Stinky Turnigy 80-100 -Nuvinci semi auto

[gwhy!]

And, so it was, that after busting my freewheel, I discovered that I had also ridden through a huge pile of dog shit

http://www.youtube.com/watch?v=BFDsjOW1Q7Q





Burtie

Love the vid Burtie , yes you need to watch for that dog shit , when ever I go out with my mates on the cycle trials it always me that end up with it all over my wheels and only discover this when Im putting the bike back into the car to go home... its not nice .. what freewheel have gone is it the freehub or a screw on freewheel?.

[Metallover]

Awesome vid! I'm very impressed with how the bike handles!

Which freewheel did you break?

[Miles]

Yes, we need the full autopsy report, Burtie. Valuable info....

Shall I start a Post-mortem thread, so that we can log all failures for reference?

[AussieJester]

Outstanding video Burtie... peoplez... if the hairs on the back of your neck don't stand up at the
sound of that outrunner your not only lacking testrone but gonads IMHO
Lovely stuff Burtie, bikes awesome, look fantastic, rides well, love that helmet & .....
ya look good ridin' it mate .....thanks for taking the time to film this and edit the footage
for the forum mate props to your 'wife/lady friend?" excellent job behind the camera also.
The broken freewheel will be rectified with a higher quality ENO no doubt? and then good to go again

KiM

p.s this is the exact spacing on the halls sensor mount, as you posted my way mate?

EDiT: i should get some t-shirts printed Burtie..."I 'd rather push my RC motored bike home than
ride a frock powered bike"

[etard]

Awesome vid Burtie! Poppin wheelies with the best of em!!

Does that bike fell comfortable? It almost looks like you could go a size bigger. Especially with all that nose lifting nonsense.

[Burtie]

Glad you liked the short video, we had a lot of fun making it

Yes, we need the full autopsy report, Burtie. Valuable info....

So the autopsy began....

The freewheel on the output of the gearbox appeared to have failed, but after dismantling it semed to be ok.
I examined it at length, trying to work out what the problem was ...

Then my GF took a quick look and pointed out that the flange had sheared off the freewheel adaptor

Compare broken and new freewheel adaptor

The inexpensive Dicta freewheel was fine but did not transmit torque because the adaptor was able to screw right through the middle since the flange was missing.

The freewheel adapters I bought from Staton-inc (USA). These items seem rare and hard to ge hold of. Does anybody know another source that they can recommend for these things?


This incident now gives me the excuse to gear the bike 10% higher by fitting a larger sprocket to the gearbox output. This is something I have been wanting to do for a while, but never got around to. Will be interesting to test the new top speed

Burtie

[Burtie]

Does that bike fell comfortable? It almost looks like you could go a size bigger. Especially with all that nose lifting nonsense.

I Bought the frame on Ebay, The bloke said it was a big 'un, but when I went to collect it, it turned out a medium

It probably would be better at speed if it were bigger but I kind of like the agility of this small frame off-road

KiM wrote:
p.s this is the exact spacing on the halls sensor mount, as you posted my way mate?

EDiT: i should get some t-shirts printed Burtie..."I 'd rather push my RC motored bike home than
ride a frock powered bike"

AJ,
The motor now in this bike is a new style Turnigy 80-100B (with the skirt bearing) that i fitted with internal 120 degree hall sensors.

I love the idea of the printed t-shirts

Burtie

[liveforphysics]

I love the vid, and love the bike! Great work Burtie!

[dbaker]

Burtie,

I got some 5/8" ID freewheel adapters from sickbikeparts.com (http://www.sickbikeparts.com/catalog/pr ... taatf3cpt6)

They are aluminum with a shoulder that is close to 1/2" thick compared to the thin one on yours.

[flyinmonkie]

You can also get them from Choppers US in steel. They have a 15mm ID though.

http://www.choppersus.com/store/product ... l-Adapter/

Clay

[AussieJester]

So not only is your girlfriend excellent videographer
she can also diagnose your broken e-bike problems!... shes a keeper Burtie hehe

Recumpence does a neat aluminium adapter with
2 beefy set screws, using one myself, as with all Matts's
products this too is high quality item.

I have 3 of those ChopperUS adapters also, the hole in them is 15mm not sure the size you Need? they are also steel not aluminium...

While your awaiting delivery of an adapter, you could easily fix the broken one IMO. Drill and tap a series of 3-4mm diameter holes around the side of the adapter, cut a disk from appropriate sized aluminium that can be bolted onto the side of the adapter and work as a "shoulder" should be strong enough to get you buy no?

Look forward to seeing more video Burtie i watched iabove vid like 5 times now and still makes me grin like i do when i ride my own bike haha

Best of luck Burtie...

KiM

EDIT:

p.s i think it would be very wise move to also pick up an Eno Burtie....will avoid another "walk of shame" moment in the future as we know those cheapo freewheels won't go the distance with that sort of power :: wink ::

[Burtie]

Thanks for the tips about the adaptor guys.
I took your advice and used a wide flanged version, bored the centre out and filed a keyway.

The revised gearing improves the top speed a bit

http://www.youtube.com/watch?v=ciTdz1cjgeY


I wonder what is gonna break next

Burtie

[TopCat]

I wonder what is gonna break next

Burtie

Your neck? Sorry mate only kidding
I hope its only a bike part that brakes and not any part of Burtie.

What speeds are you getting?

Regards
Tom

[archer-ca]

WHOA!!! The start of the video startled me!! The Stinky sounds great and you're booking it nicely. Thanks for another great video Burtie.

I think breakdowns and repairs seems to be the norm with our homebuilt ebikes. I've a full rebuilt going on for my Cyclone 1200 and a 2nd ebike on the "to-do" list for next year.

Keep up the great work Burtie and keep 'er shiny side up!

Cheers!

Norman

[Burtie]

So not only is your girlfriend excellent videographer
she can also diagnose your broken e-bike problems!... shes a keeper Burtie hehe

Yeah you are right! ... -I wonder if she is any good at welding??

... p.s i think it would be very wise move to also pick up an Eno Burtie....will avoid another "walk of shame" moment in the future as we know those cheapo freewheels won't go the distance with that sort of power :: wink ::

Still using the cheapie Dicta freewheel at tho mo, seems to be holding up ok, but have an ACS one on order incase it gives up.
Call me a cheapskate, but I am not quite comfortable with the cost of a WI freewheel so I will hold out as long as I can!

I wonder what is gonna break next
Burtie

Your neck? Sorry mate only kidding
I hope its only a bike part that brakes and not any part of Burtie.

What speeds are you getting?

Regards
Tom

Cheers Tom!
The speed in the vid was 40mph (64kph)

.... keep 'er shiny side up!

... and rubber side down. Thanks Norman,

[Goethe]

Great build Burtie!!!

I got a Kona Coiler at the moment that I use for DH riding. The plan is to put motor on this winter and I'm started to plan which way to go.
I really like the way you solved it with the standard gears in use for the motor transmission.

-But I can´t figure out how you build the freewheeling of the front sprocket?
-Could you please explain in detail how this was done?

ENO freewheel for $89.95 http://www.sheldonbrown.com/harris/white-freewheels.html


/Goethe

Gesunda DH park Sweden

[AussieJester]

-But I can´t figure out how you build the freewheeling of the front sprocket?
-Could you please explain in detail how this was done?

Burtie is using an oild cyclone crank, you can buy them from sickbikeparts for ~25 bucks the freewheel screws onto the crank you then bolt your sprocket to it, you then bolt another sprocket to that sprocket on it runs the motors chain drive. If you want higher end freewheel cranks trials freewheeling crank sets are available for 6 times the price.

KiM

[Goethe]

-But I can´t figure out how you build the freewheeling of the front sprocket?
-Could you please explain in detail how this was done?

Burtie is using an oild cyclone crank, you can buy them from sickbikeparts for ~25 bucks the freewheel screws onto the crank you then bolt your sprocket to it, you then bolt another sprocket to that sprocket on it runs the motors chain drive. If you want higher end freewheel cranks trials freewheeling crank sets are available for 6 times the price.

KiM

Aaah, brilliant!

I´m a bit slow so it took me a while to get it...

-Are the sprockets mounted on each side of the freewheel using the same bolts?

/Goethe

[Goethe]

(The first test run ended after 400 yards in a pile of mangled bike chain )

I really suggest that you use a real chain guide and tensioner!

I use this one and my chain never jumped even if going 30 mph down a rocky DH track.


/Goethe

[Burtie]

Hi Goethe,

Fantastic picture!

The freeweeling crank set is indeed a Cyclone part that I bought direct from Paco at http://www.cyclone-tw.com/order-E.htm

I think they can even supply a ready-made 3 chainwheel version of it now.
Some people critisize the quality of them, but I have been using them on 3 different bikes for over a year, without any problems

I modified the 1 chainwheel version by bolting a 2nd 44 tooth BMX chainwheel to the inside of the existing one, using bolts through the chain guard ring fixing holes.

I look forward to reading about your Kona e-conversion

PS. Nice looking tensioner. I would consider something like this for future builds if I ever get any more chain throwing problems.
Burtie

[Burtie]

With the onset of the rainy season I decided to try a bit of weather proofing...

Two hours, much Duck Tape, some plastic cartons and a tin of spray paint later, a reasonable looking, stealth enhancing, screw-on motor and wiring splash guard:

Waterproofing.jpg (133.49 KiB) Viewed 893 times

More Waterproofing.jpg (107.38 KiB) Viewed 900 times

Some testing showed that it keeps the muck out but, perhaps not supprisingly, it limits the cooling airflow around the motor too much
The addition of the skirt bearing on these newer Turnigy outrunners does not help the cooling, because the bearing mounting cause a restriction, less air is drawn through the motor when it is spinning to help cool the stator and magnets.

... so back to the drawing board, ...maybe some forced cooling required ?


EDIT: Just removing one side of the shield improves the cooling a lot, I think there will be no problem now during hard use in our English climate




On a different tack... I recently aquired a 51v 3kw switched mode power supply.
This is a real beast. When you first turn it on, the inrush causes all the lights in the house to flicker

PSU 3kw.jpg (88.5 KiB) Viewed 900 times

When I work out how to tame this thing a bit, I should be able to charge my LiPos from empty in 30 minutes

Of course you need somewhere safe and dry to perform this stunt, so -cue the new metal LiPo charging bunker......

LiPo proof bunker

Charging Shed.jpg (165.68 KiB) Viewed 900 times

Burtie

[etard]

Nice Burtie! I'm glad you have piled it high with twigs and dry branches, should be a real youtube extravaganza.

[Burtie]

I think I might have stored my petrol cans in there as well

[liveforphysics]

Hell of a nice DC/DC you've got there my friend!

That thing is going to love LiPo.

I'm doing 8C charging on my helicopter LiPo packs (turnigy nano), and they stay room temp. 2C charging should be a walk in the park for your packs, I bet you don't even feel any warmth on them at full tilt with that monster charger.

[Ludo91]

Hi, I see you put hall sensors in your ebyke motor. exactly what hall sensor have you used? may you tell me its specific code so I can look it up on DigyKey?
thankyou so much, I posted this question too in another 3d where a discussion about hall sensoring htx motor is up, I hope it`s not double posting in a 3d of yours
Many thanks, Ludo