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RE: Sundowner 50 Arf
Get the 60LX...it will run trouble free forever and the weight is much much less. YS engines can be such a hassle and seems like at least every 16 months have to be sent in for repair. Look at it this way.....try and find a used JETT motor, and then try and find a used YS 1.10 or .91 . No one sells their Jett''s and for good reason.
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RE: Sundowner 50 Arf
ORIGINAL: darren94 so, is is safe to say that the 2 "fastest" setups would be a YS 1.10 or the Jett 60LX setup like bob? i am about to pull the trigger on one of these motors? Which one?? i cant decide You will be happy with either one. They will probley both be about the same speed. Each jet motor is made to order and takes about 4 weeks. The YS motors are ready to ship. I just think it would be sweet to have a supercharged 4-stroke. They sound cool to. I have a Jett 60 lx on order right now but my next engine is going to be a YS 110. Justin |
RE: Sundowner 50 Arf
what about the weight issue with the 110 compared to the 60lx? i dont want to create any bad characteristics of flight by going with the heavier motor.
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RE: Sundowner 50 Arf
Do you have to modify the engine mounts to fit in a 75AX? Or do you have to use a 46 sized 2-stroke for it to fit like 46/55AX?
Which would be faster, a 55AX or 81 Saito? What is the biggest 4 stroke you can use and still use the stock engine mounts? Also will putting a big 4 stroke in make it way too nose heavy? My World Models Sky Raider Mach 2 with OS 46AX flies fast with a 11x7. I want something faster than this. So would the Sundowner and 55AX be a noticeable steep up? |
RE: Sundowner 50 Arf
An 11x7 is HUGE for speed on the 46AX. I would run a 9x8 or 10x7 apc.
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RE: Sundowner 50 Arf
Yeah, 10x7 seems to be the sweet prop for that engine. Puts it right in to the best rpm range.
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RE: Sundowner 50 Arf
How well would a 10x8 or 7 work with the 55ax stock muffler on the SD.
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RE: Sundowner 50 Arf
Should work fine......
Key to the engine, regardless of the exhaust system, is to try and prop it to turn peak ground rpm around 13,500 - 15,000 A 10x7, 10x8 or 11x6 will put you in low-mid of that range with the stock exhaust. Yes, the engine will run ok with more prop and at lower rpm (11x7, 12x4, 12x5 props are not too bad, but down around 11,000-12,000). Just not developing its best power potential there. If you add a jett-stream muffler, the 10x8 and 11x6 work great, and will slide you toward the top of the rpm range. |
RE: Sundowner 50 Arf
I have a .55ax on my Pulse XT. It has a Ultra thrust muffler. With 15% fuel and a 10 x 7 prop it turns 15,600. That pushs my Pulse to 115-118mph straight. I bet it would push the sundowner to 120-125.
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RE: Sundowner 50 Arf
Yeah, that sounds about right..... Good info there.
15,600 is performing well and making good power. We tested at 15,500 with the 55ax/jett-stream combination on a 10x7, and about 14,100 with the stock muffler (15% fuel). The 11x6 came in just at 14,900-15,000 with the jett-stream and 13,400 with the stock muffler. A 10x8 is about the same. What I found though was the 55ax with the jett-stream muffler (and probably with the ultra-thrust... tune point is similar) was you wanted the ground peak rpm at or down a bit below 15,000. In flight it unloads another 500-800 rpm, and really stages up on the muffler very well. So the 11x6 and 10x8 props fit that profile nicely. The engine runs great propped for 15,500-16,000 rpm but it is sorta running-on-the-governor, and does not gain a great in flight. For some aircraft this is just fine. For the Pulse it is probably perfect for well balanced performance, great throttle response, and some top end speed. |
RE: Sundowner 50 Arf
Yeah im really happy with the .55ax/Ultrathurst combo. I have a 10 x 8 and may try it on the pulse to see what happens. I will try and get some video of it this weekend. My Jett .60lx will be here tomorrow and I almost have my Phoenix model strega done. So I may take some video of it this weekend too. Im hoping for 135+ with the P-51 strega and jett .60LX. I think Im going to try a 9 x 9 and a 9 x 10. Still4given uses a 9 x 9 on his Strega with a Jett 50. He said it really moves out good with that combo.
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RE: Sundowner 50 Arf
skip the 9x10 too big - won't hit the rpm target needed.
Only use a 9x9 after you have about half an hour on the engine and are certain about how it runs for you. From what I have seen of the plane (strega), its probably worth trying one of the 8.8x8.75 props (d1 pylon prop) and maybe the 8.8x9.25 cut down to 8.25" diameter. Might surprise you :) |
RE: Sundowner 50 Arf
Hey Bob,
I've got a question for you. I was wanting to use the Black pipe with this motor but dub said it wont work. I told him I was going to use a 9 x 9 and he said the gold pipe would be the only one to work. Does this sound right? Souldnt I be able to use the black pipe with this prop range? I would think the shorter black pipe would equal more rpms. What is the biggest prop you would want to use with the black pipe? Since your saying the pylon prop might work well with this plane it really makes me want to use the black pipe.[:o] Thanks Justin |
RE: Sundowner 50 Arf
I am using the gold pipe on my SJ50. The 9x9 was a little much with the red pipe.
Blessings, Terry |
RE: Sundowner 50 Arf
Would the Jett stream muffler work on the SD and the 55ax with out any mods? Looks like its to long and would hit the fuse. Thanks
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RE: Sundowner 50 Arf
ORIGINAL: Yellowsierra02 Hey Bob, I've got a question for you. I was wanting to use the Black pipe with this motor but dub said it wont work. I told him I was going to use a 9 x 9 and he said the gold pipe would be the only one to work. Does this sound right? Souldnt I be able to use the black pipe with this prop range? I would think the shorter black pipe would equal more rpms. What is the biggest prop you would want to use with the black pipe? Since your saying the pylon prop might work well with this plane it really makes me want to use the black pipe.[:o] Thanks Justin On the 60LX the biggest limitation is the internal volume of the black muffler. The black muffler works fine for the QM and Q-500 engines, and can sometimes be used on the SJ-46 and SJ-50. But has not shown to be very effective on the 60LX engine - this runs better with the gold muffler. The other consideration of the black muffler.... throttle, idle and and transition must be a low priority. Its designed for high rpm, and has a narrow range - does not stage or transition very well using the throttle. Not impossible, it does throttle, its just not going to be real smooth like the sport engine is suppose to be. |
RE: Sundowner 50 Arf
ORIGINAL: Brew07 Would the Jett stream muffler work on the SD and the 55ax with out any mods? Looks like its to long and would hit the fuse. Thanks Yes, it definately requires modifications to the fuselage. You would want to use an internal muffler installation. The installation would be similar to the photos I posted for the 60LX install. You have to re-orient the engine mount installation (rotate the engine a little), cut the firewall bulkhead air-cool opening a bit, cut internal structure a bit, and provide for the exhaust exit. I also consolidated the photos here http://www.jettengineering.com/sundowner.html |
RE: Sundowner 50 Arf
ORIGINAL: bob27s ORIGINAL: Yellowsierra02 Hey Bob, I've got a question for you. I was wanting to use the Black pipe with this motor but dub said it wont work. I told him I was going to use a 9 x 9 and he said the gold pipe would be the only one to work. Does this sound right? Souldnt I be able to use the black pipe with this prop range? I would think the shorter black pipe would equal more rpms. What is the biggest prop you would want to use with the black pipe? Since your saying the pylon prop might work well with this plane it really makes me want to use the black pipe.[:o] Thanks Justin On the 60LX the biggest limitation is the internal volume of the black muffler. The black muffler works fine for the QM and Q-500 engines, and can sometimes be used on the SJ-46 and SJ-50. But has not shown to be very effective on the 60LX engine - this runs better with the gold muffler. The other consideration of the black muffler.... throttle, idle and and transition must be a low priority. Its designed for high rpm, and has a narrow range - does not stage or transition very well using the throttle. Not impossible, it does throttle, its just not going to be real smooth like the sport engine is suppose to be. Hey Bob, Thanks for all your help. You have always answered my questions clearly. I really appreciate you taking your time to answer ALL my questions! After you telling me the difference of the black and gold pipe I am definatly glad I got the gold pipe. Thanks again Bob! Justin |
RE: Sundowner 50 Arf
What's your motor and battery set up for that Bobcat 50?
Jim ORIGINAL: z06kal Pilotoe I'm running a 12x12 @ 11,400rpm via electric on my bobcat 50. It does 118mph level flight like that on radar. I do have retracts but I honostly feel the retracts have no drag advantage on this plane as the retract setup severely disrupts the airflow across the fusalage and wings. I'm gonna be putting a higher KV motor on there and take it up to about 14,000rpm on the 12x12. Maybe pickup another 20mph if I'm lucky. |
RE: Sundowner 50 Arf
What's the set up you plan on using. (Motor/Prop/Battery) Jim ORIGINAL: z06kal Has anybody who has built a 130+mph sundowner 50 had to do anything to beef up the airframe? Any flutter? My buddy and I are putting together an electric one that should do 150-160. Plane is backordered and havn''t had a chance to go through the airframe and inspect it. |
RE: Sundowner 50 Arf
Anyone have an opportunity to fly their Sundowner this past weekend ?
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RE: Sundowner 50 Arf
This is one of the planes I fly every weekend
ORIGINAL: bob27s Anyone have an opportunity to fly their Sundowner this past weekend ? |
RE: Sundowner 50 Arf
Well, got my SD 50 on Tuseday night, purchased OS 55 on Sat. and did my maiden today. Using APC 11x7 to break in, getting just over 13,000 rpm. Will switch to 10x7 later on. This has to be one of the easiest ARF's I have assembled. Using Slimline pitts muffler, needed a little lead on the nose. Upon taxiing, noticed I had to give full down elevator to keep from nosing over, then it wanted to pull to left on take off but I had plenty of power with the 55AX. Few clicks down, one click left and boy is this a rocket and that was just at 1/2 throttle. I can only imagine with bigger engines, almost made me wish I got the big Sundowner. This plane is a little different than what I am used to flying, 3D, Warbirds, Giant Scale, twins..... Nice plane, reacted well, landed a little hot but I will get used to that.
R/C Foolish |
RE: Sundowner 50 Arf
I have a Webra .50 Speed that turns an APC 10x7 @ 14,200rpm on 0% Nitro with the stock muffler.
I also have an Ultrathrust for the engine that i haven't tried yet. How do you think the Webra will go on the Sundowner with the Ultrathrust and some added nitro? |
RE: Sundowner 50 Arf
LHS just called to say my SD has is here at last.:D Going to go with the OS 91 like patzane.
Patzane what prop you spinning now? If I use a pitts muffler will I still have to cut the cowl? |
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