So, who's hiding a project?

[deecanio]

too quiet around here indeed
there really is no conspiracy though, i think most of us have issues to resolve and are waiting on resolutions/parts to play around with, although our rc setups landed last year we'll all trying to tweak them for this summer.Of course there is enoobs stank but thats the real reason for the exodus - love al bundy by the way enoob, he's still on good form in "modern family" by the way
the usual suspects have builds in the closet mind :wink: but people in greenhouses etc Matt!!!
havent seen Gary for a while either nut know he is working like a trojan on other stuff.
btw Luke did you get the freewheels and etard any advance on the sprockets????????


OOOOOh i do have something to show!!!!

i'll be back later today with something for the motorcycle boys !!!!!!!!!


D

 

[liveforphysics]

btw Luke did you get the freewheels and etard any advance on the sprockets????????


D

Yup, I got them last week. I'm going to broach them sunday, I've been focused on the cell testing thing for the last few weeks, but I haven't forgotten about you.

 

[deecanio]

no worries brother, im just glad your doing them for me, along with the sram inspection all my eggs are in your basket!!! where better


D

 

[John in CR]

Summer is for RIDING!

Matt

Yep, and our raining season ended way early, so with my choice of "work or ride", ride has been winning out. I actually had to charge up 4 times the other day, and 3 charges in a day is getting pretty typical.

I have started work on 3 ebike projects, but I haven't made enough headway to show anything interesting. Soon that will change, because once I get going I work fast.

John

 

[drewjet]

Well my electrathon is 99.9% done, just need the mirror attachments welded on to be 100% ready. And it damn well better be ready as I have my first race next Saturday.

Awaiting on the arrival of my Group Buy 3220 and Matt's reduction drive, then I can determine if it's going on a Hardtail or full suspension Mountain Bike. Got my 8th Turnigy 6S 5000 MAH pack on it's way.

 

[Thud]

I knew this would get a rise:

I wrote: Besides, No one can out power Recumpence.....

It is as I suspected. There is an unspoken contest of one-upmanship going on here.
Its only a matter of time before the "race" begins....Where is "safe" when we need him?

Any one interested in going to the I.O.M. tt race this year? Spectating schmectating. A super lightweight road racer may be competitive against a twin Agni motored heavy weight. I wonder if we could build it?......time to look for tire sponcers.

I may be e-baying all my vintage moto stuff to get a "concept" bike rolling. 8)

 

[deecanio]

i have something very intersting to show you thud on this very subject :wink:
watch this thread closely today!!!

D

 

[recumpence]

How about 30,000 watts, 115 pound all-up-weight, enough Lipo for 60 miles of cruising or 30 miles at 60mph?

All this in a completely reliable, daily driveable layout.

I have a pile of parts on my desk right now, 30 pounds of Lipo in a box in my office, a bike hanging from my garage ceiling, Hope 4 piston brakes new in the box, brand new controllers, sprockets, freewheels, and other bits just waiting to be bolted together. All I have to do is wait on a few bits (motors, for one thing), and start cutting the frame apart for modding.

Oh, anodizing and powder coating. LOOOOOTTTTS of powder coating!

Matt

 

[liveforphysics]

Thud- You KNOW I'm down for anything with racing bro!!!! Also, just like how I punish the big-block V8's all day long with super-civic, winning through being extremely lightweight is my favorite method.

I think the TTGP thing requires a pro-race licence though right? Do you know anyone who has 10lbs balls, a pro-race licence, and no issues with riding a 100lbs DIY bike? I bet there is somebody out there with a pro-licence who would love to do it. Like most 2 wheel races, rider is probably 90% of what wins that race though, so I want a rider who embraces death with open arms every time he rides.

If we could get cell_man into it, we would most likely have the absolute best battery option possible for this race. The prismatic A123's kill Kokams, and Kokam's won it last year.

I've gotta get to bed, but you've got this idea firmly planted and brewing inside my brain now.

 

[liveforphysics]

How about 30,000 watts, 115 pound all-up-weight, enough Lipo for 60 miles of cruising or 30 miles at 60mph?

All this in a completely reliable, daily driveable layout.

I have a pile of parts on my desk right now, 30 pounds of Lipo in a box in my office, a bike hanging from my garage ceiling, Hope 4 piston brakes new in the box, brand new controllers, sprockets, freewheels, and other bits just waiting to be bolted together. All I have to do is wait on a few bits (motors, for one thing), and start cutting the frame apart for modding.

Oh, anodizing and powder coating. LOOOOOTTTTS of powder coating!

Matt

It's gonna be awesome Matt! You're getting super refined with every build, I can't wait to see all the CNC eye-candy you've got in store for us.

Speaking of CNC... In a couple of weeks mine will be here.

 

[diver]

I'm rebuilding one of my trikes. nothing big just adding a rear drive along with the front hub drive. the rear drive is just a boost from a dead stop if on soft ground . also adding a dual hydraulic rear disk pistons to help aid in the stopping power.I only run at 72 volts so bike weighs in at about 500 with operator..lol

 

[rkosiorek]

Actually not a bike at all. but a dynamometer.

the original frame was a bit too flexible so i added some reinforcing and nearly a box full of 1/4-20 cap screws. for the dropouts i have a couple of 3/8" thick heat treated 12L14 plates.

need to finish the motor load. i'm using a pair of EV-Warrior motors as generators for the load.



i've also discovered that it makes an excellent jig for building hub-motor wheels.

rick

 

[Tiberius]

Did someone mention a ducted fan and cooling?



Picture taken earlier today. Runway closed to normal fixed wing traffic.
Its also a clue to my next devious project.

Nick

 

[liveforphysics]

That looks like loads of fun Nick! Make sure to have a build thread!

 

[rkosiorek]

tiberius,

is that a hovercraft? do you plan on using an electric for the lift as well?

looks like fun. too bad i hate the cold and snow. but if i had a chance to play with a toy like that... i might tolerate it for a couple of hours.

rick

 

[recumpence]

How can someone in Canada hate snow and ice? Isn't that a bit contradictory?

Matt

 

[rkosiorek]

How can someone in Canada hate snow and ice? Isn't that a bit contradictory?

Matt

not really, used to really enjoy it when i was younger. but now it is a big pain in the a$#. heck i used to go camping with a bag and a tent in weather like this. but then i used to do a lot of foolish things when i was young and resilient. but not these days. these old, damaged bones find so many ways to complain about the cold.

besides the spring, summer and fall are usually brilliant.

i had the Machinist making up some parts for the Dyno this afternoon:
View attachment 2





actually i returned home from grocery shopping and i found him at home on top of the mill.

rick

 

[j3tch1u]

seems to me there are more than a few custom builds going on that are in the "Hush-Hush" catagory.

Guilty as charged [raises hand in shame] One of my five dogs ate it :wink: Seems every time I sit down to write they start pestering me to a) feed them b) take them to the park or c) immediately stop whatever I am doing and give them my undivided attention.

Rest assured what little time I have to myself is spent seeking EV nirvana. Gratitude goes to all the big brains here on ES for laying the prior groundwork and motivation.

Lately I've been trying to mate a magnetic clutch (for brake regen) with a compact planetary drive--two 75 series Matex gears (total 12:1 reduction) powered by a 10-turn Astro 3210. The mid-drive system is mounted on the swing-arm and uses a dual freewheel threaded onto the clutch hub that drives a Nuvinci CVP dev kit servo controlled gear hub. The Nuvinci lets you store 5 shift maps selectable by push-button for various pedal or motor configurations. I plan to run: 1-pedal only, 2-pedal assist, 3-hill climb, 4-high torque, 5-high speed. The first prototype was a no-go--holding power of the clutch wasn't strong enough for the torque of the motor. Now modifying my design to use a wet type multi-plate clutch that should be good for 25 Nm.

Sadly, my build thread has been sitting stagnant in my folder for some time. I will try to post after nailing down more specifics--specs, design goals and test data. For now, here are a few teasers:

View attachment 4

 

[Tiberius]

tiberius,

is that a hovercraft? do you plan on using an electric for the lift as well?

looks like fun. too bad i hate the cold and snow. but if i had a chance to play with a toy like that... i might tolerate it for a couple of hours.

rick

It is indeed a hovercraft. That particular one is powered by a nasty 2 stroke snowmobile engine, but I'm working on something different. Jeremy Harris on here is also looking at electric hovercraft.

I hate the cold and snow too; I just wasn't designed for it.

Nick

 

[recumpence]

2clue is also working on a hovercraft project.

Matt

 

[12p3phPMDC]

j3tch1u,

The drive is bad-ass. Good job building the planetary gearhead!



Too bad about the clutch and regen problems. Despite the problems, the planetaries
make an extremely compact drive.

IF only you could bypass the planetaries during regen, the
the holding torque of the clutch wouldn't need to be so high. that's a tough problem.

Are you using a 3:1 followed by a 4:1?
HAving series planetaries allows you to go from 9:1 up to 25:1 in the same case
pretty easily using the matex modules.

good job!

Hows the noise from the gearbox?

 

[enoob]

that is a rather sexy little planetary.

 

[j3tch1u]

j3tch1u,

The drive is bad-ass. Good job building the planetary gearhead!

Too bad about the clutch and regen problems. Despite the problems, the planetaries
make an extremely compact drive.

IF only you could bypass the planetaries during regen, the
the holding torque of the clutch wouldn't need to be so high. that's a tough problem.

Are you using a 3:1 followed by a 4:1?
HAving series planetaries allows you to go from 9:1 up to 25:1 in the same case
pretty easily using the matex modules.

good job!

Hows the noise from the gearbox?

thank you for the kind words 12p3phPMDC yes, it would be nice to bypass the gearbox on regen but haven't been able to think of an elegant solution (with my small brain). although they spin easily in reverse when detached from the motor shaft, not sure how the drive would hold up to high braking torque in actual use. i've seen some magnetic dog clutches that could hold up to the torque but they are usually rated for low engagement speeds.

you are correct, i am using 3:1 followed by 4:1. running the drive dry, noise was quite high. however, with a little white lithium grease and rubber gaskets, noise was significantly reduced (somewhere between a cyclone and a belt drive). this is also in part due to how quietly the 3210 runs. nice thing is, the faceplate/gearboxes/housing act like a big heat sink. i am going to make a copper spacer to substitute their plastic one for even better heat dispersal. all-in-all the non-clutch compact drive works just fine with one caveat. if you're gonna run a 1-way clutch bearing--the 12mm keyed matex shaft is unsuitable--the keyway and small OD will cause it to seize and disintegrate. i needed to make a 20mm OD locking shaft collar to give the 1-way bearing smoother/larger contact area.

 

[kfong]

j3tch1u, nice cnc work. Post more pics. I like to see more detail on the mid-drive setup you have. Pics on your CNC shop as well, I can tell you got some interesting tools to play with.

I’m in the collecting stage for my next bike even though I’m currently working on my BMC build. The winters in Mich. are rather long so hopefully I’ll have 2 bikes ready by spring. There have been so many good RC builds, that I’ve decided to build one too. The numbers were just too enticing not to. The bike is a TidalForce from Oatnet. Good buy, if you need a frame. I’ve picked up a Rockshock tora SL for the front. The motor I have is a Turnigy 80-100-A 180Kv. It would have been nice to go with the Astro, but I saw no easy way to put hall sensors in it, and the current Turnigy motors look pretty good to me and the price was right. The gearing is from Allelectronics planetary 4.5:1 gear by currie motors, but I believe it’s actually produced by Matex since it looks very similar. I picked up 2 of them in case I need to stack them. I will need to CNC a case for them as well as a custom motor mount. The batteries are A123’s. I do like the current development with the 15/20 ahr LifePo4 packs sold by cell_man. Since I have the A123’s, I’ll be staying with these for the time being. It will be a mid-drive setup with the motor in front of the down tube and the batteries custom built into the triangle. I’m also thinking of a dual free wheel setup, so I need to get with liveforphysics on that front, and if I can find a good deal on an SRAM dualdrive on ebay or if someone here has one or know of a place that sell them at a good price? My goal is to have a kickass RC trail bike. My BMC build might satisfy me, but without an RC setup to compare it to. I will keep wondering.

Currently I still need to pick up a brushless bike motor controller, Methods do you have any kits left over with just the barest components? I don’t even need the fets.
half twist throttle
dual freewheels. Liveforphysics what do I need to do to get a set made?
Sram dualdrive anyone got one to sell?

 

[biohazardman]

The house got a new roof for Christmas the Giant did not get it's Lipo yet, the voices grumble. Just got the headlight built and installed, I still need a brake light hack, turn signals and probly a couple of the ducted fans you pointed out for the voices to be happy. Thanks to you and liveforphysics for the idea should be fun. If either you or hear of anyone doing anything with the fans I want to know at what RPM they sound the best.
I have a couple of ideas. Still wondering what I am going to do with the 2 Tidalforce frames I have. I have a son-in-law in Salt Lake that thinks he should have an electric bike to get to work. He did not say how fast it needed to go. ;^) Got to scrounge up the funds though so it will be a few months. You and the others have started me down the road of no return I am sure. More voltage and more amperage will get me there faster? Many ideas just takes lots of time to finalize them and longer to get a round-toit as they are few and far between at my house. I do however need to do something to make people drool on their keyboards like you and others have done for me though.