So I played around with the 4238 mini motors (see boosted boards reverse engineering build https://endless-sphere.com/forums/viewto ... 35&t=56839
) and had a lot of fun.. very strong and awesome... learned quite a bit
Then i moved on to build a run of the mill 6s, ezrun, tacon bigfoot build using the same 36" aluminum board... again awesome and an incredible learning experience. Played around with the design (specially the 10 iterations of motor holders) as well as some of the electronics to find a design that would hold up 200 kms without having to tighten or do any work on it as I have really gotten to really enjoy my daily rides, and now venture farther out...
However living in the republic of Panama our roads are not the greatest... they are more concrete than asphalt and more than a little on the rough side. Speed bumps also tend to have 1" -1 1/2" lips as do the wheelchair accesibility ramps making even my 98mm abec 11s either come to a complete halt or at least give me a significant jolt and sometimes force me of the board. Figured I either dealt with it... or asphalted every street in my country, or took up bicycling. Well guess what.. there was another option
, Thanks to made_in_the_alps_legacy I saw the 7" wheels I needed.. if I could not make the potholes smaller I could go with bigger wheels, these babies are over twice as normal 83mm tires and 80% bigger than my already oversized 98mm abecs.
Using these wheels required me to completely redesign my aluminum board, so this became a whole new proyect...(or use 3 " risers LOL). So a new aluminum board had to be milled... Worked for a couple of weeks on alternatives till I settled on a 45" long tapered dropthrough design.. cut it out of ply just to verify the huge wheels had enough leeway, nope.. back to the drawing board... the second plywood one worked fine so I milled that one out..... Also I wanted a 12s capable system, although I changed my batteries (and extended my life expectancy) to 8s the first day after (very) briefly trying the mockup on 12s power. However the 12s ESC does not have a break alternative, (and my foot braking leaves much to be desired at 50 km/hr) so an alternate breaking system had to be implemented as well... so again a couple of weeks went by while the solution made itself aparent. Scooter Band brakes controlled by a servo.. and hopefully a secondary emergency braking system...
Being the SW nerd that I am.. I figured a couple star wars designs would break up the monotony of the aluminum finish... so I engraved my ubiquitiuos "Do or do not, there is no try" as well as an Imperial shield and Fett's shoulder emblem.. as well as some grip tape (or sandpaper stickers? dont know the name) on top
The Name of the board is my son's nickname " Destroyer " and o yes..he earned that nickname...
Well the parts got ordered.. Including
Electric scooter parts 60mm band breaks http://www.electricscooterparts.com/bandbrakes.html
#25 sprockets and chains http://www.electricscooterparts.com/spr ... chain.html
Turnigy 10 kg servo, 2 5000mah 4s batteries in series, a Quanum controller, a Sentilion 12s HV ESC all from Hobbyking International Warehouse as several are backordered in the US,
Tacon 245Kv 6264 from http://www.hobbypartz.com/96m608-bigfoo ... 245kv.html
Run of the mill bicycle wire tubes and wires to conect brake and servo...
Onda wheels http://shop.ondamotion.com/onda-vibe-polymer-wheels/
Custom made aluminum motor mount , aluminum brake holder, both welded on Bear 10 inch trucks
45" long 10" wide 1/2" thick Custom Aluminum board with dropthrough truck mounts
The brake servo is connected to the third output of the controller.. originally thought it might need to be squeezed carefully so as not to throw me off, but the band braking compares to normal 25% braking on my HK150.. I might actually be tempted to add another one in the future, maybe next week future...
The chain/sprocket mount lenght calculation was complicated and actually intimidating till I found the http://www.killerbotics.com/kbtools/Spr ... lculators/
it does for chain and sprockets what the SDI table does for pulleys and belts. The motor mount design was quite easy and straightforward from then on... The chain looks and feels ok, although not as elegant or quiet as the 15mm belt design in my smaller board. Belt slipage however I believe is now a thing of the past.
The board comes in at under 9 kilos which is not so bad.. maybe wouldnt want to lug it around for blocks and blocks but to and from the car to the riding area it is ok.. also cut out come carrying handles, although since the board is quite rear heavy they turned out to be " not so comfy".
I have riden it twice, and have gotten up to 48.5kph on 7s and will go again next week at 8s... I skate in full motorcycle body armour as I like to go fast.. and am seemingly uncoordinated... (this pic is of me on my other board, no pics of me on the destroyer yet)
It is quite roomy and confortable with a nice degree of flex, the wheels roll over everything and eat just about all the bumps... will have to work on the brakes a bit.. but the acceleration is awesome, for now maybe too awesome.. very ahppy with it so far..
It is not practical or a good last mile vehicle.. it is a head turner, attention getter... and does this very well.