[PSUBS-MAILIST] Brushless thruster test

[hank pronk via Personal_Submersibles]

Alan,That motor looks pretty nice!  I still think rpm is your enemy, seal wise.Hank 

    On Saturday, January 30, 2016 9:20 AM, T Novak via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 #yiv6297382217 #yiv6297382217 -- _filtered #yiv6297382217 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv6297382217 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv6297382217 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv6297382217 #yiv6297382217 p.yiv6297382217MsoNormal, #yiv6297382217 li.yiv6297382217MsoNormal, #yiv6297382217 div.yiv6297382217MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}#yiv6297382217 a:link, #yiv6297382217 span.yiv6297382217MsoHyperlink {color:blue;text-decoration:underline;}#yiv6297382217 a:visited, #yiv6297382217 span.yiv6297382217MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv6297382217 span.yiv6297382217EmailStyle17 {color:#1F497D;}#yiv6297382217 .yiv6297382217MsoChpDefault {font-size:10.0pt;} _filtered #yiv6297382217 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv6297382217 div.yiv6297382217WordSection1 {}#yiv6297382217 Thanks for the update, Alan.It looks like your research is coming along quite well.Tim  From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Saturday, January 30, 2016 1:47 AM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: [PSUBS-MAILIST] Brushless thruster test  I had an initial pool test of my brushless thruster yesterday.Thruster is on projects page http://www.psubs.org/projects/1235435392/brushlessthruster/A bit of a mixed bag. Firstly I was testing it on 36-37 V & not 44 that it was designed for,due to size restrictions on import of Lithium polymer batteries. I will buy the additional voltage.   I was getting 5kg (11lb) thrust off 150W & 10kg (22lb) off 515W, which is comparable &better than some commercial direct drive BLDC thrusters that I have specs on.However I got to 13kg thrust & the propeller seemed to slip at that point & even though it was running at 2,200W I wasn't getting any more thrust. I was only a couple of feet out from the pool edge when testing, so that could be contributing.Another factor could have been that the seal leaked badly & the motor was short circuiting through the water. Why did the seal leak? Possibly I damaged it hammering it in to it's housingor because I didn't polish up the propeller shaft. I have other motors I will be testing, so a lot more work & learning to do on this one.I did notice I had the same problem as  Cliff, with the motor wiring starting to wear throughwhere it comes out of the housing.Cheers Alan
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