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21
General Discussions / Re: Greetings from Iowa!
« Last post by Bikemad on June 06, 2026, 10:31:24 AM »
Hi Harpo andto the forum.

I'm curious as to why you would use a 26" MP5 instead of a 20" MP5.
I suspect that the original frame is capable of accepting the larger diameter rear wheel, but you will probably find that the width of tyre that you'll be able to use will be reduced as it will now be located in a narrower part of the chain stays.

The 20" MP5 is a solid cast wheel that would be much better at resisting the high lateral forces that it would be exposed to when cornering at speed on a non-tilting trike.
Also, being the same diameter as the original wheel it wouldn't decrease the castor angle on the steering by ~3° or raise the Centre of Gravity.

Alan
 
22
General Discussions / Greetings from Iowa!
« Last post by Harpo on June 05, 2026, 10:23:53 PM »
New member here, adding a Magic Pie 5 26" to a TerraTrike Rover along with rear derailleur, replacing 20" with SA internal 8sp.  I've got almost all the parts now, will be starting soon!
23
Electric Boat Conversions / Re: My boat conversion from diesel to el.
« Last post by BjornO on June 04, 2026, 04:43:22 PM »
Now I have tested the updated version in the boat.
It works well - but...
In the F1 position the motor is not running. I have measured the output voltage / propeller RPM as follows:
F4: 3,639 / 576
F3: 3,210 / 379
F2: 2,881 / 177 
F1: 2,545 / 0 ??
N:  2,214 / 0
R1: 1,781 / 153
R2: 1,345 / 270
R3: 0,908 / 389
Note! The propeller RPM is 1/3 of the motor RPM.
24
Electric Boat Conversions / Re: My boat conversion from diesel to el.
« Last post by BjornO on May 30, 2026, 11:56:54 AM »
Now I have tested it and it works. When switched on it beeps, as it is in neutral and the brake signal is active. Rotating clockwise, speed is inreased forward, and counter clockwise reverse.
However, sometimes the beeping does not stop and the motor does not run, when I turn the throttle. Maybe the voltage on the throttle input is outside the limits. I will add the TP3 potentiometer to be able to fine tune the neutral position, but connect it to the N connector instead of the output.
25
Magic Pie & Smart Pie Discussions / Forks for 1000 watt Magic Pie 5? ..
« Last post by diverdon on May 29, 2026, 03:18:33 PM »
   Thinking about upgrading the forks on my Electra Townie 7D ... The motor has been on there for years .. 2 torque arms .. the nuts have only backed off 3 times in all the years .. I'm pretty easy on it .. But .. That lower fork leg sure looks thin .. A fork called the Surly Troll looks like a good fit ... Any suggestions ?
26
Electric Boat Conversions / Re: My boat conversion from diesel to el.
« Last post by BjornO on May 26, 2026, 10:14:42 AM »
I will use this. The brake signal is to make sure the motor does not move when in neutral. I have prepared it so that I can use it with or without separate reverse switch.
27
Electric Boat Conversions / Re: My boat conversion from diesel to el.
« Last post by Bikemad on May 25, 2026, 08:36:23 PM »
As the working throttle voltage range is only 2V in total (1.2 to 3.2V) I don't think diodes will give you many speed options.
I suggest you use resistors as shown below:



According to my calculations, this should give the following signal voltages and corresponding throttle percentages:

Switch Position    Signal Voltage     Throttle Percent
     Neutral                2.20V                        0%
         F1                   2.42V              20% Forward
         F2                   2.62V              41% Forward
         F3                   2.83V              61% Forward
         F4                   3.03V              82% Forward
         F5                   3.24V            100% Forward
         R1                   1.85V              36% Reverse
         R2                   1.49V              73% Reverse
         R3                   1.12V            100% Reverse

The 200k trimpot (TP3) should be preset to give a resistance of approximately 103,000 Ohms between pins 1 & 2, and then readjusted when finally installed to read 2.20V between pins 1 & 2 with the rotary switch disconnected or held between 2 poles with contact open.
The 5k trimpots will need to be set as follows:
Preset TP1 to 3,150 Ohms between pins 1 & 2 (Pin 3 is not used)
Preset TP2 to 2,800 Ohms between pins 1 & 2 (Pin 3 is not used)
If necessary, readjust TP1 with the switch in the Neutral position until the Signal Voltage reads 2.20V relative to the Ground (0V) Wire.

I'm not sure how much the 200k trimpot will affect the Throttle Signal Voltage when the rotary switch is operated, hopefully it won't make much difference and the throttle will work just as expected.
Check that you have a signal voltage of just over 3.2V with the switch in the F5 position, and just below 1.2V with the switch in the R3 position.
You may have to readjust TP1 and TP2 if the Signal Voltage is too low in the F5 position or too high in the R3 position whilst also ensuring that the Signal Voltage in Neutral is still ~2.2V.

Hopefully you'll be able to make it all work as hoped.

Alan
 
28
Magic Pie & Smart Pie Discussions / Re: Throttle only works 1 time.
« Last post by Bikemad on May 23, 2026, 10:00:49 PM »
Hi Luigi

I'm not sure what is causing your problem but it doesn't appear to be a problem with your controller settings or your batteries.

I suggest that you start by temporarily disconnecting both of the brake switch cables by unplugging the connectors and see if the throttle problem still exists.
Check out this thread for a similar problem that was caused by a wire shorting out inside one of the brake switches.

If disconnecting the brake connectors cures your problem then plug them back in one at a time to determine which one is faulty.

If the problem still persists with the brake switches unplugged, it could be an internal short circuit within the main wiring harness, a faulty thumb throttle, or possibly the controller itself.

Try unplugging the brake cables first and let us know what happens.

Alan
 
29
Magic Pie & Smart Pie Discussions / Throttle only works 1 time.
« Last post by Luigi_stef on May 21, 2026, 05:08:34 PM »
Hello,
I have a new golden motor rear with 48V (50V) battery.

There is a problem I don’t understand.
When I start with the thumb throttle everything is going well but when I brake or let loose the throttle and restart, the throttle does not respond anymore.
I then have to turn off the battery wait 3seconds en turn it back on and then the throttle works again until I brake or stop pushing the thumb throttle.
Then same story.
When I’m driving, I can turn on the cruise control button and keep going. Went over 2 km but as soon as I brake the throttle is not responding anymore.

Everything is working fine exept for this.
I turned up and down the Ampsettings but the problem remains.
My log list stay empty.

Can someone help me for a solutions or step guide I can follow to check.
I have 2 battery but same problem with both.
Thank you very much!

Kind regards
30
Electric Boat Conversions / Re: My boat conversion from diesel to el.
« Last post by BjornO on May 21, 2026, 11:00:12 AM »
Now I am working with version 3 of my throttle. The first version failed as the switch is break before make. I will use a parallel circuit with two resistors, 120k to the 5V supply and 100k to GND, giving me 2,2V between the steps. I will also try diodes instead of resistors between the steps, giving me 0,7V space.
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