Real world RPM

[jamesrxx951]

stiffy, how do you like that prop. i had a mej 22/8 and liked it alot but put on a menz 23/8 and liked it better. thought of trying the mej 22/10. whats your opinion of the prop.

[rcign]

Brannd new but old style Quadra 50 converted to RC EXL...Vess 22-8, 6600 using a Milton Thompson G26 muffler held on with 1 bolt, the pattern is not the same....
Maybe Tom Sabatini, Q52 maker, should look into this combo.......The 52 is stronger than the 50....

[Al Lewis]

	Quote: Originally Posted by stiffy
	guys, this prop maybe really mislabled. the actual pitch is 8in I think (22x8 @ 7500rpm draw 14kg thrust is typical)

May not be as my DL-50 spins a Vess 23A at 7400. The 55 is stronger. Also it's very difficult to get a accurate thrust reading like that. I tried. LOL

[jamesrxx951]

	Quote: Originally Posted by Al Lewis
	May not be as my DL-50 spins a Vess 23A at 7400. The 55 is stronger. Also it's very difficult to get a accurate thrust reading like that. I tried. LOL

my dle55 spins that prop same rpms through a canister exhaust. would be better with stock exhaust or even better with a tuned pipe.

[Wayne's World]

DL55 spinning vess 23a 7460 on stock muffler 22x8 zoar spins 7600 stock muffler also. i can really tell the difference between my DL50 and The 55

[runnjarn]

Hi, relatively new to this forum.
Can someone explain the focus on (high) rpm's? (exept that it is the thread headline)
Isn't it a high level of thrust at a relatively low rpm that is what to look for??
If there is a thread about that, please direct me.

Thank you

[closetguy]

I can't speak for the rest of the guy's here, but I like to compare what other people are getting in the way of RPM's with the same prop and engine that i have.Also it weeds out the under powered engines so i don't waste my money on a dog.

[pe reivers]

	Quote: Originally Posted by runnjarn
	Hi, relatively new to this forum. Can someone explain the focus on (high) rpm's? (exept that it is the thread headline) Isn't it a high level of thrust at a relatively low rpm that is what to look for?? If there is a thread about that, please direct me. Thank you

Americans are very fond of rpm and You are right, it is thrust that moves a plane.
Having said that, rpm combined with propeller data provides very valuable information for cross-comparison of engines and engine-muffler systems, so this thread is of great value.

[kickerfx4]

	Quote: Originally Posted by rcign
	DL50 Xoar 23-8 Stock muffler 6700 rpm Altitude 6800, 32-1 oil, 87 octane gas

Ditto...Exact results here

[WrongWayRC]

DL-30, 3 gallons of YamaLube break in and now royal purple at 50-1.

70 degrees, 20 foot above sea level, stock muffler, regular gas,

JC Super Prop 20x7 gives 7000 rpm.

[dogshome]

CRRC Pro GF40i kit engine.

8,000 RPM
Graupner G-Sonic 18*8
32:1 trimmer oil
Standard muffler
10C
100ft
10 minutes running.


(20 foot above sea level LOL. Don't get your feet wet!)

[toti_ducati]

BME 116 Vess 27 B after 3 tanks of ground run, after 2 tanks of flying from cold its a 6900RPM
after a few seconds it goes down to 6500 when warm
is this normal?
pulls my extreme flight 35% yak 54 easily, floats a lot better now

[Super08]

Yes it is normal, they turn lower rpm once heat soaked.

[RTK]

You should get some drop, but with that engine I usually don't see that much. It might be getting a little warm. Try richening up the high a tad and see if the drop is not a large or low. Also be sure you have adequate air flow and some sort of baffling with good extraction.

[LanceLKs]

	Quote: Originally Posted by toti_ducati
	BME 116 Vess 27 B after 3 tanks of ground run, after 2 tanks of flying from cold its a 6900RPM after a few seconds it goes down to 6500 when warm is this normal? pulls my extreme flight 35% yak 54 easily, floats a lot better now

You should never run these engines that much on the ground. Get the needles adjusted correctly and fly them. They cant get enough air to cool them when they are run on the ground.