the Wasp

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yes, 4.50, my MVVS was a 2.10, but a smelly 2St LOL... it would have needed, somewhere around a 270 4St to be equal

https://www.towerhobbies.com/conversion-calculator.html

I say search YT for the Saito 4.50 and see what people are putting it in.

Jim

the Wasp

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here is a 92" BH Gilmore Red Lion with a Saito FG60R3 in it

https://www.towerhobbies.com/conversion-calculator.html

1200SportsterRider

A few days ago on these pages, someone asked about the former Bowman piston rings. Now, RMJ Machine Worx, yesterday AM I ordered a ring for a Saito 56 and for a Saito 82. I ordered them gapped at .001". They will be here Monday, that's good service.

https://rmjmachineworx.com/online-st...tegories/saito

Glowgeek

That's fairly tight. New Saito rings that I've measured 2/3 of the way down the bore have measured in the .002"-.003" range. Hopefully your .001" gap will provide enough lube for the lower end of a 4 stroke.

1200SportsterRider

My take on that is that more oil gets past the piston ring than goes through the gap. On two of the up strokes,(compression and exhaust), and one of the down strokes, (combustion) there is pressure above the ring. That's mee thinkin anyhoo.

I'll report and do a before and after with the 82-b.

Hyjinx

Thanks Jim
Similar design airframe, similar size. My plane is well constructed from a framing standpoint scratch built.
My concern is with a similar size single the vibration would grenade the framing either immediately or over subsequent flights. A 77 cc radial is roughly 60% of the power comparison between a single gas two stroke.. So I am thinking this would be similar to like a forty cc single in power. With a much smoother and forgiving power band.
Thanks for the input.
Aaron-

Hyjinx

Hey Lonnie
Nope. The R5 has a nice home on a lightly constructed GP 72 inch Super Stearman. The arf weighs in at 12.5 pounds motorless. Many hours and hundreds of flights. Landing gear suffers with crappy landings but the airframe has been able to stay intact with this 53 cc radial.
BUT I am a half throttle radial nut. The full size engines usually turn 2200 rpm at cruise, and usually didn't exceed 4000 in engagement. Usually for a short time as well. I typically dont leave the ground anywhere near full throttle. Back off to less than half once on the circuit. Then cruise low and slow to enjoy the sight and sound. My Saito 450 is on a larger heavier bipe, also well constructed from scratch. The three cylinder is MUCH more powerful at 77 ccs. Weight of motor and ring very similar. It pulls the 24 pound airframe like a rocket. It's cruise is close to an high idle with a 24/10. Super torqued with that prop, loads the motor and tones the torque down nicely.
Spoiler alert. Probably actually intending to install my Seidel 77cc seven clyinder on this plane, didn't want to get the moderators blood pressure up being off topic again. The more the cylinders the smoother the power band. (In my experience any way)Lol the mystery ship was a racer, it is begging to go faster and like the Gilmore and gee bees, had a bigger radial than the pilot could see over. This plane is begging for one of my collection. Half tempted to put my Technopower 90 cc nine cylinder on it for static display. It is American made which matches the airframe. But not very practical to run due to many known issues with these Tek-no-power radials. lmao

Hyjinx

Nope Gary
That one is still on the fly baby bipe I picked up in Toledo.

Hyjinx

Nope GaryThe R3 450 is still on the fly baby bipe I picked up in Toledo. It's very happy there.

Jesse Open

OK, got it. Had no idea.

Glowgeek

Would still like to see pics of the mystery racer plane Aaron. Yeah, I've heard nothing good about those Tech-NO-Power engines. Would look awesome for a static display!

Hyjinx

I just can't decide what to do with Dave's plane Gary. The gasser needs to go. And it begs for the original radial power plant. It's such a nice plane. Should probably sell it to someone who is ok with gas two strokes. It starts and runs like a clock. And has NO chicom trinkets or batteries to make it spark....

vertical grimmace

My Feedback: (1)

Does anyone know on the FA 180 if the muffler size changed in any way compared to the newer 180 B version? I need to get a muffler for the older 180 and want to make sure I get the right one.

Glowgeek

The threading size hasn't changed, still M14x1 but the style has changed. The old header had 60° bend and the muffler threading was on the end. The new style has a 75° header and the muffler threading is on the side.

vertical grimmace

My Feedback: (1)

Thanks for the info. But I guess I do not understand what you mean by "threading on the side". Would a new muffler thread onto an old header, or would I need to replace both?

Glowgeek

The headers new/old are similar and may work for your aircraft, depends on the angle needed.


New style muffler

Old style 180 muffler

Jesse Open

Diectly interchangeable. In some cases the early exhaust pipe works out well with the later, cast trash can style silencer. Also vice-versa. The exhaust pipe threads being identical.

the Wasp

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they made that GeeBee Y with a 92" spread, people were putting 50s and 60s in them. I will try to find them on YT

Jim

the Wasp

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here you go, hear you go, a 95 incher GeeBee Y with 5 pistons and 10 rocker arms,



and a 92 incher GeeBee Y with a, whopping 3-W 75cc in her. the same brand as my 82 incher


Jim

vertical grimmace

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Thanks guys

the Wasp

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I don't think this is a Saito. it's a bit to big to be a Saito,

maybe it was designed after a Saito,

naa maybe not.


Jim

1200SportsterRider

If you watch that thing turn over slowly, it has dented cam lobes.

Hyjinx

Thanks Jim! Used those two for our hymns before service this Lord's Day. They both sounded a bit like amazing grace. Specially the one singing with five voices.
if that was yours and you flying it... I am inspired. The power managed approach was flawless. I have been practicing that landing approach this summer. There was a great series of articles in the AMA rag by a flying coach. Turned a light on for my marginal willy nilly landings. People don't have to sigh auggge nearly as often now lol.
absolutely beautiful set of planes. Loved the missing cowl over the radial! As Gary may say of me. That's my kind of stuff right there.
​​​​​​​Thank you!!!

Glowgeek

Perhaps, most likely just an optical illusion. Due to the grinds of both the cam lobe and tappets, as well as angles between the two, the tappets don't ride across the entire face of the lobe. With normal wear that leaves a dark spot in the middle of the lobe and shiny worn areas at the edges of the lobe. Once the lobes become shiny (worn) all the way across the cam is worn out.

Jesse Open

Lifter bores are often intentionaly offset from cam lobe center to promte lifter rotation. Cam faces often ground at a face angle.