Triton 3D

My Feedback: (1)

HI guys, i have a DA 50cc RPM question , whats the best RPM that i can get out of a NX 23x8 prop? im getting 6200rpm, but i havent leand it any more, what do you guys think?? should i close the High needle more??

Extreme3D

Is the engine broken in? If not, you need to put a smaller prop on it, (like a 22x8). If the motor is broken in, you should be somewhere around 6300-6500. Try not to overload the motor though, as some props flex more than others. If the motor isn't broken in, try a Mezjlk 22x8, and if its making massive power and is totally broken in, run a Mezjlik 24x8. My DA50 has just been switched to amsoil. I had a Zinger 22x8 on it, and was turning 6500 rpms. It should have been turning 6800-7000. I switched to a Mezjlik 22x8 and it started turning 6850-6900 rpms which was recommended. Hope this helps.

Matt

bodywerks

My Feedback: (4)

Also, and VERY importantly, what exhaust are you running? If it is a slimline or other pitts style muffler, count on a 2-300 rpm loss over a stock DA muffler. If it is a cannister and you have cut the header at all, it may be too short and also degrade performance. I had a Hyde pipe on my Yak with my DA, but had to cut 2.5" off the header to get it to fit in the fuse nicely. I, too, started out with a 23X8 MSC prop and was only able to get 6200 RPM out of it. Considering that I am at 7000 feet and that the engine was new, I thought I was loading the engine up. so I switched to a 22X10 menz. I got 6200 RPM out of that one, so I went to a 22X8...you guessed it, 6200 max RPM. For giggles, I took off the Hyde pipe and installed my stock muffler and immediately got 6700 RPM out of it and then 7000 with some fine tuning. The Hyde pipe was actually supposed to improve my R's over stock by 1-200 or so, but it's performance is based on a full length header, and cutting it short turned out to be a real no-no.
Long story short...if you are not running a stock muffler, try it. You need to be above 6500 R's for break-in and I don't know if a 23X8 will allow that, but it should turn at more than 6200...maybe 6400 or so.

Josey Wales

My Feedback: (61)

After 6 gallons Im running a Menz 22-8 at 7200 rpms with a Slimline pitts

Kevin Greene

My Feedback: (85)

Good grief!!! Those are some low #'s!! My DA-50 right out of the box with a Bennett muffler/Mejzlik 22X10 prop---7,000 to 7,200 RPM. I backed it off about 100 RPM.

My buddy's Brand spankin' new DA-50 with a Chip Hyde 22X8 prop, Chip Hyde header and quiet can muffler---7,600 RPM!!--Also backed this off about 100 RPM.

I guess some of these props really load the engine down---Kinda reminds me of the kind of #'s you get with a Dynathrust "boat paddle" prop vs a high performance/efficient prop. These DA's were made to breathe and run at higher RPM's than in the mid 6,000 RPM range.

Try one of Chip's new props---You will be pleasantly surprised by the performance---I haven't heard of a negative comment yet....[8D]

Kevin

bodywerks

My Feedback: (4)

My bad, Slimline is one of the only pitts style mufflers that isn't a major power robber, but bissons and the like are.
I have seen the Hyde props. The reason they spin so fast is because they are thin. I do like that they allow the engine to revv more, but I bet that if you attached a fish scale to the tail of the plane you'd get approximately the same static thrust with the Hyde prop verses, say, a menz or MSC of the same size.
Also, Kevin, if you are responding to my RPM figures, I must remind you that I am at 7000 feet ASL. Until you get a chance to fly up this high, you have no idea how lucky you are. You lose approximately 5% per every 1000 feet density altitude, so I must admit that I am lucky to be getting the RPM's out of mine at only 65% effective power. To give you an idea, my plane is 16 pounds, full of fuel, and I barely have unlimited vertical. I can hover, but powering out is not impressive.

Kevin Greene

My Feedback: (85)

No, I wasn't responding to your #'s at 7000 feet---I feel your pain!!! Do a search on Chip's props...Many have stated that their planes pulled out of a hover much faster and one guy even reported a change in how his flies in knife edge....Chip's props are extremely stiff and well made. That Brazilian hardwood that they are made from is VERY fibrous...Using the prop drill jig on my drill press I could very much tell the difference when drilling the four mounting holes vs other wood props. I know that I have MUCH better vertical performance now with my Double Vision than with other props that I've tried.

Kevin

Wings-RCU

My Feedback: (2)

Bodyworks, RPM actually goes up, not down with altitude. Your BHP drops but not your RPM. If your RPM is lower at a higher altitude it is because you failed to lean appropriately for the thinner air. As you know you will have less power but you should turn the same prop at a higher RPM due to the less dense air. At a higher altitude you may want to stay away from an 8 pitch prop and go 10 pitch or higher and make sure you lean the mixture appropriately.

jon595

My Feedback: (2)

Triton 3D,

I tried the NX 23x8 on my DA 50 (equipped with a Slimline muffler) and only saw about 6400 rpms max. It was too much load and would not really pull out like the NX 22x8. I switched back to the 22x8 and even though it would only run up to 6800, it had more than enough power. Temperature here is around 80-90 degrees with about 85% humidity (on average). The needle was not very sensitive with the 23x8. It got to a point were the more I opened it up, that it had no effect (I'm talking about 1/2 a turn). This is what made me believe that it was too much load (at least on the ground).

Good Luck,
Jon

Triton 3D

My Feedback: (1)

Hi, are you talking about pulling out of a hover? because i see that it dosent have enough power to get out of a hover, im using NX 23x8 and slimline pitts, would i have more pull whit the 22x8??

Triton 3D

My Feedback: (1)

and another thing, the temp. over here in PR is similar to yours..