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Old May 02, 2012, 07:46 PM
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Jack
USA, ME, Ellsworth
Joined May 2008
18,083 Posts
Quote:
Originally Posted by 2400RDR View Post
What a great thread!

I'm a big fan of the of the DT7xx series- I have a quad with DT700 motors that flies really well, and I'm making another with DT750 motors.

Also, I've noticed that HK has DT850 motors available. Anybody tried these, or is there another thread for them?
Is that the D4023-850? We got a thread going on that one a while back:

http://www.rcgroups.com/forums/showthread.php?t=1491875

The motor looks like a great one but there has not been a lot of evolution on developing it's use and/or popularity. It is being mean to me, every time I touch it something stupid happens to take all of the fun out of things...

Quote:
I actually was intending to post so I could ask about a good source for replacement bearings and shafts for these motors, but I did some more browsing in the thread and saw the link pointing to HeadsupRC. Is that still the go-to place for these supplies? C-clips also?

Brushless motors are so cool- with a supply of bearings and shafts, you can pretty much keep them going forever.

Rick
Heads Up is good for shafts and clips when they have what you need, this motor uses the MR74ZZ 4x7x2.5mm (ID x OD x W) bearing which they don't carry.

Here are some sources for it

rcbearings.com - http://www.rcbearings.com/4x7x2-5-mr74zz/

vxb.com - http://www.vxb.com/page/bearings/PROD/4mm/kit7120

An eBay search for "bearing 4 7 2.5" will surface many more hits. These are undersize and overstressed before we do anything stupid even. You can't have too many on hand and you need to lube the bearings before you install them.

On eBay you can usually find the MR74-2RS bearing that has rubber shields on both sides. I like those because they can be filled with lube and it stays in better (I vacuum pack them full). The rubber shields have more drag so it will cost you about 2 RPM for every 10,000 or so. Or maybe 1/10,000ths of a Watt...

Jack

I know metal working and fits and material so I buy shafts from other places (drill blanks for example) when I can't find them anywhere else.
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