My new contraption

[tlandauer]

Travis, I like this, but have a stupid question for everyone, why can there be a device that can "optically" read the rpm of the motor, say if you attach an airplane prop to give a meaningful load and the strobe light will just read the rpm, like an old timer timing gun?
Sorry, I don't mean to muddy up your excellent thread, but I am dying to learn.

Sent from my Droid using Tapatalk 2

[kfxguy]

All the castles read correct?
I have one of these sitting WITH prop and 5mm adapter. Keep meaning too find time to experiment but...

Here's a list to be clear....

Motor that read correctly

Neu 1410
Neu 1521 with 1524 rotor
Castle 1515 2200kv finned version
Castle 1515 2200kv new style non finned
Castle 1518 1800 kv

Motors that read incorrect

Lehner 2240
Neu 1527 1250kv
tp 4060 540kv (yes 540..lol) (btw, the 4060 is about 3/16" shorter than a neu 1527 and the rotor in the tp is a touch longer than the neu 1524 rotor. The rotor build quality on the tp is Suprisingly nice)


When I get home from work tomorrow, I'll try a few more motors.

[jim82]

Here's a list to be clear....

Motor that read correctly

Neu 1410
Neu 1521 with 1524 rotor
Castle 1515 2200kv finned version
Castle 1515 2200kv new style non finned
Castle 1518 1800 kv

Motors that read incorrect

Lehner 2240
Neu 1527 1250kv
tp 4060 540kv (yes 540..lol) (btw, the 4060 is about 3/16" shorter than a neu 1527 and the rotor in the tp is a touch longer than the neu 1524 rotor. The rotor build quality on the tp is Suprisingly nice)


When I get home from work tomorrow, I'll try a few more motors.

damn dude are you rich....lol

[kfxguy]

damn dude are you rich....lol

Heck no! I do lots of trading and picking up good deals when I can on motors and esc's tho!

[runzwithsizorz]

Travis, I like this, but have a stupid question for everyone, why can there be a device that can "optically" read the rpm of the motor, say if you attach an airplane prop to give a meaningful load and the strobe light will just read the rpm, like an old timer timing gun?
Sorry, I don't mean to muddy up your excellent thread, but I am dying to learn.

Sent from my Droid using Tapatalk 2

I don't think Travis, or the mod's would mind, it's not like you're way off topic. I have one of these for my Eagletree system; ----

http://www.eagletreesystems.com/index.php?route=product/product&path=63_69&product_id=64

The Eagletree optical rpm sensor, which I also have, but never used, would require me to glue a dot on the coupler, and mount/aim the sensor at it. Doubt it would be too accurate.

[tlandauer]

I don't think Travis, or the mod's would mind, it's not like you're way off topic. I have one of these for my Eagletree system; ----

http://www.eagletreesystems.com/index.php?route=product/product&path=63_69&product_id=64

The Eagletree optical rpm sensor, which I also have, but never used, would require me to glue a dot on the coupler, and mount/aim the sensor at it. Doubt it would be too accurate.

Thank you sir! and thanks for the info on Eagle Tree, I had completely forgotten about that.

[srislash]

I don't think Travis, or the mod's would mind, it's not like you're way off topic. I have one of these for my Eagletree system; ----

http://www.eagletreesystems.com/index.php?route=product/product&path=63_69&product_id=64

The Eagletree optical rpm sensor, which I also have, but never used, would require me to glue a dot on the coupler, and mount/aim the sensor at it. Doubt it would be too accurate.

Or better yet, I have the 'hall effects' sensor in the Fantasm and I have found it pretty good as long as set up correctly.

[kfxguy]

So I'm convinced. Last night the 1521 read fine. No changes, it read 1400kv. Then I checked another 1521 neu 1500kv, checked it, it said 3000kv. Wtf?

[Make-a-Wake]

Heya Carl', not doin' too bad. As well as can be expected from a cyborg anyway ...

I had 19t speed gems arconites on 3s w/ 447's in a villain & that was a chittin' & a gettin' lil' setup I liked. I put another one together with E-Savage motors (14.4v gt-550's) on 4s & it was really respectable, but I'm curious to see what it does with these platinum Millz that I picked up. I dont think it would come close to 60k under load w/ the 2:1 gear drive & the motors in parallel on a single 4s ??...

Yeah but you are still pumping 4s to the motors, if you run the motors in SERIES it will be like 2s to each motor.

[boatbandit2]

Anyone have any experience buying from these people?

I did Travis for my Rc heli and it took months I mean months to arrive and endless emails.

[kfxguy]

I did Travis for my Rc heli and it took months I mean months to arrive and endless emails.

Well that's enough for me to not buy from them

[TheShaughnessy]

you know you could always get an eagle tree system with the brushless rpm sensor and run it in live mode right there on your bench next to your cpu.
If you really wanted you could build a lil motor mount attach airplane prop. a 5x5 apc (might have been a 6x5)was pulling about 60ish amps on a 1515 1y i was messing around with. I was more trying to look at voltage sag then rpm at that time though. I would say you don't want to be t0o close to the prop, it flexes quite a bit, makes an terrible noise, and I always had a fear of the prop exploding. That didn't happen to me but I'd imagine it could if you ramp the rpm up high enough.

[runzwithsizorz]

you know you could always get an eagle tree system with the brushless rpm sensor and run it in live mode right there on your bench next to your cpu.
If you really wanted you could build a lil motor mount attach airplane prop. a 5x5 apc (might have been a 6x5)was pulling about 60ish amps on a 1515 1y i was messing around with. I was more trying to look at voltage sag then rpm at that time though. I would say you don't want to be t0o close to the prop, it flexes quite a bit, makes an terrible noise, and I always had a fear of the prop exploding. That didn't happen to me but I'd imagine it could if you ramp the rpm up high enough.

All true, HOWEVER, Travis has created an inexpensive *bench* tester, and something I would love to have. It also appears that the commercial device is discontinued, or VERY hard to find. My Eagletree serves me well on the lake, but to move it, and set it up on a bench would be a real pain. I want it just where it is! Perhaps it is the addition of a piece of hardware, or maybe a mathematical equation. I do not know, which makes this thread so intriguing to me. Travis, you have set sail a mystery ship, and I am on board. Ride captain, ride!

[TheShaughnessy]

I would agree that what he has is awesome, if it was providing accurate results. My logger is just installed with a piece of Velcro, I usually pull it out to download the data. You can get a second rpm sensor for under 15 bucks. I have my esc's tapped with male servo leads and a female on the sensor so I can move from boat to boat easily or change motors without having to mess with the sensor. Besides I bet Travis could find plenty of other uses for the data logger, you can even convert it to handle 300 amps

[kfxguy]

All true, HOWEVER, Travis has created an inexpensive *bench* tester, and something I would love to have. It also appears that the commercial device is discontinued, or VERY hard to find. My Eagletree serves me well on the lake, but to move it, and set it up on a bench would be a real pain. I want it just where it is! Perhaps it is the addition of a piece of hardware, or maybe a mathematical equation. I do not know, which makes this thread so intriguing to me. Travis, you have set sail a mystery ship, and I am on board. Ride captain, ride!

Thanks man!

It isn't wanting to cooperate or be a accurate at the moment. I think i got a defective unit. It will read correctly sometimes and then I'll try again the next day, same motor, same battery..everything. then it will read erratic. Maybe my esc is messed up. I'm going to try a different esc in a few minutes. BUT....it has come in very handy when checking motors very quickly and easily. I have a few motors in a box that was given to me and I didn't know if they worked. Because I put leads with alligator clips on, I was able to quickly test them. That right there was worth it to me. I didn't have to solder the right bullets on an esc to test them. Stay tuned, I'm going to try another esc and if that does not work, I may order another unit and try my luck again.