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RC... but not RC

#1
Hiya all,

Didn't know where to post this so I'm doing it here.

I just had the great idea of mounting a huge motor and propeller to my bicycle. It would be loud, very pointless, and would include a high risk of finger removal.

Is it possible to control an ESC with some kind of little knob? A PWM generator I guess?
 
#4
I use servo testers for testing esc's all the time...

Need one of those cages fans used to have (you know, the old metal blade ones that would take a finger off! Lol)
Cheers! I’ll try a cheap servo tester. Now all I need is a huge 8S battery, a very large motor, and hmm... let’s say 40” wooden prop XD
 
#7
120mm is usually around top end, though it looks like you found larger. though given the use, prop might be more effective in terms of power/not killing your batteries at that scale.
Yeah, I have two options for this build.
Either a huge motor mounted on the handlebars/front wheel with a big carbon fibre prop (incurring a large risk of finger removal) OR:
I could mount a couple of 70mm edfs under the seat. This is probably a safer option, but I don’t know if it would be able to produce enough thrust.
Which one would work better?
 

b-29er

Well-known member
#8
i would advise neither of these options lol. The prop option, as you said, can remove fingers, but the edf option could wind up with a catistrophic failure that could shoot plastic into your seat and beyond. Theres been guys on RCG who have lost/nearly lost eyes while doing bench testing on 90mm units, so probably should consider them in the same realm of danger as a propeller for different reasons.

My advice would be if you want to do something like this, put the motors on a cargo rack. that way everything is safely behind you and out of prop arc.if you are looking for performance, go with a propeller with a cage. If you're just looking to make noise, go EDF.

Alternatively, if you're just trying to make an e-bike, you can get a kit on ebay pretty cheap and retrofit your bike...might save you a finger or two.
 
#9
i would advise neither of these options lol. The prop option, as you said, can remove fingers, but the edf option could wind up with a catistrophic failure that could shoot plastic into your seat and beyond. Theres been guys on RCG who have lost/nearly lost eyes while doing bench testing on 90mm units, so probably should consider them in the same realm of danger as a propeller for different reasons.

My advice would be if you want to do something like this, put the motors on a cargo rack. that way everything is safely behind you and out of prop arc.if you are looking for performance, go with a propeller with a cage. If you're just looking to make noise, go EDF.

Alternatively, if you're just trying to make an e-bike, you can get a kit on ebay pretty cheap and retrofit your bike...might save you a finger or two.
I think I will go for EDFs on a cargo rack then ;)
The aim of this project is to spend £50 and then roar around the common (even if the motors produce no thrust) making an almighty noise. Don't even ask why.
 

b-29er

Well-known member
#10
Just a potentially cheaper compromise here, you may look at some of the BDFs that mid7nigh was using on the b-52, which is just a fairly cheap multirotor motor with a 5" prop in a 3d printed shroud. would make more noise, more thrust at lower pitch speed and cost less.
 

LitterBug

Troll Spammer
#11
I think I will go for EDFs on a cargo rack then ;)
The aim of this project is to spend £50 and then roar around the common (even if the motors produce no thrust) making an almighty noise. Don't even ask why.
Hmmmmm..... every time a car with a fart can goes by, it would be nice to spool up a big turbine and afterburner.... LOL.
 

CrazyFastFlying

Well-known member
#12