Project #3. Two motors, Three wheels, Six grand!

[MitchJi]

Hi Matt,

Also, I got the front rotors to blue from the hard riding.

I love it!

Matt

How big are the rotors?

Glad to hear you love it but is this really a business or an excuse to have fun?

 

[damcard]

Wow Matt! Simply amazing.

 

[johnrobholmes]

Vids!! Vids!!

 

[recumpence]

Hi Matt,

Also, I got the front rotors to blue from the hard riding.

I love it!

Matt

How big are the rotors?

Glad to hear you love it but is this really a business or an excuse to have fun?

Shhhhhh!

Don't type that so loud. My wife might hear! :wink:

Matt

John, you gotta make a trip up here and take it for a spin.

 

[johnrobholmes]

What is it, about a six hour drive? I would be up for it!

 

[recumpence]

I am in McHenry county (Island Lake) Illinois. It is probably about 6 hours.

You are more than welcome to come up for a visit. I would love to see you swing by.

Matt

 

[recumpence]

http://www.youtube.com/watch?v=VvsylaPU7S8

My kids are playing in the tree here. The weather is cold, so there was alot of wheelspin. You can hear on the last run, I stopped just out of the frame and did a dead stop burnout. You can hear the tire squeal.

I am running 35mph as I leave the left of the screen on each run. It is wheelspinning and drifting the entire way.

After this video was shot, the motors were 110 degrees, the ESCs were 100 degrees, the rear tire was 130 degrees, the front tires were 110 degrees and the rotors were 240 degrees.

Matt[youtube][/youtube]

 

[MitchJi]

Hi,


[youtube]VvsylaPU7S8[/youtube]

 

[GGoodrum]

You need to get a helmut on that shiny noggin of yours...

 

[12p3phPMDC]

dude!!! :lol: :lol:

 

[recumpence]

You need to get a helmut on that shiny noggin of yours...

Chrome dome.

Matt

 

[recumpence]

I really need to get a few shots from higher up, looking down. You cannot see the huge drifting that is happening. The sound is pretty much as it really sounds. This thing is really quiet. I may go up from #25 chain on the primary reduction to #35 for durability reasons. But, I like the quiet I have. I just got some extra heavy duty #25 chain. We will see how that holds up to the pounding of the first stage.

If you listen close, all you really hear under power is the tire spinning. When coasting, you can hear the freewheel on the jackshaft spinning.

As I leave a corner (or start out for that matter), the tire instantly hits 45mph of wheelspin and just holds there untill the trike catches up with the tire.

When the street is hot, or on new pavement, the trike would be wound out from 0 to 40mph in about 3.5 seconds. In this weather, it takes almost 5 seconds to hit 40 because of the wheelspin.

I am ordering a wider rear rim (44mm) and a wide tire that I will run at lower pressure. That should give me the hook I need even in cold weather.

Matt

 

[Grinhill]

That looks like SOOO much fun!!!

Do your kids pester you to have rides all the time? Or do they just take no interest because that's just what their crazy dad does all the time?!!!

 

[VRdublove]

Hahaha!! That is awesome. I was laughing for the entire length of the video. I love the fact that your kids are playing fairly unphased by you doing nasty burnouts back and forth. It caps it off when your son says "Dad is crazy."

That's a classic video. Nice work! Oh, the trike is cool too.

 

[Storm]

You've done it again.

Thanks Matt.

 

[liveforphysics]

That is badass Matt! Great job! Your trike screams!

 

[etard]

Ridiculous Matt, just a blur of technology. Maybe you could mount the camera on the trike sometime. Or even have a friend videotape you in a parking lot sometime.

 

[recumpence]

I think mounting the camera on the trike might be a good idea. You would get the idea of how much drift there is and how strong the accelleration is. Stationary videos really stink in their ability to communicate such data, but seeing things blur by as I ride (drive?) by and how hard this thing corners would be a decent representation of the speed.

The video represents 90 feet of distance from the corner to my driveway (when I leave the screen). I am over 35mph as I leave the screen and in less than 1 second more, it is wound out at 45mph.

When the tire hooks better, it is at 45mph at my driveway.

Anyway, I want to get some efficiency numbers for you guys too. Plus, I finally let it charge long enough to give me the typical 98% charge I normally charge my lipos to. In the video, it was only at 88% state of charge.

Matt

 

[deecanio]

LMAO. :lol: :lol:

dad IS crazy indeed!!!!
i'm sending my bike over for a rebuild Matt :wink:
just awesomely fast

D€

 

[recumpence]

OK, I installed a speedo and here are the results.

The gearing is unchanged from what you saw in the video.

Top speed an even 50mph! Again, that is geared identical as in the video. So, geared for 50mph, it smokes the tire!

Tire smoking wheelspeed, 46mph. The tire breaks loose and smokes at 46mph from a stop and ramps up to 47 or 48mph as it spins and accellerates. At 48mph, there is no more wheelspin. Then it tops out at 50mph.

It accellerates from 0 to 40mph (if modulating throttle for best hook, after heating the tire) in right about 3.4 seconds. This depends alot on the pavement, ambient temp and tire heating.

Efficiency at 25mph, roughly 25wh per mile.

I have not take efficiency readings at 50mph yet.

So far, no problems, other than a fried rear tire.

Oh, it looks like I have a buyer for $6,500.

We shall see!

Matt

 

[Ypedal]

Daaaamn ! me like !

 

[recumpence]

The trike is sold!

He is picking it up Sunday. That is good timing because I have a large number of family members coming in from out of state for a couple memorial "Services" (sprinkling ashes) this weekend. I will have it here long enough to show my family. Then it is on to a new home.

I got $6,500 for it.

The next trike will be very similar. However, I will be implementing a few changes.

#1 More stealth (less messy wiring). The new owner is totally familiar with RC equipment. So, he does not mind the complicated "Plug it in to turn it on" arrangement. However, the new trike will have a nice key switch and a 4110FET turn on "Contactor" for better useability.

#2 I will probably weld together a battery box out of sheet rather than box tube. This will better conceal the huge lipo pack as well as be safer in case of any, uh, mishaps.

#3 I will lace up a wider rear rim for a wider tire. More traction is definately needed.

#4 I plan on going crazy with the look of the next trike. That includes powder coating the rims and hubs one color, the spokes another color, and an overall two-tone color sceme over the entire trike. Oh, the seat cover will be embroidered with the "Recumpence" name in some cool, large, Heavy-Metal font in a color to match the rims.

Basically I want to do a true Orange County Chopper style radically awesome looking build.

I have a Typhoon here that will recieve a single 3210 drive. That will be done in a couple weeks. The new crazy trike will be built over the next few months.

Matt

 

[grandmasterE]

3ft of 10awg for +and - leads with 250amps across it will drop ~1.52v

3ft of 4awg for + and - leads with 250amps across it will drop ~0.375v

3ft of 4wg double runs for + and - leads with 250amps across it will drop. ~0.1875v (this is what I switched to using for my bike).

An extension of this calculation that I think is important to remember is 1.52 V drop at 250 amps is 375 watts of heat loss to dissipate in the wire alone. I think that's reason enough to go larger. It's easy enough to calculate the temperature rise over any period of time for 375 watts input to that small amount of insulated copper.

E

 

[recumpence]

The next trike will use 12 inches of 8 guage wire to the motors. No problem there.

Matt

 

[wasp]

nice little niche market you have matt
funny you mentioned OCC i think your well on your way to becoming the OCC of the ebike world...a line of rides for most and custom whips that some can own
keep up the great work
ps how about that dual 3220 setup on a well built chopper ...