Real world RPM

[DesertHucker]

	Quote: Originally Posted by Dan767
	DesertHucker: 14MZ!

Who you fly for? what rout? 3G reciever! I'm never getting on that airline

[Dan767]

No worries mate, it's just two pilots and a lot of boxes, and I usually don't fly the Honolulu-Sydney route!

[3d-aholic]

Brillelli B60, 366., 40:1 Pennzoil Air Cooled. 104 degrees F. Unknown humidity. Unknown Pressure. 2.5 Gallons, Sealevel +Austin TX, Stock Muffler/Exhaust.

7020 RPM. Xoar 23x8

[jharkin]

DA-50R, slimline pitts
87 octane 32:1 Penzoil
close to sea level, temps ~70-80

NX 22x8:
When new, just leaned in low end enough to transition ok
7150 peak
1950 ide

After 2 gallons, high needle untouched, low end tuned just right
7300 peak
1500-1550 idle

[rcign]

"Frankenmotor" Old 3W 85 twin made from used parts, Falkon ignition...
3W 26-10 prop, big can mufflers from a larger 3W, 6230 rpm....
The price was right

[sprice50]

	Quote: Originally Posted by rcign
	"Frankenmotor" Old 3W 85 twin made from used parts, Falkon ignition... 3W 26-10 prop, big can mufflers from a larger 3W, 6230 rpm.... The price was right

Sounds like pretty good performance for an older setup. Nice!

[BrunoMacedo]

Guys,

what are the typical or expected RPM of a DA 150 running on MTW 110 canisters and mejslick 32x10 ?

Thanks,

Bruno

[helivflyer]

DA-150 MTW cans, alltitude 4200', air temperature 67, Amsoil Saber 100:1, 91 octane Chevron fuel,Mezlik 30x12 6240 rpm on staight level flight with a engine temperature of 234, dropping to 6100 rpm on a vertical upline and with the engine temperature at 245. Diagnosed with a Pauly's R/C Products Temp-Tach.

[juanes1969]

3w-85xi, after 3 gallons spins a mejzlik 26x10 at 6800 rpms. Original muffler, 91 octane mixed at 40:1 with pennzoil. Unknown hummidity and unknown pressure. Temps at 90ºF.
Still vibrates a lot, but has incredible power.

[Stu_D]

Ok guys its new engine & plane time for me so here are the vitals for those who want to know .

Plane :- comp arf 3.0 yak

Engine :- 3W 170 classic NIB
Pipes :- 3W L90 ( the long ones )
Headers :- K & S stainless steel @ 275mm long

Run in test @ four hours on bench
Oil :- 33:1 castrol T2
Run in prop :-30 x 12 mej
RPM hot @ end of 4 hours :- 5300

1 st session -
Oil :-3W @ 50:1 , RPM 5300 with Mej 29 x 12 3 blade

2 nd session , RPM 5500 with Mej 32 x 10 2 blade

3 rd session , all same

4 th session , RPM 5950 with PT 32 x 10 2 blade

5th session , No tach start to rip Mej 32 x 10 2 blade , 7 hours total run @ this point

Up date on figures after 11 hours of air time and standard 3W headers (long drop)

Mej 29 x 12, 3 blade - 5850

PT 32 x 12 , 2 blade - 5850

Mej 32 x 10 , 2 blade - 6000

[pe reivers]

	Quote: Originally Posted by notorious_benny
	DA 100 on standard pipes with Menz 28-10 = 6100rpm. 95 octane, 50:1 castrol TTS. 35 degrees celsius, as good as at sea level. Question..... does a Mejlik spin faster or slower than a Menz on the same motor?? Anyone done back to back between the two prop brands???

Mejzlik spins faster, compared to Menz-S prop shapes.
Most wooden props impose a heavier load on the engine than carbon due to the design limitations in wood, which would make them too fragile.

[ultimate65]

Hi; Does any one have any RPM data on 3W 212 4 cylinder red heads ?

Thanks

[sprice50]

	Quote: Originally Posted by Stu_D
	Engine :- 3A 170 classic NIB Pipes :- 3W L90 ( the long ones ) Headers :- K & S stainless steel @ 275mm long Run in test @ four hours on bench

Isn't bench running a no-no for gassers? I heard it is a sure way to overheat the engines as they are never under full load at zero airspeed to extended periods in flight.

How did you do the bench run and ensure that it didn't cook?

[RTK]

You can bench run if you don't push them hard and only hit WOT in short bursts. One of 3W's break in procedures call for running at low rpm for 2-4 hours. I usually run mine on the plane/ground long enough to set the needles and make sure it will stay running, idle well, etc, then put it in the air.

[sprice50]

Thanks RTK. Makes sense. I'd follow your advice with respect to settling needles and then flying the break in nice and easy.