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Old Jan 10, 2014, 09:19 PM
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Data
Props

20x12 XOAR
22x8 Dynathrust
22x12 XOAR
22x14 Zinger
23x13 Turnigy
24x10 XOAR
24x13 Turnigy
26x13 APC e
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Old Jan 14, 2014, 06:18 PM
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???

Is this a list of props you have (for test purposes) or are selling or want to buy or test data or???

I ran your motor through motocalc (very slightly different version) and it came up very close to the AXI I used. I suggest trying a 24x 13 and see what your bench test numbers are. On 8S LiPos (assuming 6000 mAh+) it nearly matches my AXI on 8S3P A123 pack. This is calculated, my real world test results are in a note book at home. I will post them when I get a chance. I don't remember exactly but real world was a little faster but much less amps than Motocalc showed. If you do a bench test please post the results.

FYI a scale prop is 27.5" x 22", depending on engine.

Stephen
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Old Jan 14, 2014, 06:29 PM
Lori, hey, you're home early
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Stephen-- I should have noted that these are the props that I have. I made a list and posted it so I could refer to it and know what I had. The motor that I just got for the 1/4 scale BUSA D.VII is the Turnigy SK2 6374-168kv. It's a Hacker A60-16L clone. It's going to weigh right around 18 lbs AUW.
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Old Jan 14, 2014, 06:49 PM
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The motor I had entered info for had a KV of 170. Probably the same just a few months back. I assumed those were your props, just the post didn't go anywhere.

Was the D.VII built for electric from day 1? Mine was built for gas but I needed the weight of the battery brick for balance anyways. If you have to add nose weight might as well go for more battery.

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Old Jan 14, 2014, 07:29 PM
Lori, hey, you're home early
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Gas. The bare airframe with servos but no motor, lipos, esc or rx is just 14 lbs.

The SK3 6374 is a nice heavy lump of metal. It's 840gms, a little under 2 lbs. I'm looking at using 10s 5000's, possibly 2 sets of 10s for a total of 10,000mah if only for the weight,
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Old Jan 14, 2014, 07:30 PM
Lori, hey, you're home early
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What kind of RPM's were you seeing on the 24x13?
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Old Jan 14, 2014, 08:20 PM
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AXI 5345-16
8S3PA123s
Turnigy 24x15 wood gas
Phoenix HV85

24.5V
53A
4000 rpm

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Old Jan 14, 2014, 08:50 PM
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What are you running it in?
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Old Jan 14, 2014, 08:55 PM
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1/4 scale Fokker D.VII. All Up Weight between 24 and 25 pounds.

See my post on your "show your WWI planes" thread.
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Old Jan 14, 2014, 09:18 PM
Lori, hey, you're home early
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Right. Gorgeous model. That 4000 rpm is enough? I can probably go down to 8s then. I'll run the numbers in eCalc in a little while. It's not as sophisticated as Motocalc but it gets me pretty close. I suppose I should just download Motocalc.
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Old Jan 14, 2014, 09:31 PM
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Plenty for that beast. I have a Proctor kit and will try for under 20 lbs when I do. However, I have a Scorpion 5545-150 for that. It swings a 28" prop on 12S2PA123s.
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Old Jan 14, 2014, 10:17 PM
Lori, hey, you're home early
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That's very nice. I like a large slow prop on these things.
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Old Jan 15, 2014, 06:54 AM
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Even though scale is almost 28" the 24" prop looked fine. Getting enough pitch with these slower turning motors so you are not at or nearly full throttle all the time is an issue. With the pitches I have been using I am running over half throttle all the time. Lower pitch may require higher throttle and therefore less run time. Yes you have lots of thrust but you have to have pitch speed as well. I have a XOAR 26x16 electric which I will be trying in future looking for a happy medium.

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Old Jan 15, 2014, 09:38 AM
Lori, hey, you're home early
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At the WRAM Show last year there was a dealer selling really large props at great prices. If they're the this year I'm going to stock up on large diameter, big pitch props to test with the larger outrunner.
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Old Jan 15, 2014, 02:09 PM
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Who was it? Finding high pitch props is the hard part. Usually end at 10" pitch with the occasional 12".

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