Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Sundowner questions

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Old 04-15-2008, 09:31 AM
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darren94
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Default Sundowner questions

I just purchased a sundowner 50 arf and i have read the huge thread on this plane. It seems as if everyone loves this plane and like most, my overall goal is AT LEAST 100MPH. I would like to see 120 but, we will see. Here is my question. I have a 46ax on the bench and a saito 82 on the bench both brand new. I think the 46ax will not provide the speeds that i am looking for and i am wondering how the 82 would do. I am prepaired to get a 75ax or a 91fx to attain those speeds. What motor would you recommend?
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Old 04-15-2008, 09:55 AM
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patzane
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Default RE: Sundowner questions

if you looking to use what you have now go with the Satio
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Old 04-15-2008, 10:09 AM
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Default RE: Sundowner questions

If you decide on another engine get the YS 1.10! It will get you 120mph+. Probley more like 130mph plus!

Justin
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Old 04-15-2008, 10:22 AM
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Default RE: Sundowner questions

i have been looking into the ys 1.10 but, what should i expect with the saito .82?
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Old 04-15-2008, 10:30 AM
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Default RE: Sundowner questions

Id avoid going at the big-block engine if possible. Folks that I have been in contact with, who have flown the sundowner with both "40" size and "61" size engines, noted that the weight pentalty for the bigger engine shows up in flight and landing performance. Adds an extra 1/4 lb to the plane at minimum.

The OS46AX can be combine with the jett muffler and produces very good power - prepare a similar installation as the photos I have in the big thread ( think the longer muffler will fit in a simlar fashion). With a 9x8, 10x6 or 10x7 prop it would be a combination that will very likely get you over the 100mph mark.

The Saito 82 ...... good engine. It will all come down to prop selection as to how fast the plane will move. Maybe something like a 12x10 prop ?
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Old 04-15-2008, 01:07 PM
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darren94
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Default RE: Sundowner questions

so, on the saito, prop selection is crucial. On the 46ax, pipe selection will determine the overall performance.
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Old 04-15-2008, 01:27 PM
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Default RE: Sundowner questions

just to clarify, your prop selection with the OS46 is important too. You have to balance the needs of the engine and airframe.

When you add performance using a tuned exhaust or tuned pipe, you have to select a prop that balances the engine/airframe/exhaust system.

So yes, the prop selection is critical for the tuned exhaust. The muffler has an RPM range where the tuned effect boosts power. In this case, You want to prop the OS46AX engine to run between 14,500 and 16,000 peak ground rpm to obtain best performance.

The 4c engine is RPM limited. So its the same deal with prop selection. You have a max target rpm (10,000 ?). You have to prop to the performance target, while also finding the best aircraft performance.
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Old 04-16-2008, 10:31 AM
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Default RE: Sundowner questions

Bob,

I just finished with the big sundowner thread and i am in love with your setup. I am about to order either the jet 60lx package or the ys 1.10. What would you recommend out of the two. I am concerned with high top speed, reliability and ease of use/install while still being able to "fun fly".
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Old 04-16-2008, 11:02 AM
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Default RE: Sundowner questions

Fast is always relative...

I have not flown the YS setup.... only seen the reports here. So I can really comment on that. The engine itself is outstanding - tons of power .. turns the crud out of a 14x10 prop.

The 60LX setup proved out at 130mph + as you can see above. It is a well behaved engine.. easy to use. Take the time to perform the run-in on it as instructed, and the rest will fall into place. I recommend using a bubble-jett tank to avoid any fuel delivery issues in a low-fuel condition.

If you order the engine, note the aircraft and request the "pieces" that go along with the engine for the sundowner installation.
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