Hi, I am relatively new to R/C planes. I currently own 3 airplanes GP Revolver with 75OS AX, Seagul Dual Ace twin engine (OS 55AX) and a H9 p51 150 (recently crashed!)

I want to get a plane for speed but looking for recommendation on model/engine combo, I was looking at the scale Sundowner model, can someone point me to post where I can get some advice or help on model/engine combos? something like 100-120mph I would be happy with.

I'd be willing to bet that if you put your revolver on radar you're already getting 100+ mph out of that. Speed is very deceiving, I've seen eagle 2 trainers on radar doing 70mph. Average sport plane will do 90 to 100. The revolver is a pretty clean plane. I'd look for a Quickie 500 type of plane, a viper, dominator, something like that.

Ditto on the revolver. I have a quickie with a Jett 40 that does about 125. The same day I saw some delta wings doing 115 and I would have thought they were doing 150. Speed is deceiving.

so is it possible to get 100mph+ with Revolver and OS 75AX swinging a 13x10 prop?

kiosk:

Like any other form of locomotion, the engine is the ultimate factor limiting speed. Yes, a clean low drag airframe is important. You can put a OS something on a viper and maby get it up to 120mph or a little more with the limited power and rpm's in the range of 14,500, or strap a Nelson or Jett racing 40 on it with rpms over 20,000. These are all out racing engines, no throttle to comromise air induction. You have one shot at getting the landing right, no go arounds, its sort of life or death. The more practice, the better at it you will become. Fortunately Jett does make a "Sports Jett" engine that is a higher rpm engine with excellent throttle response. The 50LX breaks in at 18,500 rpm or so, as does the 60LX. Yes, they cost twice as much as the OS 55. The nice part is they will still be running very well after you have purhased at least 2 and probably 3 or more OS engines. My little Jett 35 is still running strong going into 7 years of club racing, although relegated to backup this year. Yessssss, they are worth every penny in quality. My all time favorite to date is the 60LX, a 60 in a 40 frame that pulls a 8 to 9 pitch prop at around 20,000 and idle all day. Give one of these things a try, you will never go back .

I'll add to the suggestions for a Viper and OS .46FX combo. Good intro to speed, and a fairly docile design.

i`ll second lumcevevs thoughts above and add a jett muffler to the mix for another 1000 or so rpm. and yes the revolver is a quick plane. very slippery. somewhere in the revolver thread it was clocked at around 114 on a straight line. i have the same 75ax setup as well as a 91fxw/ a jett muffler. not as fast as the quickys or deltas, but a little easier to fly. i`m guessing the revolver w/ jett 60 or 90lx would get this plane in the 125 mph range. it is a well made plane and could probably handle the speed. i am suprised that this plane has not been talked about more in these threads. this plane really is slippery in the air. it is also a very nice looking plane.

if you want fun but, dont mind spending some cash, i just finished my sundowner 50 with a jett engineering 60lx. The plane with a sport prop (10x6) in level flight not off a dive is putting down 135 each pass. With a 9x9, it is 147. The catch is that the motors are near 400 bucks and there is a 4-5 week wait bc they make each engine after you order it. The plane is a lot of fun. 120 MPH knife edge flight is sweet!! just my opinion.

135MPH is impressive, can I get to that with OS75AX and Revolver if I get a tune pipe or something?

The Jetts do cost more but by the time you by another engine with a tuned pipe they aren't that much more.

Anyway, YES!. Get a tuned pipe! Also, a 13-10 is killing the motor. You want to get 16000-18000 from that motor. Try in the 8 to 9 in pitch range.

I have the OS75ax already on there, so only need tuned pipe.

So the prop part is where my ignorance comes in because I thought pitch is more relevant for speed?? anyways I moved down to 12x10 and now is in 12k range, not even close to 16k by a long shot, do i need larger smaller prop or pitch for speed??

Wow, the 75AX is not going to be anywhere near 18K, not that I have seen or read anyhow. Sorry man...I agree the 13/10 is WAY too big for that engine but it needs to be made clear that you will most likely not get similar performance to the Jett's. I would try a 12x8 or 12x9 apc on that engine.

The AX similarly to the Tower-75, generates it's HP at lower RPM's. You can get some impressive speed based on prop. selection but I would not spend the $ on a tuned pipe.

You might want to be careful pushing that revolver to hard as well. If it is not designed to handle heavy flight loads you could fold up the wing if you you get it too fast.
I agree with the Viper and .46 AX. I think that will be plenty fast for you to start with and plenty strong. I would just leave the revolver a sport plane.

Another suggestion is Magnum. Good looking plane that is plenty fast with any decent 40-50 size hot rod motor. I thought about getting Diamond Dust before getting the Magnum. I just don't like to fly planes that don't look like airplanes.

The 75AX likes to run around 13,000 rpm on the top limit.

Select a prop/pipe/exhaust setup that gets to that number and you will see pretty much its best performance. It is not a 16000+ rpm engine.

As for a speed choice.....
my turn-key easy speed setup......
GP Viper
TT 46-pro
Jett Muffler
9x7 or 8.75x8W prop
clip 5" off of each wing panel at the tip to cut the wingspan by 10".
Results: 130+ mph, very good handling plane, reasonable landing speed, no bad habits - not expensive.

regarding the revolver, razor is correct. a tuned pipe on this plane would be a mistake. to many extentions and the landing gear make it a pain to make work. i am sure some of the speed guys could make it work. ask dub jett if his turbo in cowl muffler would help out with the rpm. i had a t.w. 75 on my revolver till the bearings went out. i think the plane was a little faster with that engine. it is a little lighter than the 75ax. i have a 12x8 prop on my ax. with my other plane, i have the 91fx w/ the jett muffler and toni extention setup to clear the fuselage. i also installed the toni landing gear. i had to make some bends in the gear to make it work, but it was worth it. that is about as big an engine i would put on that plane.

75 ax w/ a 12x8 apc prop, pitts muffler and running fat i am geting 11800 rpm. also am useing 15% synth. fuel. the engine is still new.

I won't arue about the question of rpm but if you think adding a tuned muffler/pipe won't help then you have another thing coming.

i think what i said was a pipe on the revolver would not be a good choise.

I will try tomorrow with 12 x 8 prop and see how it goes.

Since someone mentioned the Sundowner, I was actually thinking about the Sundowner 1 as a more serious speed plane, but I heard some negative things about it....anyone have tried it?

PHall- A tuned pipe would be money and modifications with minimal results. It might be fun but I was trying to give the gentleman a realistic expectation. Were you?

Kiosk from what I head the little SD50 flys different that the bigger one. I have the little one and loves it.

http://www.jettengineering.com/sundowner.html the little sundowner is a sweet little plane..... its not unGodly fast, but its pretty sleek.

I was the one that radared a revolver @ 114, that was with an OS ax55. My revolver radared @ 120 with an os 61fsr. The 61 is too heavy for this plane IMO. I'm switching to a webra speed 50, plan on using a MAC'S ex long header and quiet pipe. If you want to go fast get an old quickie kit like a dominator or scatcat( one sold on ebay the other day for like $30) and an older quickie engine like a Webra Q40 or MVVS and you'll be doing over 150mph. That is with a JETT or Nelson race pipe of course

Take a look at: www.speedmodels.nl