JCINTEXAS

Usually I fly S-L-O-W.
But every so often, I feel the need for speed.
I used to race Quickie 500.
This time around, I don't plan to go racing, but I do want a GO-FAST.
I want to get an engine from Dub Jett and put it on something that will go 140 plus.
I want to blast down the runway at 5 feet off the deck just below Mach One.
Whatever it is....it needs to be an ARF.
I invite your suggestions.
Regards
JC

evan-RCU

Why not a Quickee, they come in ARF...

MJD

My Feedback: (1)

Easy:

1. Buy an ARF Quickie, like a Viper or Predator.
2. Make the mods recommended for durability and sheer survival as recommended on here and on the Q500 forum.
3. Buy a Jett 60LX, break it in exactly as they say to, then bolt it on the Quickie with a suitable pylon prop as recommended by Jett.
4. You can do 3. at the same time as 1. & 2.
5. Go fly.

freakingfast

My Feedback: (3)

TIA

140 with a Jett 60LX? Really?

Wow that sounds cool!

Any problem balancing the cg with this motor and larger fuel tank combo?

freakingfast

My Feedback: (3)

[sm=biggrin.gif]

MJD

My Feedback: (1)

I think adding a weighted prop nut would merely reduce the time it takes to break the crank. The precession forces generated by the heavy brass nut at 20k+ rpm and 20g turns would be pretty cruel to the engine I think. I'd sooner get it as far forward as possible but mounted to the engine case or the mount.

MJD

HighPlains

My Feedback: (1)

If you need weight, just put a slug of lead wrapped in foam into the backplate recess.

freakingfast

My Feedback: (3)

The point of the post was missed. In order to eliminate confusion. DELETE.

Mike Connor

My Feedback: (5)

Is this post in the wrong thread? I do not see the above original quote here in this thread. It seems the concern was that it would be nose heavy because of the 60 engine and larger tank. Since the 60LX is a forty size case it would not be an issue. A Jett 8 oz tank may work will in a quickie if the 2" diameter isn't too big.

robert92679

Why so high up?? Gotta get it down low.

MJD

My Feedback: (1)

You got me there - there was a message there that had this in it.. really.. [sm=bananahead.gif]. Something about fixing the CG problem with a heavy prop nut.

WTHeck?

daven

My Feedback: (1)

A post was editied by the original poster and removed the content. I deleted the now empty posts to clean up the thread, although now it has a hole in it.

Not sure I would use an engine with a tuned pipe on a quickie, why don't you look at the sport Jett 40/46/50 with cast case and side exhause. All will get you to 140 mph with a quicke style airplane.

MJD

My Feedback: (1)

If the engine is to have other uses beyond all out top speed, then the Sport Jett .50 is perhaps a more versatile choice, as it is a perfect drop in for so many .40-.46 sized sport aircraft. But isn't the 60LX also available in SE to be used with the tuned mufflers? Now I forget..

Actually I have started work on a on old Doddger quickie kit, to which I am fitting a FIRE ST X .45 with tuned pipe and fiberglass engine/pipe cowling. For what purpose I am not sure, other than to give the engine a home and to do something fun.

MJD

Mike Connor

My Feedback: (5)

Yep

bob27s

My Feedback: (19)

Lots of good info here........

Viper ARF....
SJ-50 engine ...... if you want, up it to include the LX muffler.
8.8x8.5 prop
No issue hitting 140.

You will also see quite a few posts about the Weston Magnum. Fun little plane.
Same engine as above.
Only difference here is you have no landing gear.

David Hill

My Feedback: (2)

The Jett engine are great, but to be honest, pick up a used Nelson SS 428 motor, they are real cheap now and will last forever. I have bought a few and put the OS 61FX carb on it using a sleeve insert. It will ldle farelly well and boy does it go. I have one in a Vector and another in an old Prather Toni. I bought the carb and engines on Ebay for $160 total. It is almost 2 ounces lighter than the Jett 50. The Vector does over 150 and the Toni in the mid 140's. I had a Jett 50 in the Toni and it was almost 8 mph slower.


David

bob27s

My Feedback: (19)

Yep, used Q-500 engines are a good value. Just ensure you are getting a good engine and not one that has been abused.

Im not sure on that 2oz though. AAC and the short muffler might add up to close... not sure.

daven

My Feedback: (1)

I agree with Bob, some of the Jetts and Nelsons I've seen on the auction site I wouldn't touch.

I've sold 5 or 6 Nelsons there over the past year or so, and you use to get $225 for a good used motor, but now its down closer to $150. I've kept the few short strokes I have left and will sell them to any local that is interested in moving up to that racing class.

I use primarily Nelsons for racing, but love the sport jetts, and have them on all of my sport planes. Great idle, transition, and unload. Tough to beat. A 428 nelson will only be happy spinning over 19k, so I don't see it as a great option for most sport planes.

YUKONFLYR

8 or so years ago Performance Specialties sold Nelson Sport engines with a carb on it for sport use. Not sure if it was a basic quickee engine with a carb or not. Not available anymore!

I purchased a Nelson Q500 engine of the auction site. Prior to running it I pulled it apart and found the rod small end siezed to the piston pin. I replaced the pin for $8.00. On 10% the engine will spin almost 19000, I think it was 18600 and it is mostly worn out. Not much compression left compared to a new one. So I paid $150.00 plus the $8.00 for the pin. Not bad for a x racing motor that will now be used as a pylon trainer engine.

daven

My Feedback: (1)

For sport flying, even a worn nelson/jett will haul butt. The Short Strokes were unbelievably reliable motors considering the rpm and stress on the case/piston/crank/etc..

I had close to 200 flights on a Q40 motor and it was still competitive. I don't think we'll see that with the Long Strokes unfortunately.

The difference between a top of the line motor and an average one is only 5-10 mph. Means a lot over 2 1/2 mile course, but very little to a sport flier.

Nelson did have a sport version available, but I don't think many were sold. They were quite a bit more expensive than the Jetts at the time.

David Hill

My Feedback: (2)

Hi Guys,
Don't get me wrong, Jetts are great sport motors, I have several. All I was saying is the Nelson SS with an OS carb is a great go fast engine. It may not idle quite as low as a jett, but if you take out all of the liner shims and set the clearence to .012-.015 it has tons of torque and will unload even if you pull it down in the low 18 k on the ground.


David

russm

d.hill, your telling me you achieved 140+ mph w/ your toni-sj50 setup? what prop ?

David Hill

My Feedback: (2)

Hello,
No , maybe I did not say it clearly. With the Nelson it is in the mid 140's. The Jett 50 was 8mph lower, around 135 or so. The best prop I found for it were reworked Rev-Up 9x8 1/2 props. I cut them down to 8 3/4 reworking the blades a bit like we used to do for racing. The Bolly 9.25x7 CF is also a great prop.

David

russm

what is a pranther toni?