Real world RPM

[rdb127]

Area 51 By RC Extreme Power and JC Engines on stock side dump muffler.

5th tank of gas with 32-1 lawnboy, 15 foot ASL, 83 degrees and likely 90% humidity...been raining all morning.

Vess 23A gets 7000 on a hot engine.

YouTube - RC Extreme Power Area 51 engine

[2robinhood]

DL-100
Just started 5th gallon 40:1 Pennzoil aircooled.
Stock mufflers.
I live at 50" above sea level.
JFX 27 X 10 @ 6250rpm
Mejzlik 27 X 10 @ 6500 rpm

I am almost ready to start using a second DL-100 on a Hanger 9 Extra 260.

[pani]

DL 50 stock muffler
10 gallons through it
20 feet elevation
86 ambient
Amsoil professional 50:1 with 95 RON unleaded
Vess 22A 7440 rpm
Menz-S 22x8 7340 rpm
Menz-S 24x8 6660 rpm

[toti_ducati]

DL 50 maxima super m sythetic oil
thinner gasket ,clean up job on ports
2 gallons on engine

menz ultra 22x10 7600
menz 22x10 7400
menz 23x8 6800
vess 23 A 6600

[RTK]

G62 rcign lite
Mac's pipe
DA 25mm drop header
No tuning done, stock length on header--7550 Menz 23x8
85* 100 ASL

I have been told by the manufacturer of the pipe and others in the know that there is more to be had

[hexhome]

18 hours running. 30 - 1 mineral oil. 93 Octane fuel. NGK BPMR6F Plug (this made a very noticable improvement). 16X8 G-Sonic. 4.8v Ignition Battery.

Max 8250 Min 2100

I have recently stripped this engine to investigate some end float. This turned out to be movement of the rear bearing caused by electric starting. This could be easily shimmed out, but I chose to reseat the bearing (interference fit - heat the casing) and hand start in future. Now that I am confident at hand starting (big glove), all is well. I don't use choke as I can easily jam a thumb up the intake. As soon as fuel is evident in the intake, a couple of flicks starts it.

I was very impressed by the quality of castings and componants of this engine. I see no reason why it should not give years of service.

Best $170 ever spent!

[WrongWayRC]

DA-150 on KS rear exit Cans broken in (gallons unknown)
Amsoil at 50-1
82 degrees F
59% Humidity
15 foot ASL
Fuchs 29x12 Three Blade

5900 rpm cold 5800 rpm hot.

Can someone reccomend a 2 blade wood prop size for a similar configuration?

Pe what would be a good prop constant to assign this prop? BallparK?.

Thanks guys,

Richard

[pe reivers]

The Fuchs seem to have a wider tip than Mejzlik, so a wild guess would be ~1.7
I have no data on Fuchs props, so cannot be very sure. Just went by the picture at
http://www.cfk-fuchs.de/html/bilder2/27x10_3.jpg

[WrongWayRC]

Thanks Pe!! Anybody else running the 150 on KS with a two blade reccomendation. The plane is 41# and the style will be mostly freestyle with some IMAC and 3D mixed in.

[crash-n-burn]

DA 50-R
Ignition at 6.0 Volts
Es Composites Tuned pipe
MTW 25mm Drop header
Mezjlik 23x8 CF prop
Redline Racing oil 40:1 93 octane pump gas (broken in on 4 gallons 32:1 lawnboy)
465 feet above sea level

RPM 7000 all warmed up

[pe reivers]

What canister and/or pipe do you run? power seems to be in the pitts type muffler range
If a prop has less than half the diameter in pitch, it becomes less effective. Instead of choosing forrpm, you might try to load the engine and prop a bit more, like a 23x10 or 22x10 or even 22x12. he latter will give better spool-up, but needs lower idle for landing.

[RTK]

BME 58
Stock muffler supplied by BME
New, first run
70*
Menz-s 23x8
7200 rpm

[MalaysianFlyer]

MVVS 26cc IFS brand new out of the box
20:1 mix with the supplied oil
Bolly wood 18x6
3268 (35cc) pipe cut to 44cm length (muffler section also removed)
Custom header from Karl Mueller
8600rpm

[pe reivers]

Why run a 35cc pipe on the 26cc? The 3266 pipe is unsurpassed in power. Skorepa is equal, all others fall short.

[ROBNBAY]

Pe,
I am running an EVO 26GX with the Karl Mueller header and the 26cc tuned pipe from Horizon. Karl includes a small piece of pipe for tuning the engine. I have no experience with doing so. Can you help or point me to some information that might be of assistance.
Thanks,
Rob