Hacker 20-20L knock???? - RC Groups
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May 07, 2005, 08:35 PM
Space Coast USA
hoppy's Avatar

Hacker 20-20L knock????

Hmmmmmmmm, my 20-20L has a knock - at low speeds it has a definite knock knock knock like a piece of cardboard hitting the spokes of bicycle wheel. Other than that it runs well. Can't hear it by spinning the motor free hand...it only is noticeable with the power on.
Any comments?

With a 10x4.7 GWS SF, it draws a little over 19A at full throttle from a PQ 3s1500. Only takes 1/2 throttle to fly the 23oz Decathlon.
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May 07, 2005, 11:14 PM
Registered User
RickC2009's Avatar
What speed controller are you using?
May 07, 2005, 11:21 PM
Space Coast USA
hoppy's Avatar
CC25 V1.10

I can't give you the parameters because it won't let me access the info without upgrading to 1.2 or whatever.
May 07, 2005, 11:23 PM
Blew out my flip flop
David Hogue's Avatar
Ive seen this recently with a couple outrunners on castle escs...I am curious about it, but dont have the answers for you.

May 08, 2005, 12:23 AM
Registered User
RickC2009's Avatar
I saw another post saying the CC doesn't work well with the hackers. I would try another speed controller just to see.
May 08, 2005, 01:00 AM
Good Better Best quest.
olmod's Avatar


try a hd prop i believe and ive heard slow fly props make some weird noises at revs.
May 08, 2005, 12:26 PM
Space Coast USA
hoppy's Avatar
Did a little more listening and spinning and unfortunately, it is in the motor.... At one location in a 360 degree spin, the click is very noticable. Something is making hard enough contact to make a very audible metallic clank. Time to call Hacker....

Sounds like a loose magnet....
Last edited by hoppy; May 08, 2005 at 04:23 PM.
May 20, 2005, 10:11 PM
Space Coast USA
hoppy's Avatar
Hacker says one of the magnets had moved - sending a replacement.
May 20, 2005, 10:23 PM
Plane dodger
KillerAir's Avatar

Did you ever get to fly it?

May 20, 2005, 11:41 PM
Suspended Account
scratchandbash's Avatar
Should be the last motor brand I'd expect that to happen too. I guess I'll stay with the cheapies.
Jul 18, 2005, 09:43 AM
Space Coast USA
hoppy's Avatar
Originally Posted by scratchandbash
Should be the last motor brand I'd expect that to happen too. I guess I'll stay with the cheapies.

It is a cheapie

The motor is GREAT!! I'd buy another one in a flash.

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