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

need help with sundowner 50

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Old 07-28-2008, 07:16 PM
  #1  
deadheaddave
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Default need help with sundowner 50

Got a sundowner 50 today and am trying to decide what engine to use. I have a thunder tiger 46 that just screams and a 91 magnum 4st. Will the 46 be enough or will the 91 be too much, has anyone used any of these engines in this plane? Am putting the plane together right now but am waiting to here some input from some of you before I decide on one of these engines.
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Old 07-28-2008, 07:46 PM
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patzane
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Default RE: need help with sundowner 50

I have a 2c OS 91 on mine and love it. There are a lot of folks putting the OS 55 which they say is a great combo for this plane. I few put a OS 46 but I don't remember if they wrote an undate on the how it did. If you looking for speed the 46 might be a little under power. Sorry if I did not help much
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Old 07-28-2008, 08:52 PM
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russm
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Default RE: need help with sundowner 50

the 46 is to small and the 91 fs is to big. i have the os 75ax w/ a pitts muffler on mine. nice combo. sounds like patz is having good luck w/ his 90 2s. i am thinking about installing my jett 90lx. it really all depends on what your looking for. the 75ax is a good compromise of weight and power.
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Old 07-28-2008, 09:12 PM
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deadheaddave
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Default RE: need help with sundowner 50

How about a super tiger 2st 90. I have one layin around but didnt really like the way it ran with an in cowl muffler, it would fun perfect for a few minutes and then all of a sudden die on me, no matter what I did to the adjustments. Even restricted the muffler to get more pressure but that didnt seem to work either. dont have the original exhaust so havent tried that yet.
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Old 07-29-2008, 04:06 AM
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panzerd18
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Default RE: need help with sundowner 50

Would the ST 2stroke 90 fit in the same mounting pattern that comes with the ARF?
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Old 07-29-2008, 12:41 PM
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Default RE: need help with sundowner 50

I think I would of had to drill new holes but I decided to go ahead and put my .46 thunder tiger in and see how it did, I know it runs great and is reliable but if it dont work out I think I'll go get a new engine, something along the lines of a .75 like russm said, or maybe a 80 size saito. Ill let you guys know how the .46 works out. Might fly it today if the wind calms down a little.
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Old 07-29-2008, 06:35 PM
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Default RE: need help with sundowner 50

Well it flew pretty nicely. A little under powered as russm said it would be,so not real fast. I ran it with a 10x8 prop but changed it over to a 12x6 when I got home I'll find out tomorrow how that works out. I'm sure I'll eventually get a bigger engine for it, but for now I think this will work enough for me to get used to the flying charictaristics of the plane.
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Old 07-29-2008, 10:36 PM
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Default RE: need help with sundowner 50

Take a 10x6 and 10x7 with you too. You might be surprised how well it will work if you let it turn up a bit.
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Old 07-29-2008, 11:14 PM
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Default RE: need help with sundowner 50

Ok, yah , sounds good, I'll try em all
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Old 07-30-2008, 12:09 PM
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Default RE: need help with sundowner 50

We have a racing class in our area that uses the Sundowner 50 with the TT Pro .46 and it is a good combination, not the fastest but makes for some very competitive racing. We are using an APC 10X7 or 10X6 depending on where we fly, (elevation wise). As still4given says, you will be surprised. The 12X6 and the 10X8 are going to be a little too much prop for the engine. You should be able to get at least 14,000, (after it is broken in), out of it with whatever prop you use.

Let us know what happens...

T.
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Old 07-30-2008, 09:14 PM
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Default RE: need help with sundowner 50

well, tried the 12x6 and was working my way down, got out to the field late so only got to the 10x8. Iknow I already ran this prop but I figured I would try them all at the same time. But anyway the 10x8 was by far the fastest of the two. The 12x6 had a lot more power on the take off but not enough in the air to keep the plane moving the way I wanted it to. So I'll try the 10x7 and 6 hopefully tomorrow, you guys are probably on the money with this. let you know how it goes.
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Old 07-30-2008, 11:38 PM
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Default RE: need help with sundowner 50

I've just put my OS 91 Surpass 4st in mine - fitted fine, just small clearance hole for the fins on top of the cheek, and below for the exhaust header. Had to plug and redrill the mounts 3mm wider each side. Muffler inside cowl - easy.

I've yet to finish and balance it, but will put the battery behind the servos if need be - will open up the covering underneath to gain access if this transpires, easy to match the white underside.

Planning on trying 13x7, 13x8, 12x8 initially.

Cam
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Old 07-31-2008, 06:59 AM
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Default RE: need help with sundowner 50

better reinforce the firewall area for the 90 4s.let us know how that combo works out.
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Old 07-31-2008, 07:18 AM
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camdyson
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Default RE: need help with sundowner 50

I've added extra internal triangular gussets to the interior of engine box and some around U/C plate too. All holes in firewall filled with hardwood dowel epoxied in, and redrilled for new mount. If engine tests show any issue, will externally brace engine box as well.

Just waiting on a new muffler for the OS and will be ready to balance and play.

Cam
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Old 07-31-2008, 07:32 AM
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Default RE: need help with sundowner 50

excellent, sounds like you have been down this road before
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Old 07-31-2008, 11:04 AM
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Default RE: need help with sundowner 50

We race the WM T-34 out here with the OS 46AX. A good prop for this combination is the APC 9.5x6. I would think that the Sundowner would have a similar drag profile.



ORIGINAL: deadheaddave

well, tried the 12x6 and was working my way down, got out to the field late so only got to the 10x8. Iknow I already ran this prop but I figured I would try them all at the same time. But anyway the 10x8 was by far the fastest of the two. The 12x6 had a lot more power on the take off but not enough in the air to keep the plane moving the way I wanted it to. So I'll try the 10x7 and 6 hopefully tomorrow, you guys are probably on the money with this. let you know how it goes.
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Old 08-01-2008, 05:19 AM
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Default RE: need help with sundowner 50

ChrisAttebery thats a very small prop for that engine, it must really scream!!
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Old 08-01-2008, 10:45 AM
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Default RE: need help with sundowner 50

The 9.5x6 turn about 17k on the ground.

We also use the 10x5 which turn about 16k.

The other prop I've seen is a cut down Bolly 9.5x7.



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Old 08-01-2008, 11:11 PM
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Default RE: need help with sundowner 50

Well guys just got back from the field with the sundowner. The best prop overall by far is the 10x7 with the thunder tiger .46, this thing was allmost twice as fast with the 10x7 compared to the 10x8, it was really suprising. I think this setup is going to stick. I like it , really smooth flying plane, good luck landing this thing with the 90 4st. I thought about maybe putting mine in but now I think it would be a little much. Let us know how it goes. Thanks everybody for the input on the prop situation.
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Old 08-03-2008, 03:21 AM
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Default RE: need help with sundowner 50

No biggy, you can always cut the motor and glide it in if the idle speed won't let it slow down. Glide will be brisk, but no more so than some of the F3D planes which glide in. Ditto some F5B gliders. We'll soon find out...

How's the stall speed on this thing anyway - anyone have problems with slow approaches?

Cam
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Old 08-03-2008, 04:45 PM
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Default RE: need help with sundowner 50

Hey Cam, I have a OS91 surpass thats looking for a new frame. Do you have any pics of install? Also would the adj GP engine mount work with the pre-drilled holes?
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Old 08-05-2008, 08:19 AM
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Default RE: need help with sundowner 50

Can't say about the adjustable mount - I used the H9 one supplied after re-drilling and moving hole out 3mm each side.

I'll post a couple of pics of the result....

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Old 08-05-2008, 08:20 AM
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Default RE: need help with sundowner 50

Few more...

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Old 08-05-2008, 12:07 PM
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Default RE: need help with sundowner 50

very nice. it looks real good. I think my 91 may have found a new home. what spinner is that?
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Old 08-05-2008, 12:57 PM
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Default RE: need help with sundowner 50

I am doing the SJ60LX from Jett Eng. What prop would you guys use with it?
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