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Saito 91 in a Seagull Fairchild PT-19

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Saito 91 in a Seagull Fairchild PT-19

Old 08-11-2018, 10:04 AM
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dbeeler
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Default Saito 91 in a Seagull Fairchild PT-19

hello, i am looking for input or recommendations regarding a plane/engine "match". i currently own a Saito 91 4-stroke engine that i want to find a plane for. i am very interested in the Seagull Models Fairchild PT-19 ARF for this engine. the specs of the plane is as follows: wing span 80.5", wing area 965.7 sq in, approx flying weight: 11.9 lbs. recommended engine: 2 stroke: 91-1.20 cu in; 4 stroke: .91-1.20 cu in.
first, the engine specs do not make sense. it seems to me one of them is wrong as it typically takes a larger 4 stroke engine displacement to equal 2 stroke. i phone SIG as the sellers of this plane and did not get a definitive answer.
having said that, i am wondering if i will be disappointed in performance with the Saito 91 in this airplane. it seems a bit on the "heavy side" for this "minimum" engine. keep in mind i don't expect nor care about unlimited vertical and tons of power. but i am wondering if for scale flight, some loops and rolls, and good power on take off will be acceptable. i would appreciate your thoughts. thank you in advance.
Old 08-11-2018, 10:47 AM
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while the Saito 91 engine is a great engine I personally think you will soon be wishing you had put a larger engine in that plane !, find a smaller plane for the engine, maybe a SIG's 4 Star 64, that would be a better match

Jim
Old 08-12-2018, 03:23 AM
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It doesn't take a larger four stroke any more, think in terms of flying power rather than paper horse power.
Old 08-12-2018, 10:30 AM
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Hobbsy, thank you for your comment. forgive my ignorance but would you mind explaining it further please. at the same time, it appears that you believe the "match" would be OK?
Old 08-12-2018, 05:30 PM
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something is wrong with the site. let me post again

Jim
Old 08-12-2018, 05:41 PM
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sorry !! the site will not let me post everything I have typed, the site has done this to me before, and RCU would not help me with the problem

Jim

Last edited by the Wasp; 08-12-2018 at 06:33 PM.
Old 08-13-2018, 04:31 AM
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Originally Posted by the Wasp View Post
sorry !! the site will not let me post everything I have typed, the site has done this to me before, and RCU would not help me with the problem

Jim
Strange stuff. I've had some nice pictures disappear without warning or explanation!
Methinks someone with strong influence took exception

On the other hand,

That PT should do well with the Saito 91. I had one one a similar sized Spacewalker that had a good margin of reserve power.

Now, if you have a FA-115 on hand.......

Last edited by Jesse Open; 08-13-2018 at 07:41 AM.
Old 08-13-2018, 05:50 PM
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it's still not let me post it all

Jim
Old 08-13-2018, 05:55 PM
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this is part of what I wrote !!
I think Dave is getting to the fact that engine size is not every thing, and that you can get the thrust you need for that plane from the Saito 91 by using the correct prop,
my Saito manual says the 91 can turn up to a 15X4 prop, it's an 11+ pound plane with an 80 inch span, the 15X4 will do it, yet your top speed would suffer a bit with only a 4 inch pitch


Jim

Last edited by the Wasp; 08-13-2018 at 05:59 PM.
Old 08-14-2018, 04:55 AM
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My dad aways said a 700 HP Ferrari engine wouldn't work as well as the 470HP engine in his Caterpillar D9 bulldozer.
Old 08-14-2018, 07:41 AM
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Originally Posted by Jesse Open View Post
My dad aways said a 700 HP Ferrari engine wouldn't work as well as the 470HP engine in his Caterpillar D9 bulldozer.

yeeaa, but it would smell better and sound better

Jim
Old 08-14-2018, 07:52 AM
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thank you Jim. the prop that i have used with this engine on the previous plane (Aeroworks 60-90 size Extra260) is a 14x8 or 14x6... that is a smaller and lighter plane than the PT-19. the prop spins at about 9200 RPM. i have some things to learn about the difference in props. i dont really care about "top speed" so much as in flying fast. i am interested in flying scale with this plane and having enough thrust for take-off and climbing out and a larger loops. and i dont want to have to run full throttle all the time to get performance
dave
Old 08-14-2018, 08:08 AM
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Originally Posted by the Wasp View Post
yeeaa, but it would smell better and sound better

Jim
Maybe the smell but I always liked hearing that Cat at work! Besides, the Ferrari would have a stroke just as soon as the blade dropped!

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