Hi John here are some answers for you:John in CR wrote:Tigcross,
Awesome vehicle with a well thought out plan and great execution. That kind of layout permits a mountain of batteries for serious range at even greater speeds.
Here I'm subject to a vaguely defined 5kw limit than no one knows about to enforce, so I take full advantage of the liberal definition of what's allowed on the road without registration and taxes. Hell, I don't even need pedals, though I love the approach you took in that regard. My experimental ebikes end up as exhilarating highway speed capable fun machines for basic transportation, but it's time to step up my game with a fairing and rain protection.
What kind of wh/km are you getting?
When you go long and low, how do you decide on the steering geometry? Does wheel size make a difference? I've gotten lucky so far by just guessing and going with what looks right, but cutting steel and re-welding is easy. I'd want more confidence in the final result before going through the effort and time investment of a composite construction.
John in CR wrote:After another read-through I've got more questions. I've been sitting on a bunch of carbon, both cloth and uni-directional, and really want to do some form of composite layering like you've done. Under 50kg is great! Can you go into detail about your layering of the plywood and carbon with resulting thicknesses and how you joined them at the corners?
Have you done an all up weight at the front and rear tire? I ask because Electrom seems heavily rear biased with the pilot aboard, and my 9yr old long wheelbase cargo bike is my only EV that is drastically lighter up front. Riders have eaten asphalt on it more than any of my ebikes, all in poor traction situations, and I attribute it to being too light up front making the front wheel too easy to wash out.
Sorry John, I missed answering this one.John in CR wrote:After another read-through I've got more questions. I've been sitting on a bunch of carbon, both cloth and uni-directional, and really want to do some form of composite layering like you've done. Under 50kg is great! Can you go into detail about your layering of the plywood and carbon with resulting thicknesses and how you joined them at the corners?
I'd say! Apocalypse proof construction and a very impressive finish!tigcross wrote:... because there was no way to know if what I was doing was going to be strong enough I overbuilt it by quite a bit.
1JohnFoster wrote:I'd say! Apocalypse proof construction and a very impressive finish!tigcross wrote:... because there was no way to know if what I was doing was going to be strong enough I overbuilt it by quite a bit.
But if you want to experiment with design more cheaply, check out my other hero; http://www.carzari.ca/news.php 1/4" plywood edge joined with a borrowed pin nailer, finished with house paint. Sanding optional. A nice cheap way to experiment with design! I'm also impressed with his Monty Python aesthetics.This thing has been running for years. Last I saw him I wasn't able to catch up to him to ask if he improved on his non-redundant bicycle cable steering, nor if his wife still lets him haul the kids around. But he doesn't seem like the type to let the odd near-fatal accident stop him.
I agree, mine frame and body is heavier than it needs to be, but once you consider in the weight of the motors, batteries and rider you realize that trying to shave pounds and ounces off of the frame is pointless. I think a steel frame with composite panels will work just fine.John in CR wrote:Thx for those construction details. It's a big help. I thought Electrom looked overbuilt from the thicknesses I was seeing and your details confirmed it. I'll probably shortcut the process with epoxy impregnated ply to start, and then go carbon and glass once the basic form is assembled....maybe some harder to cut kevlar or kevlar/carbon cloth where I feel some additional toughness is required.
Re AL, I'll never go that route as I could never have confidence due to the manner in which it fails. It took the moto manufacturers decades to get it right, and since aero trumps weight at my speeds I'd always go with simpler to work and warning before failure nature of steel. Since I'm not pedaling a few kg is irrelevant to me, I'll likely go with a light steel skeleton and use composite panels to give it rigidity.
Thanks Seanatomy, alsways good to hear that others think you are on the right track. The Electrom is very comfortable on long trips, but also excels in congested city traffic. I've put up a quick little video of a short city traffic ride.Seanatomy wrote:Wow, beautifully done build. I wish I had the expertise to build something like that from scratch! Haha. I like the recumbent design and elegance of the layout, I like long trips on my bike so I can see how you can tackle a 100+ km ride in the electrom. Well done!
That's pretty funny, I'd not thought about it that way before. Thanks.Postby Drunkskunk » Mon Sep 18, 2017 7:14 pm
Wow. really nice build. First bicycle ever with a Rumble seat?
Well... Charles Mochet had pedal power with rumble seats in the 30's, but they were 3 wheel. Mine has a rumble seat too, but driving it has only reinforced the impracticallity of a wide track 3 wheeler. Last weekend I drove it to a BBQ and one driver tried to yell me off the road. I easily caught up to her at the next stoplight and tried to smile her out of it, but her point was kind of made. A lot of people put kids on the back of long wheelbase bikes, but they are completely exposed to weather.tigcross wrote:That's pretty funny, I'd not thought about it that way before. Thanks.Postby Drunkskunk » Mon Sep 18, 2017 7:14 pm
Wow. really nice build. First bicycle ever with a Rumble seat?
Crazy Victorians... Having been moving about all my life... Having lived in and visited numerous cities and places...tigcross wrote:Thanks for the review John, next time you come over let's make time for you to ride it and the street and for much longer. And a note to anyone else in Victoria, I am looking for test riders. I've been riding this vehicle for over a year now and loving it, but now I need feedback. Good and bad, it's all important.
Hi Shane, My Cycle Analyst is mounted to a carbon and foam beam that I made to support my windscreen, mirrors and fairing.Hi! What did you use to mount the cycle analyst? I'm looking for a solution on my kmx recumbent.