Need some help with a conversion
I have a vintage Jemco P-47 that used to be glow. I am thinking of trying electric for the first time. Can anyone tell me what all exactly I will need to do this conversion? It is a 54" wingspan, .40-.60 size glow engine with retracts.
Thanks, ZM |
Get yourself "Eflite46" motor or similar, 80-100Amp/ESC and couple of 5 or 6S/4000/50C+mA batt, subj. to what size prop you like to spin, you'll be laughing!
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Originally Posted by Joseph Frost
(Post 12462859)
Get yourself "Eflite46" motor or similar, 80-100Amp/ESC and couple of 5 or 6S/4000/50C+mA batt, subj. to what size prop you like to spin, you'll be laughing!
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Know the prop clearance available and choose the correct motor with the proper KV for most efficient operation.
This is where buying a "one size fits all" such as the Eflight 46 may not be the best choice. Check with Lucien Miller at innov8tive designs for advice on a motor with the proper KV. Innov8tive Designs/Scorpion products |
Originally Posted by jollyroger
(Post 12549783)
Know the prop clearance available and choose the correct motor with the proper KV for most efficient operation.
This is where buying a "one size fits all" such as the Eflight 46 may not be the best choice. Check with Lucien Miller at innov8tive designs for advice on a motor with the proper KV. Innov8tive Designs/Scorpion products |
Originally Posted by Snoopy47
(Post 12461832)
... .40-.60 size glow engine with retracts. ...
Plane type and mass are leading when choosing power. See quote below. Planes don't care about voltage or Kv. They care about power though, bigly. Choice of voltage mainly depends an what you already have, and on what equipment is available. Below an excellent quote about motor selection. From brushless motors Kv?.
Originally Posted by scirocco
(Post 27290157)
While an absolutely critical part of the system ...
... Kv is actually the item one should choose last.
The reason I suggest picking Kv last, is that prop choices have bounds - the diameter that will physically fit and the minimum size that can absorb the power you want. On the other hand, combinations of voltage and Kv are much less constrained - at least before you purchase the components. So Kv is not a figure of merit, in that higher or lower is better, it is simply a motor characteristic that you exploit to make your power system do what you want, within the constraints you have, e.g. limited prop diameter, if it's a pusher configuration, or if you already have a bunch of 3S packs and don't want to buy more, and so on. Minor lay-out changes by RvS |
https://cimg1.ibsrv.net/gimg/www.rcu...f8ba238f23.jpg
46 still hanging on. Quote-Ignore engine<>motor cubic inches equivalencies, they restrict your choice of motors needlessly. Ignore shops that try to advice you that way, they don't know their business. Ignore people who never fly and don't know anything about flying! Best advice, visit your flying field and ask the for help from the ones that know what they are doing. |
Great info guys. Thank you. I will pursue my needs based on the info in post #6.
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1 Attachment(s)
Originally Posted by Snoopy47
(Post 12461832)
... .40-.60 size glow engine ...
Originally Posted by jollyroger
(Post 12549783)
... Check with Lucien Miller at innov8tive designs for advice on a motor with the proper Kv.
Innov8tive Designs/Scorpion products And there are also (garbage in, garbage out) e-flight calculators (compilation) - RCG E.g. eCalc, DriveCalc, ScorpionCalc c.s., MotoCalc.
Originally Posted by scirocco
(Post 12549885)
... Decide your peak power requirement based on the weight of the model and how you want to fly it. ...
Magic numbers for e-flight - WFF Note that Kv (in rpm/volt) says absolutely nothing about motor max.power, max.current, torque, efficiency. Kv only depends on desired rpm and battery voltage. It does effect current and power drawn greatly though, both are proportional to Kv cubed. More
Prettig weekend Attachment 2265215 Ron • Without a watt-meter you are in the dark ... until something starts to glow • • e-flight calculators • watt-meters • diy motor tips&tricks • Cumulus MFC • |
Visite castle website, they have a tool named ecalc, It can calculate all kinds of battery motor prop data for your choice, and the result is very good, I use them to calculate my 120cc electrical power system for my 2.6M slick 360, very good results.
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E-calculators, motor- and prop-databases, power systems theory (compilation)
e-flight calculators (compilation) (sticky) Contents
Prettig weekend ;) en wees voorzichtig, Ron • Without a watt-meter you're in the dark ... until something starts to glow • • E-flight calculators • watt-meters • diy motor tips&tricks • Cumulus MFC • |
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