Saito 91 in a Seagull Fairchild PT-19
08-11-2018, 10:04 AM
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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.
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.
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?
08-13-2018, 04:31 AM
#7
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.
08-13-2018, 05:55 PM
#9
My Feedback: (1)
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
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.
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
dave
08-14-2018, 08:08 AM
#13
