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  1. Aeroplayin

    12S power systems ideas and options

    And this is what it looks like when I'm done with it....
  2. Aeroplayin

    12S power systems ideas and options

    No, that's my analysis of the log output. The CSV file looks something like this:
  3. Aeroplayin

    12S power systems ideas and options

    Also keep in mind that I calculate HP from Watts-out, not Watts-in. Unlike a gas engine, we will have a margin between the Watts the meter shows us at the source, and what power makes it to the prop shaft after part of the power is used in heat, magnetic fields, and a few more minor items. For...
  4. Aeroplayin

    12S power systems ideas and options

    BTW -- Red highlighted Amps are high, not low.
  5. Aeroplayin

    12S power systems ideas and options

    I have been fortunate enough to be involved with a group of really great guys that have contributed a great deal to our understanding of motor and prop production. Bryan is certainly one at the top of the list. Last week, I mailed out a box of props that we are testing, and they arrived in MI...
  6. Aeroplayin

    12S power systems ideas and options

    FYI -- for those that don't know me as well as Gary, I'm a BIG Subsonic/Motrolfly fan and have owned nine Motrolfly motors. I actually sold my two Q80 motors and if this ZTW, DM5335-192, Xion 24x9 CF prop is going to spin 7400 RPMs on two decent 6S batteries, on only 135A, I'm in.
  7. Aeroplayin

    12S power systems ideas and options

    That could be worse, actually. Although the prop is stiffer, it has less pitch, which means less power at the same RPMs. From what I've seen from experience, less pitch may calculate to needing more RPMs unless the area of the blade is bigger, like with a wide prop, but the added mass may make...
  8. Aeroplayin

    12S power systems ideas and options

    Here are some things to consider when hearing Watts measurements. Unless a lot of the 6000 Watts is going to heat, magnetic field, noise, light, etc, and the motor is instead operating a high efficiency as all Motrolfly motors do, then even at 83% efficiency, 6000 Watts-in is about 5175...
  9. Aeroplayin

    12S power systems ideas and options

    You'll have to give me RPMs because I've not seen any data where batteries help 4.15v per cell under load after a little while at WOT in any of the testing we've done over the last three years. The key is RPMs and prop specs because regardless of what the different meters and logging software...
  10. Aeroplayin

    12S power systems ideas and options

    That must be a round-up peak reading, right? Averaging a 20 second block of readings off the Castle logger after the first 5 seconds of WOT were burned off in static testing, we're seeing between 5112W and 5137W to between 6847 and 6877 RPMs with the 24x10 PJN, and between 5236W and 5351W to...
  11. Aeroplayin

    The EXTRA 300 EXT Build Thread

    Sorry, I didn't even know what plane this thread was about, but I got an email telling me I was mentioned, so I came to see what that was about yesterday. Nice feature, actually. But just to clarify a few things before going back to Extreme Flight and 3DHS threads.... 6S is fine for most guys...
  12. Aeroplayin

    The EXTRA 300 EXT Build Thread

    I didn't have time to read through everything and I certainly like to do that so that I'm not covering the same ground twice, but what I don't see are numbers, and numbers tell the story. Here’s a real example since I see the DM4325 mentioned: I have an A60-7S 215Kv motor that I had set up on...
  13. Aeroplayin

    Extreme Flight Owners Thread

    Those two flights just happened to be with a 6S 40C 3300 Sky Lipo. Frank also has Glaciers and they seem to be just as good. Tom likes Sky's and we used to buy them exclusively, but it's tough to find them in stock all the time. He has some 5S 40C 5200 Revolectrix on his 78 Extra too, and all...
  14. Aeroplayin

    Extreme Flight Owners Thread

    64 MXS with the 4315-480 with the 16x8 PJN and a Talon 90. Most of you have seen this already but this was Tom's first and second flight on the MXS and Frankjp always has nerves of steel to let Tom fly his planes. If you can wait for the second flight, he really thrashes it. I was happy when...
  15. Aeroplayin

    Extreme Flight Owners Thread

    Thanks, but as you know, a lot of guys helped verify these calculations and you contributed too, and hopefully will continue when the weather breaks. Also, Pe was instrumental in feeding me aspects of prop physics and I think he would have enjoyed where things have lead.
  16. Aeroplayin

    Extreme Flight Owners Thread

    19x8 85g prop at 2600 ft ASL and 40 degrees with a 30% humidity at 8000 RPMs will develop 2.8 HP and 19.6 pounds of thrust. A 20x7 at about 90g at the same 8000 RPMs will do 3.0 HP and 20.7 pounds, and at 8500, will do 3.6 HP and 24.87 pounds of thrust. Move the altitude down to Wellington...
  17. Aeroplayin

    Extreme Flight Owners Thread

    Pe and I conversed a lot about this when I was building the PropEngine. The pK was always the issue, and the main point of our discussions. In his very last post on another forum, he suggested two formulas to me because he always had issues with prop load constants, and these formulas dealt...
  18. Aeroplayin

    Extreme Flight Owners Thread

    Who am I kidding... I'll take anything they offer in this size.
  19. Aeroplayin

    Extreme Flight Owners Thread

    May not be an Edge, but who cares? I love Lasers but don't own an EF Laser in any size yet, so a 70-75 Laser would mean an instant buy for me.
  20. Aeroplayin

    Extreme Flight Owners Thread

    I said the same thing on 'another' thread and Chris came back with "be careful what you wish for". Stay tuned.
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