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Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Nov 30 2014 10:57am
by Overclocker
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The Mongoose Salvo (size L) was chosen because 1) good price, 2) huge triangle

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The GNG in my hotel room in Hong Kong after meeting up with Jon Chan's dad. Very nice guy, he even took me to a hilltop with a good view :D

Unfortunately in stock form it's probably a belt shredder so I decided to tweak the design a bit. I also got Lightningrod's upper sheets:

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Anti seize on parts that I'll probably have to disassemble later on

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12s8p samsung ICR18650-26F bonded together in groups of 8.

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test fitting...

in progress... suggestions/wisdom most welcome

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Dec 22 2014 6:56am
by Overclocker
sorry for the very slow progress...

pre-fluxed:
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Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Jan 11 2015 9:53am
by Wheazel
Looks good! Are those copperwires cell-level fuses?
What kind of flux do you use?

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Jan 17 2015 10:14am
by Overclocker
Wheazel wrote:Looks good! Are those copperwires cell-level fuses?
What kind of flux do you use?
didn't design them to be fuses. 1.0mm diameter btw.

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so here it is mounted to a hardtail (for now). after 300kms there IS some noticeable wear on the belt:

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Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Jan 17 2015 11:48am
by jdevo2004
I like your belt and chain mods.

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Jan 25 2015 7:44am
by Overclocker
jdevo2004 wrote:I like your belt and chain mods.
thanks but i'm not sure if the mods did any good LOL. here's the belt after 500kms:

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Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 08 2015 11:03pm
by Overclocker
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1000km belt life not good enough. time to do chain conversion...

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 09 2015 3:19pm
by meelis11
Did you file off sharp edges of both toothwheels? Probably not, do it.
I did and my belt tooths look like new after 900km. Max they were lasted was about 800-900km but breaking belt is due to stock design (wrapping belt over too small tensioner and probably breaking/weakening fibers inside belt). I now modded that too - replaced belt with shorter version 260mm length instead of stock 275mm

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 09 2015 3:28pm
by Nobuo
Very very good soldering skills.
Are you using BMS?

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 09 2015 4:16pm
by r3volved
meelis11 wrote:Did you file off sharp edges of both toothwheels? Probably not, do it.
I did and my belt tooths look like new after 900km. Max they were lasted was about 800-900km but breaking belt is due to stock design (wrapping belt over too small tensioner and probably breaking/weakening fibers inside belt). I now modded that too - replaced belt with shorter version 260mm length instead of stock 275mm
Do you have a picture of your belt side? What else did you have to mod to fit the 260mm?

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 10 2015 5:12pm
by meelis11
r3volved wrote:
meelis11 wrote:Did you file off sharp edges of both toothwheels? Probably not, do it.
I did and my belt tooths look like new after 900km. Max they were lasted was about 800-900km but breaking belt is due to stock design (wrapping belt over too small tensioner and probably breaking/weakening fibers inside belt). I now modded that too - replaced belt with shorter version 260mm length instead of stock 275mm
Do you have a picture of your belt side? What else did you have to mod to fit the 260mm?
I started my build thread today and added belt mod post there too :)
http://endless-sphere.com/forums/viewto ... 3#p1032663
(it was 475mm length, not 275mm - fixed in my thread)

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 10 2015 10:24pm
by Overclocker
meelis11 wrote:Did you file off sharp edges of both toothwheels? Probably not, do it.
I did and my belt tooths look like new after 900km. Max they were lasted was about 800-900km but breaking belt is due to stock design (wrapping belt over too small tensioner and probably breaking/weakening fibers inside belt). I now modded that too - replaced belt with shorter version 260mm length instead of stock 275mm

yep i did. the motor pulley was particularly time-consuming...

i'm also using a much larger backside idler. less back-bending

btw i do a lot of off-roading that's why everything looks dusty LOL. some of my climbs are enough to stall the motor. probably contributed to the belt's early demise.

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 14 2015 5:11am
by meelis11
Overclocker wrote:
meelis11 wrote:Did you file off sharp edges of both toothwheels? Probably not, do it.
I did and my belt tooths look like new after 900km. Max they were lasted was about 800-900km but breaking belt is due to stock design (wrapping belt over too small tensioner and probably breaking/weakening fibers inside belt). I now modded that too - replaced belt with shorter version 260mm length instead of stock 275mm

yep i did. the motor pulley was particularly time-consuming...

i'm also using a much larger backside idler. less back-bending

btw i do a lot of off-roading that's why everything looks dusty LOL. some of my climbs are enough to stall the motor. probably contributed to the belt's early demise.
It still looks like some of teeth are still sharp. Maybe you missed some sharp edges?
But id you are almost 1000km mark and belt has not broken - so less backbending must help :) Did you mod it immediately (no riding in stock conf)?
btw, what is your idler diameter?

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 14 2015 6:41am
by Overclocker
Nobuo wrote:Very very good soldering skills.
Are you using BMS?
i would have to do w/ soldering for now. might get a spot welder in the future

no BMS. discharged as 12s but "folded" and charged as 6s w/ iCharger 106b+

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 14 2015 6:48am
by Overclocker
meelis11 wrote:
Overclocker wrote:
meelis11 wrote:Did you file off sharp edges of both toothwheels? Probably not, do it.
I did and my belt tooths look like new after 900km. Max they were lasted was about 800-900km but breaking belt is due to stock design (wrapping belt over too small tensioner and probably breaking/weakening fibers inside belt). I now modded that too - replaced belt with shorter version 260mm length instead of stock 275mm

yep i did. the motor pulley was particularly time-consuming...

i'm also using a much larger backside idler. less back-bending

btw i do a lot of off-roading that's why everything looks dusty LOL. some of my climbs are enough to stall the motor. probably contributed to the belt's early demise.
It still looks like some of teeth are still sharp. Maybe you missed some sharp edges?
But id you are almost 1000km mark and belt has not broken - so less backbending must help :) Did you mod it immediately (no riding in stock conf)?
btw, what is your idler diameter?
30mm

yep i modded immediately

anyway i'm giving up on the belt. i've just hacked the 80t belt pulley and turned it into a "spider" for the new 80T #25 sprocket. motor sprocket is 11T. should give decent reduction. pictures coming soon

PS i believe the only way to make the belt system work is to have at least an 18T motor pulley. but this means a very high tooth count driven pulley if you want a good amount of reduction.

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 14 2015 7:44am
by meelis11
Why you give up - did you brake your belt or does belt skip?

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 14 2015 8:15am
by Overclocker
meelis11 wrote:Why you give up - did you brake your belt or does belt skip?
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while out on a ride the belt started giving out a screeching / tearing sound so i immediately headed home since i didn't want to have to pedal back home :evil: some teeth on the belt had already partially broken off

anyway here's what remains of the 80t belt pulley

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 19 2015 12:02pm
by Overclocker
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Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 19 2015 12:18pm
by r3volved
Did you just lathe down that belt sprocket?

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 19 2015 1:01pm
by Overclocker
r3volved wrote:Did you just lathe down that belt sprocket?
angle grinder. while motor is running

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Apr 20 2015 1:00am
by Overclocker
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chain conversion done. 80T and 11T #25 sprockets from electricscooterparts.com

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: May 27 2015 1:01am
by Overclocker
now enclosed the primary reduction

shall be finalizing the battery box soon

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Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Dec 30 2015 12:07pm
by Overclocker
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Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Mar 08 2016 2:46pm
by Hummina Shadeeba
Maybe just get a better material belt. Is it Kevlar or just fiberglass?

Re: Mongoose Salvo, GNG 1.1 build (in progress)

Posted: Mar 09 2016 10:24am
by Overclocker
Hummina Shadeeba wrote:Maybe just get a better material belt. Is it Kevlar or just fiberglass?
oh i'm done w/ belts :) the consensus in the huge GNG thread is that the stock motor pulley is poorly designed and has too few teeth