Goldberg Tiger 2 Conversion
I have a Goldberg Tiger 2 40 powered by an OS 46 Max AX glow engine that I want to convert to electric.
I was looking on YouTube and someone had a Tiger 3 that they were recommending a brushless motor 1000-1400 watt. I was all set to buy a Turnigy Aerodrive SK3 4250 motor with a 1350 watt output, 500 kv, when a flying club member told me that this motor is more for 60 size aircraft. He recommended a Turnigy Aerodrive SK3 3548 840kv motor. I would like to get another opinion before purchasing a motor. What do you think for this conversion? Which of the above motors would you use? Thanks, Terry |
Forget all the nonsense about can sizes and kv. Go to Hobbypartz.com and buy a Talon Bigfoot 46. IT'S A 46 SIZE MOTOR. Any time you are doing a conversion and the manufacturer, not some jaywhacko on youtube, doesn't tell you what size electric to use always get a Bigfoot equivalent. In fact, get one even if the manufacturer gives you the info. They are great motors and cheap.
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Welcome to the witch craft of E power. I have 3 of the Tacon .46's, I also have the .10, .15, .25, .60, all work very very well. I run a 12x6, 12x7, 12x8, 13x6, 13x7 props with a 5s battery. Not sure how much ground clearance you have on the Tiger? 11x7, 10x8 3 bladed prop might fit, but would need to use a watt meter to make sure you are not pulling to many amps. If all else fails, just build taller landing gear. New nose wheel would be around 8 bucks, some piano wire 3 bucks?
Here is a nice online motor calc program. The free version the Tacon is greyed out so I could not try the 11x8 3 bladed prop. I let my script expire. https://ecalc.ch/motorcalc.php Buzz. |
Below an excellent quote about motor selection.
Better forget glow engine equivalences, too restrictve. Only for lazy sellers. 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.
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 • 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 • |
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