you want. I noticed that also, that neither the prop nor the 9,700 rpm are listed in his chart.
Last edited by Hobbsy; 08-14-2020 at 04:48 AM.
08-14-2020, 05:42 AM
as true as that maybe I would hate to break up my collection. I think I will have check for sure but when I get the 220 I should have all the Saito single cylinder 4 stroke engines except the 30 open rocker that one just always seems to be Expensive.
08-14-2020, 05:50 AM
Congratulations on having a near complete set! I know what you mean about open rocker engines being expensive. Back in 2004 when I decided to get back into the hobby I had a NIB single digit serial number open rocker OS .60 4 cycle. I sold the engine to a collector and bought a Futaba 6EXA, SIG LT-40 kit, Super Tigre .40, and the all in one field box kit from Great Planes. I had gotten out of the hobby back in 1981 after getting married and having our first child. The engine was the only thing I kept from my early R/C days.
08-14-2020, 06:09 AM
Last year a never run 30 open rocker sold for 150.00 on the classies. They rarely come up for sale and can had for a reasonable price but you have to beat the vultures to the feast. Some people seem to just live on the classies.
08-14-2020, 09:01 AM
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How would this 130 twin affect your collection. It's not perfect, the left exhaust rocker cover has a twisted off screw. It is held by a 2-56 x .125" screw in it's lower side. I'll head it your way in a day or two. The box is not so nice.
08-14-2020, 09:09 AM
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I am rebuilding another 120, the crank I'll be using appears to be from a FatHead 120, the cam drive gear is a sleeve that is notched like some of the 50/56's, and has black sleeve for spacer.
08-14-2020, 11:16 AM
Finally got out to fly today. The FG-11 just purrs. The fa-72 though, having some issues with it. at idle it doesn't slow down right away and then when it does it sounds like a loping harley. Transition is good, didn't measure peak, but noticed not a lot of difference in RPM when screwing in the HSN. On the last flight it started to bog when going full throttle in flight, and when going vertical the revs would go up, then come down. When I start it and pull the glow igniter off, the RPM's stay the same for a bit, then drop and lope. Never had issues with it before, so wonder what it might be. I finally got to actually fly the SSE and had fun with it, but with the engine acting up towards the end of the last flight I cut it short. I also got a second and third flight on a Radian glider I bought a couple years back. Flew two packs from 12v down to storage level, don't need to charge them. The first flight was a bit goofy, could not get the plane trimmed, and found a loose clevis, so replaced it, and the first flight today, just a touch of up trim was all it took. My second landing I put it right at my feet. My last flight with the LT-40 I landed it on one wheel, and then the tail touched and I turned it towards the other runway before setting the other wheel down, so I did a 1-2-3 point landing. LOL
08-14-2020, 11:16 AM
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whichever prop they dyno'd the engine at 2.35 hp with doesn't appear in the article either
I noticed that also, that neither the prop nor the 9,700 rpm are listed in his chart.
Saito FA-100GK
Jim
08-14-2020, 11:23 AM
Finally got out to fly today. The FG-11 just purrs. The fa-72 though, having some issues with it. at idle it doesn't slow down right away and then when it does it sounds like a loping harley. Transition is good, didn't measure peak, but noticed not a lot of difference in RPM when screwing in the HSN. On the last flight it started to bog when going full throttle in flight, and when going vertical the revs would go up, then come down. When I start it and pull the glow igniter off, the RPM's stay the same for a bit, then drop and lope. Never had issues with it before, so wonder what it might be. I finally got to actually fly the SSE and had fun with it, but with the engine acting up towards the end of the last flight I cut it short. I also got a second and third flight on a Radian glider I bought a couple years back. Flew two packs from 12v down to storage level, don't need to charge them. The first flight was a bit goofy, could not get the plane trimmed, and found a loose clevis, so replaced it, and the first flight today, just a touch of up trim was all it took. My second landing I put it right at my feet. My last flight with the LT-40 I landed it on one wheel, and then the tail touched and I turned it towards the other runway before setting the other wheel down, so I did a 1-2-3 point landing. LOL
If the airplane is reusable its a good landing!
08-14-2020, 11:56 AM
what about this one ??
https://youtu.be/Ezdd4GlTAec?t=9
https://youtu.be/Ezdd4GlTAec?t=9
08-14-2020, 12:05 PM