Espritmodel.com Telemetry Radio
Reply
Thread Tools
This thread is privately moderated by mikefromgermany, who may elect to delete unwanted replies.
Old Jan 10, 2013, 05:37 PM
Ain't crashing often anymore
mikefromgermany's Avatar
Germany, Berlin
Joined Jun 2012
3,180 Posts
Mini-HowTo
9116 Direct Drive Tail

9116 Direct Drive Tail


The search is over!
Finally, after 1 month intensive testing with two 9116 I'm able to present you a solution for fast dying tail motors:

The Direct Drive Tail Unit of a ESKY Honey Bee CP3

It improves the behavior noticeably, you will get MUCH more tail authority, you'll notice when flying FF right turns where the stock tail doesn't do much.

It is no real plug and play mod, but manageable even for the unexperienced.

You'll need:
  • an old stock tail unit
  • Esky Honey Bee CP3 Tail Motor 002445 3.84 $
  • Esky Honey Bee CP3 CPX CT RC Tail Blade Set Black 002386 1.19$
  • Esky Honey Bee CP3 CPX RC Tail Motor Heat-Sink 002447 2.00$ (You'll not need it - the motor barely gets warm in a 9116. But for optics)
Total - including shipping: 5.03 $ (at banggood, without heat sink)


Tools: Soldering iron, a little hacksaw, exacto knife.

Now the fun begins:

You have to mod the old stock motor holder according to the picture. Just cut everything away but the motor "cup".
As the original stock tail motor has flat sides, and the new motor is round you may take a Dremel and a fitting cutting head to the inside of the motor mount and make it round to get a perfect fit. (thanks to eagle-eyed Steve!)
But it works well enough without such perfectionism.



Solder the cables of the old OEM tail motor to the new motor.


Put the motor in the modded holder, fasten with the supplied screws and add the tail prop.

Reassemble the tail and mount it to the 9116.


Now you may have to get the bird back in balance, levelling the swash again and have to set the tail subtrim in the TX to something ~100L or the tail will overpower the stock main motor by far.

READY!

Durability:
This mod runs in one bird for ~80 flights now, has survived a second main motor and still is set to 105L
The second bird has 30 flights with this mod and it runs still as new (110 L subtrim).
Edit 4th of July '13:
Bird 1: over 200 flights, still strong as new.
Bird 2: n/a any more -sold it

Credits:
Thanks to Zamjustice, who first installed the upper kit with good results and posted it Oct 23, 2012 here. He made me try it, too.
Thanks to Balr14, who promoted the idea of a DD tail for the 9116 since Mar, 2012 (as I can remember) and defined it Jun 22, 2012 here.

Have fun!
-mike-
mikefromgermany is offline Find More Posts by mikefromgermany
RCG Plus Member
Last edited by mikefromgermany; Jul 26, 2013 at 01:54 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 10, 2013, 06:19 PM
Fly Fast, Fly Hard, Fly Fun
rexless's Avatar
Canada, BC
Joined Apr 2012
1,433 Posts
Wow - Thanks for posting this article! You lay it out so well. I am very tempted to give this a try.
rexless is offline Find More Posts by rexless
RCG Plus Member
Old Jan 10, 2013, 07:25 PM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
3,703 Posts
[ UPDATE ]

Here is the kit installed on my highly modded 9116.

9116 Direct Drive HB Tail Upgrade Testing on Spindle.mpg (0 min 21 sec)


Here is an in flight video, showing head holding performance.
I only used rudder slightly on takeoff, and during the spin.

Double Horse 9116 with Honey Bee Direct Drive Tail.mpg (1 min 14 sec)


______________________________________________

For you guys in the U.S. here is a great link.

Ordered 1 motor and 2 blade kits shipped to my door for under $7.00.

You can use PayPal !

I didn't have to put in any info or anything.
I literally ordered these in under one minute.

Here is the motor:

http://www.banggood.com/Wholesale-Es...5-p-51343.html

And here is the blade kit:

http://www.banggood.com/Wholesale-Es...6-p-50976.html

Easiest buy EVER.
Steve_ is offline Find More Posts by Steve_
RCG Plus Member
Last edited by Steve_; Feb 02, 2013 at 11:55 PM.
Reply With Quote
Old Jan 10, 2013, 07:30 PM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
3,703 Posts
Update, The FX059 tail motor has also turned out to be a great solution.

It's longer than the 9116 motor, and has cooling vents.
It's also cheaper than any other motor, under $3 each in lots of 3.

Although it bolts right in, the pinion may not line up, and it can be
tricky to install. I believe there is information about this in my blog.

Search Banggood for FX059.
___________________________________________

Great work Mike, Balr14, Zamjustice, and everyone else involved.
You have done a great service for your fellow 9116-ers.

This looks the THE mod to do for peace of mind.
The motor I was pushing (S031 Tail motor) works fine, but this will last
much longer, and costs one dollar more.

Some other reasons to use this tail drive:

1) Lower rotating mass, allowing for quicker response and easier flying.
2) The direct drive allows lower motor RPM, giving longer bushing and brush life.
3) No gears to break or incorrectly mesh, and elimination of gear whine.
4) Elimination of the cheap plastic tail shaft bushings.
5) More efficient due to lower friction (no gear mesh or shaft bushings)

For those of you who don't want to modify your tail, or are just plain chicken,
there is another solution that has worked decent for me.
The tail motor from a Syma S031 has slightly more thrust than the stock unit,
has a slightly shorter lifespan, and costs $3.40.
You have to unsolder the included wires, and solder on the stock tail wires,
but other than that it is plug and play, no cutting or modifying anything.

It looks like the WL Toys V912 has a larger tail motor that might possibly
bolt right in as well. I found it for under $4 at Banggood.

http://www.banggood.com/Wholesale-Wl...1-p-60705.html

In either case, Mike's DD tail motor is a much better solution, and will last MUCH longer.
Steve_ is offline Find More Posts by Steve_
RCG Plus Member
Last edited by Steve_; Jun 13, 2013 at 04:11 PM.
Reply With Quote
Old Jan 11, 2013, 01:18 AM
Registered User
United States, NY, Kings County
Joined Jan 2013
22 Posts
First post here Hello all!.

What tool you use to trim and cut the motor tail motor holder?
SpeedRacerXX is offline Find More Posts by SpeedRacerXX
Reply With Quote
Old Jan 11, 2013, 01:21 AM
Ain't crashing often anymore
mikefromgermany's Avatar
Germany, Berlin
Joined Jun 2012
3,180 Posts
Quote:
Originally Posted by SpeedRacerXX View Post
First post here Hello all!.

What tool you use to trim and cut the motor tail motor holder?
You can take whatever comes in handy.
A hacksaw, x-acto knifes, a Dremel equipped with a plastic cutting head (that's what I used)

-mike-
mikefromgermany is offline Find More Posts by mikefromgermany
RCG Plus Member
Old Jan 11, 2013, 06:21 AM
Just a 9116 flyer.
Rajah235's Avatar
Australia, NSW, Wollongong
Joined Dec 2012
613 Posts
Looks really good, Mike.

Have duly ordered the nec parts.

Thanks.
Rajah235 is offline Find More Posts by Rajah235
Reply With Quote
Old Jan 11, 2013, 02:35 PM
Registered User
Joined Nov 2012
150 Posts
Thank you, mikefromgermany!
aphex4000 is online now Find More Posts by aphex4000
Reply With Quote
Old Jan 12, 2013, 12:31 AM
Registered User
Joined Nov 2012
150 Posts
I ordered the parts needed to complete this conversion and had a thought about trimming the motor. Would it make sense for me to get an Xtreme 180 motor to replacing the main and trim it back since this tail might be able to keep up, or is that still a bad idea?
aphex4000 is online now Find More Posts by aphex4000
Reply With Quote
Old Jan 12, 2013, 12:50 AM
Ain't crashing often anymore
mikefromgermany's Avatar
Germany, Berlin
Joined Jun 2012
3,180 Posts
Quote:
Originally Posted by aphex4000 View Post
I ordered the parts needed to complete this conversion and had a thought about trimming the motor. Would it make sense for me to get an Xtreme 180 motor to replacing the main and trim it back since this tail might be able to keep up, or is that still a bad idea?
I had a thought of it, too.
This direct drive is so powerful it will hold the tail without question (just look at the subtrims needed to tame it down for a stock motor...).

There are some cons adding a Xtreme motor:
- the 9116 is a cheap bird - so 12 USD for a main motor that needs a regular brushes exchange is quite over the top....
- You have to change too much - blades, rotor head according to blades, flybar, etc.. makes no sense going too deep into that. (see following point)
- the whole bird is outdated, better get something newer but only IF it has to be a ~200 size 4CH FP maybe a V912 would be the better base.

But it is up to you, this hobby has nothing to do with being reasonable - it is about having fun!

I will not take further steps in the whole 9116 modding, I'll just provide any help for those who could not have been talked off to buy a DH9116 and want to stay as stock as possible.

-mike-
BTW - just seen your printed chassis - niiice! You have a 3D-printer for prototyping it?
mikefromgermany is offline Find More Posts by mikefromgermany
RCG Plus Member
Old Jan 12, 2013, 05:58 PM
Registered User
United States, NY, Kings County
Joined Jan 2013
22 Posts
Well I just got my First 9116 i went to take it for it's first flight ever! and the tail motor came DOA... I order the parts to this Mod. Ty for all the info you guys posted.
SpeedRacerXX is offline Find More Posts by SpeedRacerXX
Reply With Quote
Old Jan 13, 2013, 12:10 PM
Registered User
Joined Nov 2012
150 Posts
Quote:
Originally Posted by mikefromgermany View Post
I had a thought of it, too.
This direct drive is so powerful it will hold the tail without question (just look at the subtrims needed to tame it down for a stock motor...).

There are some cons adding a Xtreme motor:
- the 9116 is a cheap bird - so 12 USD for a main motor that needs a regular brushes exchange is quite over the top....
- You have to change too much - blades, rotor head according to blades, flybar, etc.. makes no sense going too deep into that. (see following point)
- the whole bird is outdated, better get something newer but only IF it has to be a ~200 size 4CH FP maybe a V912 would be the better base.

But it is up to you, this hobby has nothing to do with being reasonable - it is about having fun!

I will not take further steps in the whole 9116 modding, I'll just provide any help for those who could not have been talked off to buy a DH9116 and want to stay as stock as possible.

-mike-
BTW - just seen your printed chassis - niiice! You have a 3D-printer for prototyping it?
Oh darn, I see your point. Going with the Xtreme 180 just becomes too much of a financial investment, while a direct drive conversion offers a lot of reliability for very little cost. I'll stick with the factory motor and just replace as needed.

I shipped the chassis design off to a printing service since I was already having some other parts made up for an automotive project. It should be at least another week before the parts get here but I'll be sure to post pictures when it does.
aphex4000 is online now Find More Posts by aphex4000
Reply With Quote
Old Jan 13, 2013, 01:37 PM
Ain't crashing often anymore
mikefromgermany's Avatar
Germany, Berlin
Joined Jun 2012
3,180 Posts
Can't wait to see this plate - please post it in the new 9116-Thread
-mike-
mikefromgermany is offline Find More Posts by mikefromgermany
RCG Plus Member
Old Jan 13, 2013, 05:41 PM
Registered User
Joined Nov 2012
150 Posts
Quote:
Originally Posted by mikefromgermany View Post
Can't wait to see this plate - please post it in the new 9116-Thread
-mike-
Will do!
aphex4000 is online now Find More Posts by aphex4000
Reply With Quote
Old Jan 14, 2013, 09:47 PM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
3,703 Posts
Quote:
Originally Posted by mikefromgermany View Post
Can't wait to see this plate - please post it in the new 9116-Thread
-mike-
x2
Steve_ is offline Find More Posts by Steve_
RCG Plus Member
Latest blog entry: Blade 400 Upgrades
Reply With Quote
Reply

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
For Sale Direct drive tail conversion for HB FP, CP and similar 10$ ihor14448 Aircraft - Electric - Helis (FS/W) 0 Dec 11, 2012 12:42 PM
Discussion Direct Drive Tail upgrade and heli spinning out of control. Hierlevelz Electric Heli Talk 12 May 11, 2012 05:23 PM
Discussion Helis with direct drive tail gearing freezywilly Micro Helis 6 Apr 21, 2012 02:14 PM
Discussion Helis with direct drive tail gearing freezywilly Micro Helis 0 Apr 21, 2012 09:54 AM
Dragonfly with direct drive of geared tail drive? Wilders GWS (Grand Wing Servo) 1 Nov 13, 2004 07:18 PM