Motor recommendation for Revell 1/48 Swift. - RC Groups
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Oct 09, 2017, 04:46 AM
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Motor recommendation for Revell 1/48 Swift.


Would a couple of F130s be able to put her up to plane or do I need something bigger ( brushed motor)?
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Oct 09, 2017, 10:47 AM
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boater_dave's Avatar
The 1:48 PCF Swift is a challenge to make operate due to it's very small hull. The real boats were capable of 20-something knots, so it should be fast enough to get the bow out of the water. I had good luck with small brushed motors from a foamie airplane. Swift 16 used super geared motors hacked from a helicopter (or plane, not sure). I think that 130 sized motors would be too heavy.
Check out the video of this Swift using brushless motors and a vee tail mixer.

Dave

Revell 1/48 PCF Swift Boat running in the rain ... (1 min 23 sec)
Oct 10, 2017, 08:11 PM
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Mabuchi 130 weigh around 17gm each so
2 would be 34gm.
Nov 18, 2017, 08:40 PM
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Was thinking of getting 2 of these and hooking them up in series. https://www.tamiyausa.com/items/mini...sh-motor-15318
Nov 20, 2017, 05:34 AM
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If I was doing one of these, or something of similar size and performance, I think I would need to start learning about brushless to get the power to weight wanted. I've seen a couple made operational, and they both had to compromise on weight making them sit deep - looked OK when running as they climbed out of the water, but lighter motors and batteries would have helped a lot.
Nov 20, 2017, 09:08 AM
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Ok. Thanks for advice.
Nov 20, 2017, 10:11 AM
Big Boats Rule!
boater_dave's Avatar
If the link was correct, 27,000 rpm on 3 volts? I would think that's too fast. And are you going to run on 1S?
This motor might be a better fit. And it's only 10 grams. I'd shoot for closer to 10,000 rpm at your battery voltage. In this case, 7400 @ 4.7 volts would be about 11,300 @ 7.2 volts (2S). A LiPo or LiFe is the only way to go, in my opinion. The Swift is much lighter than other boats of the same length, so it presents a weight challenge.
http://www.robotshop.com/en/solarbot...otor-rm1a.html


Dave
Nov 20, 2017, 08:44 PM
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Going over your Swift thread Cmpang said he was using 2 BL motors rated at 2900KV. So at 7.4 v they'll be at 21,460 rpm. The 27,000 rpm is without load. With load it goes down to 20,700 rpm.

I can look for motors with a lower rpm range. These Tamiya motor come in various rpm range. They just cost around $4 here compared to BL which cost 2-3x more.

I plan to hook 2 in series with a 7.4v lipo so each motor only gets 3.7v . Got the idea from a Japanese modeler.
3V用モーターを ラジコンに使う方法。 (2 min 55 sec)
Last edited by redboat219; Nov 21, 2017 at 07:28 AM.
Nov 21, 2017, 08:58 AM
Big Boats Rule!
boater_dave's Avatar
Be careful with that setup. Voltage divides according to resistance, and the resistance of a motor changes with load. If one motor get loaded down more than the other (friction, weeds, etc.), the other motor will get more voltage. If your motors are fragile, that may lead to problems.
My friend set up his Dauntless with motors wired in series. It worked very well, but those are Astro 40 Ferrite motors that are nearly bullet proof.
If you go for the 20K rpm motors, just keep an eye on prop cavitation.

Dave
Nov 23, 2017, 05:20 PM
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Ok. Ordered these instead https://www.tamiyausa.com/items/mini...-3-motor-95096
Last edited by redboat219; Nov 23, 2017 at 07:08 PM.
Dec 05, 2017, 07:57 PM
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Motors and kit have arrived.

Saw this nice conversion of a Revell 1/72 Vosper MTB. https://www.rcgroups.com/forums/show...-RC-convertion

Might take this route with my Swift boat.
( single centerline shaft/ drive motor only)

As these motors are only rated to 3V I plan to power the motor, steering servo, and Rx with a 4 AA pack.

As alternative I did order a couple of brushed 180 motors and 2 of those cheap brushed ESC (20A) online.
Last edited by redboat219; Dec 05, 2017 at 08:06 PM.
Dec 11, 2017, 12:31 PM
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what I saw when I opened the box!

Looks like it took a direct hit from a vietcong B40 rocket.


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