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03-04-2005, 01:08 AM | #1 |
RCC Junior Contributor
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Power system setup help needed
Hello,
I will be scratch building once spring arrives, until then I got time to do some research. But, electric sailplane is a huge territory, so many brands, and data to look at. My electric sailplane: 72 in span 395 sq.in area weight 18-21oz loading 6.6-7.7 oz/sq.ft MAX. prop size is 6x3 or 6x3.5..etc (6 inches basically)....folding prop. This model was originally designed for a simple brushed speed 400, with nicd 700mah cells. But from what I got from other builders of this, the climb rate is slow, meaning it would take like several minutes to get up to 500ft., I think they told me 20 degrees climb rate maybe. I am confused, people told me I have to watch amps, volts, rpm for 6x3 folding prop, etc etc. This is too much for my mind to handle all at once. Can you guys suggest a power system (brushless and lipo batts) which would give good climb rate? ---------------------------- Suggestions I got so far: -use 2-3 cell lipos in the 1200mah ---->I will be getting E-TEC1250HP -PJS 500 outrunners -----light, 50grams, but for larger direct drive props like 9 to 11 in, like $120. -PJS 400, is new and also expensive, but I might consider this if it offers good things, but designed for 6x3 props....over 2000 rmp, and 700g static thrust, but it will rip off the folding prop???? here is link: http://www.czpjsza-motory.cz/index_e.html -MP JET AC28/7-35D outrunner, for 7x3-10x4 APC props, but maybe it can handle 6x3, but is Kv950rpm/V which is low??, its light 56grams, and about $60, good price. -MEGA 16/15/4-is not outrunner, and heavy 76grams, and expensive, I ill not consider this. |
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03-15-2005, 02:37 AM | #3 | |
RCC Master Contributor
I am: a Scratch Builder
Join Date: Jun 2003
Location: Simcoe, Ontario
Radio of choice:
JR 9503 & DX7 # of RCs: 50+
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Posts: 1,321
Total Props: 6
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Quote:
The only thing I worry about brushless motors is if you can run such long motor or battery leads without causing damage to your esc. Here is a pic to give you an idea what it is. Chris
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03-15-2005, 06:11 AM | #4 |
Guest
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i might suggest one of the cd-rom kits parly becuase he could build a high rpm ,low torque motor that will at least run the prop at a higher rpm
although the esc problem worsens becuase the amps will go up castle creations 10 amp esc is very light ,place it mid way in the fuze??? j-coles |
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03-15-2005, 03:50 PM | #5 |
RCC Master Contributor
I am: a Scratch Builder
Join Date: Jun 2003
Location: Simcoe, Ontario
Radio of choice:
JR 9503 & DX7 # of RCs: 50+
Feedback: 0 / 0%
Posts: 1,321
Total Props: 6
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When I built mine I used the black speed 400 long can and 8 kan1050 nimh cells with the 6x3 folder. The motor can take more amperage than the regular 400.
I am still trying to solve a gliching problem and only have two flights on mine. Climb rate is not a problem. Chris
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