Put WOOD as far from your mind as possible...you have entered the world of High Performance....carbon, glass, and nylon!

Originally Posted by mikes68charger

Ok thanks. It turns out my tac is only good to 32,000rpm. So I gess my numbers may be higher

I'm going to order more props today. I found a wood topflite 7x6 prop but can't find info on rpm. Lol

Don't even THINK about any prop that says ELECTRIC on it, or is wood construction.

Electric props are designed for park flyers and 3D planes.

Even though, yes, we are running electric systems, the Electric props from any manufacturer are designed for lower power levels.
This means lower RPM limits for one thing. So they can turn faster before physical failure.
BUT it also means their airfoils do better at lower RPM. Once you get the prop's tips going 0.8-0.9 Mach, the props designed for nitro use will produce better airspeeds for less watts than a similar sized Electric prop. This has been tested and confirmed on more than one airframe by more than one person.

So APC's Sport line of props is good.
7x6, 7x7, 7x8, 7x9, 7x10 SPORT are all suited to high power flight.
APC Q40 7.4" diameter props also run high power very well.
And then, of course, the high quality custom props by the likes of Markus Koch are suited to the high power levels we're looking at.

Well guys I got some more numbers

ARC 36-75-1 
73 amps. 15,400 rpm  8.75x.7.5
On 3200 40c 3s

95amps 17,300 -17,000rpm 8.75x7.5. About 6.5 pounds thrust 127mph. 
on 2600 4s 40c

6x4 pylon

18,900 rpm 17 amps
23,600 rpm 25amps 4s
31,500rpm. 48amps 6s 2200 30c and about 4.4 pounds thrust
121mph (ARC 28-58-1) turns same rpm at 105amps 4s

7s 2200 30c      37,000rpm 140mph  5.8pounds. 

7x7 aero-naut carbon prop
4s.  52amps 17,000 rpms

5s 3400 40c   84amps. 21,000rpm  at 3.85volts a cell 140mph

92amps 21,800rpm peak  145mph 
 But only 3.8 pounds of thrust

6s.  105+ amps 2200 40c  23,400rpm  I'm sure there's more with no meter. But the amp draw is just to high for this pack.  4 pounds thrust 152mph

Anyone know if this 7x7 loads like the 7x8, 7x9 or 7x10 apc sport props?

As this is a 69in Speed Flacon that I want to run like a big ploylon thrust is almost important than pich speed.

It looks like I should try the little 6x5 or 6x6 props. Amps are lower but if I keep rpm up thrust seem almost better

With the data above what prop you think is best?

Originally Posted by arcticflyer

Put WOOD as far from your mind as possible...you have entered the world of High Performance....carbon, glass, and nylon!

How long do you think they ran wood props in Q40 and Quickie? Decades? Those props had to endure the same RPM that the nylon pylon props APC sells today do, and they did it fine.

A quality wood prop is nothing to turn your nose up at. One of the bigger downsides was a lack of consistency, bag-to-bag. Strength wasn't the reason why most competitors transitioned to Nylon.

Glad you joined the party Kid...however I must respectfully disagree. They were not turning the RPM's we are talking about turning here (25,000 to 30,000). I wouldn't go near a field where I thought a guy was spinning up a wood prop at 30,000. Please don't take offense...that's just me Bro.

Well I take the lack of answers to tell me what I already should know.

This ARC is great in EDF but not so with prop sure it will spin a little prop up high but not the 8in or so prop range Im looking for.

Im going to sell it and get one of these.

http://www.espritmodel.com/mvvs-46-5...ess-motor.aspx
MVVS 46 5.6/960 Redline Sport Sailplane Brushless Motor

Not the badest boy on the block but I think a good starting point With a 11X10 on 4 or 5s will be the ticket for now.

Mike

YEEEEEEE HAAAAAAA...the beasty arrived today! So did the Spektrum 9300. The Monster will be chewin up the air before long now

Won't be able to fly tomorrow as I am having some CNC control horns custom made by a freind who works on full scale helis. But I might be able to get some prop tests done.

Man am I pumped

Would be really sweet to get some static test data ,,, and some motor temps(just by the touch)..

Sebbe..

Here are some initial numbers with the Typhoon/Ice Lite 200 ESC:

4S - To minimal to even consider (got them if someone wants them).

5S: Volts - 18.9 avg
Amps- 74.9 max
Watts- 1339 max
RPM's- 20,215
Motor Temp after static test- 103.5F
PROP - APC 7x9 Sport

6S Volts- 22.3 avg
Amps- 91.5 max
Watts- 1869
RPM's- 22,736
Motor Temp after static test- 107F
PROP- APC 7x9 Sport

5S Volts- 18.4 avg
Amps- 108.2 max
Watts- 1789 max
RPM's- 16,957 max
PROP - M. Koch 7x13 folders.
Motor Temp after static test- 151F

6S I am working on getting batteries from 6S to 8S. I made a 6S with two 3S 2200's in series but the ESC cut out at two thirds throttle with the 7x13's. Cruddy way to do it and I knew it ahead of time but still tried. Will have more numbers this week.

Interesting numbers,

Heres some numbers I got off a scorpion 3026-1400 on 5S with the 7x9

APC 7x9 Sport

22388 RPM
17.86V
106A
1966W
191 Mph Pitch speed

So for the same watts as 6S on the HET the rpms are damn similar.

Interesting Jacko - This is the kinda stuff I wanted to see..

I'll be getting a good 6S pack tomorrow from a friend so I can get the numbers on that 7x13.

I wish Scorpion would put a GS (Hyperion) nose on the front of some of that line of outrunners...no question I would use them!

HERE ARE SOME 6S numbers: (Typhoon 650-68-1340)

Volts- 21.4 avg
Amps- 139.8 max
Watts-2646 max
RPMs- 19,045
PROP - M.Koch 7x13 folders.

Well this beast is ready for maiden tomorrow night. Used three antennas and did range testing last night with no holds on the Flight Log.

good luck arctic, that is really a beast now...

Compared to the F5D planes you got alot of power in there, still there are room for alot more juice

Good to have one of these up flying soon, it will provide alot of good data for future projects.