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Desert Scorpion

Tucson, AZ

Published: 2023-08-02

Other Geared Hub

Tadpole Trike

HPV Scorpion FS26 Recumbent Trike evolved into Geriatric Shifterkart.
Full featured Assist thanks to the CA3 and Torque Sensing BB with a throttle and variable Boost dial.
Grippy tires on wide rims, tuned suspension, its simply a dream machine for the foothills of Arizona.

• 52V 14.9AH Potted Battery mounted underboom
• CA3 with external 5VDC 5A Convertor
• Thun BB + Twist Throttle
• MAC 10T
• 44/32/22 Chainrings, 48/11 Cassette
• Shimano M785 Hydro Brakes
• High grip tires on wide rims
• Tuned 3 way adjustable dampers

Underboom Battery design model uses fixed tray with slides mounted to battery. 36 pieces.
Lock mechanism not shown, and has rattle-proof clamps.
Low frontal location gives notable improves to stability at the limits.
5.9 — HPV Underboom Battery Mount Render

CA3 mounts on Derailleur post with wiring closet. — HPV Frameset top view

Thun makes extremely accurate torque sensors that I've used on some of the precision industrial drives I've designed. None of the sensors are actually in the business of sensors.
This one is 7+ years old never a hiccup. — Thun Torque Sensing Bottom Bracket

Imagine have 45+ miles of ultra low traffic roads like this through rolling hills that also connects to a 120 mile loop...
Welcome to the Catalina Foothills of Tucson! — Desert Scorpion

Really, who could have just one?
Happy riding! — Lay's Potato Chips

CA3 is pretty busy with wiring. Adding a 5VDC 5A converter for auxiliary & Lighting.
The — CA3 & Sled

Clear potted 52V 14.9AH Battery is a match for the Phaserunner.
No, they don't make these batteries anymore.
Also the battery master switch is an external SSR unit that mounts inside the battery mount under the boom with an external button. — Potted Pair

The amazing thing is this entire assembly weighs 11 lbs 1 oz. — Battery Close up

Front end assembled. 3D printed Wiring Closet Shroud not shown so its wrapped with cloth. — Front Assembly

Simple heatsink enclosure — Phaserunner Heatsink Mount

Cover plate not shown.
Easy to remove rear tire with easy connector access.
Rarely have to remove tire. :) — Phaserunner mounted

At the business end is a MAC 10T, one of first upgrade units Paul sent me. Before the GMAC.
I have a couple of later ones that saturate at 50A. For some reason this one will see 60A just fine (although I limit it to 30A anymore). It had a little over 5000 miles at time of the V2 battery upgrade so the gears & clutch were swapped inspection revealed very little wear on original. — MAC 10T

Sorry its out of order, but thats the Battery tray with SSR. — Battery Tray

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Desert Scorpion

V2 Build

Grin Tech