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DL50 props and RPM

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Old 06-24-2007, 05:44 PM
  #1
2robinhood
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Default DL50 props and RPM

Lets keep this to:
What brand and size props.
Stock muffler or not.
How many gallons of fuel through the motor.
What brand and ratio of oil.
What's you RPM is.
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Old 06-24-2007, 07:45 PM
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Default RE: DL50 props and RPM

What about air temp and humidity?

I was running

xoar 22x8
lawn boy ashless 32:1
1 gal through motor
40deg F 20% humidity
7400 rpm not tuned to peak.
Stock muffler
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Old 06-24-2007, 08:06 PM
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Default RE: DL50 props and RPM

23-8 Xoar
Stock
1/4
Pennz
6700
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Old 06-24-2007, 09:19 PM
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Default RE: DL50 props and RPM

.
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Old 06-24-2007, 09:49 PM
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Default RE: DL50 props and RPM

Heavens to Betsy--------
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Old 06-24-2007, 10:24 PM
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Old 06-24-2007, 11:06 PM
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Default RE: DL50 props and RPM

Owch!
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Old 06-24-2007, 11:44 PM
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Default RE: DL50 props and RPM

Hi,

I have two DL's

General conditions:

Temperature: between 30 and 40C (86-100F)
Humidity: below 40%
Altitude: 1350 feet


Engine 1:

22x8 Menz
KS cannister
32:1 mineral
5 gallons
7400 rpm


Engine 2:
22x8 JXF
Stock exhaust
25:1 mineral
1 gallon
6800 rpm

Two observations: The JXF prop did not impress so much (besides the big unbalance). Also the first engine did not turn more than 7000 with JXF and stock exhaust. Seems that the JXF is pulling down rpm but does not convert that into thrust as with the Menz the pulling power is seriously better.

With the cannister the engine is running better throughout the whole rpm range. Transition and partial throttle is much smoother


Ro
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Old 06-24-2007, 11:56 PM
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Default RE: DL50 props and RPM

Maybe you got a bad batch of JFX prop, I'm getting 7000RPM with a JFX 23x8. My JFX prop was almost perfectly balance.

Stock muffler
32:1 mineral oil
1.5 gallon
7000 rpm

Temp:60F
Alt:1800ft
Hum: 30%
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Old 06-25-2007, 05:47 AM
  #10
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Default RE: DL50 props and RPM

NUMBERS ONLY CAN'T YOU READ!
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Old 06-25-2007, 09:20 AM
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Default RE: DL50 props and RPM

All numbers on a Slimline Pitts muffler.
660 Feet ASL (Markham, Ontario)

All numbers were without adjusting the needles after pulling it out of the box.

First run ever - Revolution 22 x 8, 7000 RPM
This prop picked up 350 more RPM after 5 ten minute runs.

Run #6 was with a PT model 23 x 8, 6700 RPM (probably needed to tweak the needles for this bigger prop...changed it after 1 flight)

Run #7 through #8 with NX 22 x 8. 7100 RPM. This, in my opinion gave the best performance of the three props.

The motor is still picking up power after 9 flights.
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Old 06-25-2007, 10:26 AM
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Default RE: DL50 props and RPM

you do need to set the needles, or your rpm will be way too low.
[link=http://www.prme.nl/forum/viewtopic.php?t=10]Here is how.[/link]
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Old 06-25-2007, 01:07 PM
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Default RE: DL50 props and RPM

What brand and size prop: TBM 23x8
Stock muffler
How many gallons of fuel through the motor: 2 Gallons
What brand and ratio of oil: Klotz 32:1
What's you RPM: 6900

http://www.youtube.com/watch?v=oD1TnxNjO_g
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Old 06-25-2007, 01:13 PM
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Default RE: DL50 props and RPM

I just bought one of these. I know it looks like a DA-50 (which I don't own) but was wondering how it compares performance wise. It sure is good looking.

Bob
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Old 07-03-2007, 10:21 PM
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Default RE: DL50 props and RPM

Brand new motor.
48 oz of fuel through it.
Lawnboy ashless 32:1
Stock muffler
JFX 22 X 8
6850rpm
Has been running better with each tank of fuel, only ran it up to take rpm reading.
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Old 07-04-2007, 08:25 PM
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Default RE: DL50 props and RPM

JXF 22x8
Poulan Chainsaw/wead eater oil @ 40:1
16-20 ounces of fuel burned
stock muffler
6700-6800 not peaked, just adjusted so it would idle and run up pretty clean.

I had to lean it way down after the first flight, have not tached it since then. I know what I need to know, it's PLENTY of engine for a 14# plane, almost too much, but it's fun [8D]

I have a PT carbon 22x8 and a JXF 22x10, but I probably won't tach them unless there is a need to put them on. I'm very happy with the 22x8, until it gets broken I will probably stick with it.

My ignition appears to use 150-175 mah per 10 minute flight.
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Old 07-05-2007, 06:53 PM
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Default RE: DL50 props and RPM


Quote:
ORIGINAL: Meesh

I just bought one of these. I know it looks like a DA-50 (which I don't own) but was wondering how it compares performance wise. It sure is good looking.

Bob
From what I have read, a good running DL-50 will out pull a good running DA-50 by approx. 100 RPM, with better midrange transition.

Also the DL appears to be 50.8cc vs 50cc for the DA, if the specs I read are correct. I guess the extra displacement is where the 100 rpm comes from.

Someone correct me if I'm wrong.

Scott Gaines
DL-50 #166
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Old 07-05-2007, 08:17 PM
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Default RE: DL50 props and RPM

Just a thought. I see lots of RPM readings being thrown around in this forum. Has anyone ever thought to ask what the +or- error of most tachs are? IE 7800 +or- what %. All of the digital tachs I've seen vary quite a bit in a normal day of use, at least on the order of + or - a coupe tenths of a percent or so. The best tach I have is an old Royal analog protach and I wouldn't expect it to be accurate within a hundred rpm. I find the digital type tach to jump around quite a bit compared to the analog type. Heck I even have an old Fram reed type tach that I think may be as accurate as anything in common use. I know that Clarence Lee or maybe it was Peter Chin would use direct drive tachs when they were writing articles for the magazines because they were more consistent.

Larry
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Old 07-06-2007, 01:21 AM
  #19
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Default RE: DL50 props and RPM

My Hyperion E-meter is as accurate as my electricity board.
It shows 3000 rpm in the house, with the ceiling lamp on, indicating 50 Hz alternating currency frequency.
I assume that the electricity board has got their stuff right, so the rev. counter is OK as well.
If the rev. counter had shown more or less than 3000, then it would have been out of calibration.
(Obviously 3600 rpm for those of you with 60 Hz mains supply.)
Easy check.

Magne
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Old 07-06-2007, 02:46 AM
  #20
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Default RE: DL50 props and RPM

about this new generation of chinese engines
may i ask has anyone compared the 3mmtoc53 vs dl50
what say youabout them
thx
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Old 07-06-2007, 10:28 PM
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Old 07-07-2007, 09:34 AM
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Default RE: DL50 props and RPM

I'm thinking of buying a DL just to try out. I have a 3MM 53 in a WH Edge540T V2 and it turns 6800 with a Vess 22A on 32:1 ashless and gets better every run. 25 pounds of static thrust. Less then 1/2 gallon of fuel through it. Running stock muffler until it came apart. There are Bisson and tuned pipes available for it now though through Wild Hare.
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Old 07-09-2007, 08:57 PM
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Default RE: DL50 props and RPM

Where Can I Buy The DL50 Here In The USA

Thanks
STEVE
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Old 07-09-2007, 09:11 PM
  #24
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Default RE: DL50 props and RPM

Come on....Higher, higher, higher.

Someone in the DL 50 thread is getting 7700 with a 23x8....
You guys must not be doing something right.....
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Old 07-11-2007, 03:10 AM
  #25
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Default RE: DL50 props and RPM

Looks like DL is waaaay stronger than 3MM
7700 !!!! that rivals mvvs58 and lighter in wt too
thx
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