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Thread OP
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Help needed: Hacker 50L 16 Turns.DS-51 3ph,Best controllers,cells for my F-14?
I have just decided on buying Hacker B50L's 16 winds,to fit into my DS-513ph fans.
Hacker Master 40-3P controllers,or Hacker Master 70-3P controllers? Can anyone advise on the best combination for use in my F-14 with cells.Would it be better to use one common pack of cells,or two seperate packs.Are CP1700's any use here,what will give most power and longest running times on how many cells. I am about to probably make a purchase from Gordon Tarling,so would like some very useful,but not overly complicated advice please. I want high speed preferably!  Matt. |
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Hacker B50L-16 have a kv=1509. On 20cells you'll probably see 750-800W so ~24cells sounds like a good max. Amp draw mid 40's is my guess.
Use two packs. 48 CP1700 vs 48 CP2400's is 23oz so weightgain might not alter too much but lighter is better handlingwise and you can always throttle down to gain flighttime. If speed is the big issue use the 2400's as the weight matter little in that respect. Controllers - no experience with the Jeti/Hacker's, am getting a kontronik (no surprise there  ) BEAT60-8-24 (60A cont. 8-24cells) for my own Schubi project. Kontronik also have a BEAT50-8-30 if higher cellcount is wanted. Price is €272 for either one.Good luck Matt - looking forward to see this one! The smaller one too!! |
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Bipeflyer:
FWIW use hackers ,with jeti 40-3p controllers 32x2400mah 16 per controller flying a 262 (14 + pounds) used to draw inexcess of 50 amps for the first min.......  Flew well, for 4 flights ,and on the fifth the smoke coming from the nacelle looked real cool But when the FLAMES started . great to have the correct equipment handy to put the fire out(Az.Jets)Changed the controllers to ones of of a higher current rating. ..  go with the dual power cells, easier to cool ,charge and a saving of time....Need 2 chargers any way because of cell countBugs Rule Joe |
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Matt,
You have been experiencing the same question I have been contemplating for my F-18. As I see it, it's a tradeoff between power, duration, and wing-loading. I am tempted to go with the higher wing loading, just to be able to have that insane power to be able to take a big jet like that verticle. I am still hemming and hawing over doing possibly a B50-10XL or a B50-15L. If I run alot of cells on the XL, like 48xCP1700, I can get 200 watts per pound, but my runtimes will be short, and my wing loading will be close to 50oz/sq. ft. But, man will it scream. There is a big thread on the discussion around it called "Optimal Hacker for Schreiner F-18" that you might get some ideas from. Or you could just do whatever Haldor says.... He seems to be an expert on the stuff, and I like how easy his math is to understand. I am planning on building a 123% one of your F-14's soon, so I will have the same problem. I have my plans now, but I haven't sat down and attempted to calculate the wing area of it. Also, my F-18 airframe weight without motor and batteries, is around 90oz. I imagine yours is much lighter. If you can post your weight and wing area, that would be really helpful. Then I could pump it into Motocalc and fiddle around with it myself. I am looking forward to your first flight so I can know what performance to expect, and it will help me with motor sizing on mine when I finally get it built. - Ted |
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Thread OP
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I want to use 2 x Hacker 50's 16 turns,in my F-14,with 2 x Hacker 70Amp controlllers,running 15 CP1700's a piece.
What kind of power/duration does that figure,anyone know? Ted,your'e right,my model appears to possess some extra area,and poss. lighter loading. I will ask James to figure it. Back later, Matt. |
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Matt,
This is B50L 16's you are planning on using? If so you'll find your answer here: http://www.schuebeler-jets.de/ Look under measurements and you will find a graph with this motor. It looks like you'll have to add a few cells to your setup. Arngeir |
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Thread OP
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HALDOR
Thanks Haldor,
What I plan to now do,is order a Hacker MASTER 77 - 3P OPTO for each motor,(B50L 16 winds) I checked them out,they are made by Jeti,in conjunction with Hacker. Gordon Whitehead passed this information to me. So with this set up,how many cells would you think I need with these controllers that can handle pretty high amperage,or should I keep with the 70A controllers,using how ever many cells? I'm not too worried about duration,(although would be nice!) I am not too electrically minded at the moment,so I hope you can bear with me!  Matt |
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Using Haldor's formula, of working backwards from the cell capacity, and run time....:-)
If I am correct, you should be using 48-50 cells total, or 24-25 cells per side with the Hacker B50-16L. This will give you roughly 1000 watts out per side, and should give you at least 3 minutes of static runtime on RC-2400 cells, or a bit over 2 minutes on the CP-1700 sized cells. In flight should be better, depending upon your wing area and the AUW of the plane. This also assumes you go full-throttle the whole time, which you probably won't need to. If you want to go with less cells you should use a 15L, or like Haldor is saying maybe an 11L or 12L if you are really sold on a 16 cell pack. - Ted |
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Thread OP
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Thanks Ted,
Ordered the above motors tonight.I'm gonna go with a model stuffed with cells-hang the expense,speed in jets is EVERYTHING! Like you say,with that area,I can always use my throttle stick for cruising inbetween the straight line vertical climbs! This machine is going to eat sky. Did you read my post on Modeling Science? Matt. |
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