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Apr 30, 2021, 11:03 AM
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Engine recommendations


Looking for input on engine recommendations for a Stinson SR10. This is a 125Ē WS, 34 pound plane. I just purchased the kit and obviously have quite some time to purchase an engine but am not sure what to get. I would love a 3 cylinder radial like the Saito FA450R3 but donít know if it has sufficient power for this application.

Any insight would be greatly appreciated!

Thanks in advance,

Curtis
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Apr 30, 2021, 11:22 AM
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JimboPilotFL's Avatar
Here is one on YouTube with an 80cc gas twin cylinder. Seem about right.

Stinson Reliant SR-10 - Maiden Flight (7 min 22 sec)
Last edited by JimboPilotFL; Apr 30, 2021 at 11:27 AM.
Apr 30, 2021, 11:24 AM
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Originally Posted by JimboPilotFL View Post
Here is one on YouTube with an 80cc gas twin cylinder. Seem about right.
Awesome. Iíll check it out. Thanks
Apr 30, 2021, 03:24 PM
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koppterX's Avatar
what an incredible project. i think a 80cc to 100cc would be about right. i have an 85cc on a 122 Decathlon but it's under 30lbs and is quite aerobatic. If you are pushing 35 lbs I wouldn't rule out a DA 100 or something similar. Radials are way cool, Moki has some big ones.
Apr 30, 2021, 03:38 PM
A man with too many toys
You need a Saito FG-73R5 73cc 5-Cylinder radial. Next shipment is June so get on the lost before they are all spoken for. Check the measurements to see if it will fit the cowl.

I am thinking of getting one just to have it on hand. No telling when they will stop making them.


.
Apr 30, 2021, 03:47 PM
Still gassin' it.
Quote:
Originally Posted by RC Man View Post
You need a Saito FG-73R5 73cc 5-Cylinder radial. Next shipment is June so get on the lost before they are all spoken for. Check the measurements to see if it will fit the cowl.

I am thinking of getting one just to have it on hand. No telling when they will stop making them.


.
For a radial, I would probably go for the higher side. of 100 cc displacement: Fourstrokes are less powerful than equal displacement 2-strokes, and radials are less powerful than twins or singles of equal displacement.

That IS most definitely a good looking engine (and so far none of the scary stories like the triples), but for a plane like in OP, I would probably go for a 125 cc radial at least. IF it had to be a radial...
Apr 30, 2021, 03:47 PM
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koppterX's Avatar
I want to add that 35lbs seems wildly optimistic. I’m thinking mid to high 40s.
Apr 30, 2021, 03:47 PM
A man with too many toys
73R5 Dimensions:

Looks like it's 230mm diameter.

.
Apr 30, 2021, 03:48 PM
Still gassin' it.
Quote:
Originally Posted by koppterX
I want to add that 35lbs seems wildly optimistic. Iím thinking mid to high 40s.
Dunno... the plane in post 2 is claimed to be 130+" wingspan and only 28 lbs...
Apr 30, 2021, 03:57 PM
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koppterX's Avatar
Not a chance that’s correct. 35% aero bats with wingspans of 105 in are 28 ish. And they’re light.
Apr 30, 2021, 04:08 PM
A man with too many toys
Quote:
Originally Posted by JimboPilotFL
Here is one on YouTube with an 80cc gas twin cylinder. Seem about right.

https://www.youtube.com/watch?v=qJhgfY2v0As&t=1s
I have always thought that those big 2-stroke gassers were way too noisy. Get a 4-stroke!

.
Apr 30, 2021, 05:11 PM
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Thread OP
Quote:
Originally Posted by RC Man
You need a Saito FG-73R5 73cc 5-Cylinder radial. Next shipment is June so get on the lost before they are all spoken for. Check the measurements to see if it will fit the cowl.

I am thinking of getting one just to have it on hand. No telling when they will stop making them.


.
Very nice looking!!! Appreciate the info.
Apr 30, 2021, 05:13 PM
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Quote:
Originally Posted by 1967Brutus
For a radial, I would probably go for the higher side. of 100 cc displacement: Fourstrokes are less powerful than equal displacement 2-strokes, and radials are less powerful than twins or singles of equal displacement.

That IS most definitely a good looking engine (and so far none of the scary stories like the triples), but for a plane like in OP, I would probably go for a 125 cc radial at least. IF it had to be a radial...
That was my thoughts also. Would need to go bigger in a four stroke to make it work!

I’m not dead set on a radial just love the way they sound!

What problems are you referring to with the triples?
Apr 30, 2021, 05:15 PM
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Thread OP
Quote:
Originally Posted by koppterX
I want to add that 35lbs seems wildly optimistic. Iím thinking mid to high 40s.
Iím not sure of the weight. Just quoting the websites advertised weight.
Apr 30, 2021, 05:17 PM
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Thread OP
Quote:
Originally Posted by RC Man
73R5 Dimensions:

Looks like it's 230mm diameter.

.
Thanks. The kit is supposed to arrive Sunday. Iíll check the measurements.


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