Amateur Ds Junkies - Page 14 - RC Groups
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Jul 01, 2008, 03:54 PM
Registered User
quadshot's Avatar
Hey Gotsa, I hear ya. In the last video, I thought thought the bungee was going to pull him on his ass and the palne was going to launch into who knows where.

You know that has had to happen. Were are the funny bungee videos?
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Jul 02, 2008, 02:09 AM
Registered User
Hey kids !!

Just a FYI....I just ordered my Moth and a blackjack switch tonight.....I am excited....!!!!

If you all have any tips about what servos to use construction tips let me know before I start building this Moth.....Thanks

I like the half-pipe.....James did you have a half pipe??

Jul 02, 2008, 02:21 AM
Registered User
quadshot's Avatar
Dave that is awesome. You won't be disappointed with the moth. No question about the servos. Hitec 85MG's. Perfect size and you need the tough metal gears to handle the speed and crashes. Anything less and you will be disappointed (as I have been trying other servos).

Sounds like I need to get my order in for a new moth, since I won't be able to keep up with you with my well used edition.
Jul 02, 2008, 02:30 AM
I'd Rather Fly
Alex May's Avatar
Dave, make sure you put in a ballast kit (you can order one from NCFM). It doesn't add a whole lot of weight and it's on the CG anyways so it doesn't make a huge difference... but you'll appreciate it when you go to a site with big lift (like Blossom) and want to be able to haul ass.

I know my ballast tube will be getting a lot of use this coming winter at blossom, when the winds can be super strong and the lift big.
Jul 02, 2008, 02:46 PM
Registered User
Thanks for the tips on the servos and the ballast....Yes Alex I was looking at purchasing the ballast kit..I will go back and check it out.

Jul 02, 2008, 03:54 PM
I would use Hitec HS65mg's before I used HS85's. They're smaller, silky smooth, but have more power, and WAY better centering and holding power.

The Moth elevons has like 1/16" up and 1/16" down travel, really short throws for elevator (no room for double centering or soft center holding power). The HS65mg has killer centering and IMO is a better choice.

I've compared both side by side. The HS65mg is a total gem.
Jul 02, 2008, 04:26 PM
Registered User
Daemon's Avatar
The HS-65MG is definitely a nice servo, but not more powerful than the 85MG.
We're talking 25-30oz of torque versus 41-48oz.

For my next Moth, I think I'll try the Hyperion Atlas HP-DS13TMB
(roughly same dimensions as 85MG). Some relevant specs.
Hyperion ATlas HP-DS13TMB Metal gear, digital, programmable, top ball bearing
Dynamic torque 3.6/4.2 kgf*cm or 50/58 ozf*in
Holding torque 7.2/8.4 kgf*cm or 100/116 ozf*in

I'm using the smaller DS11AMB programmed to swing through 180 degrees
for my camera plane, and it's still got incredibly high resolution and precise
centering. I've been very impressed with them so far.

Jul 02, 2008, 09:33 PM
I'd Rather Fly
Alex May's Avatar
The other thing that we should bring to mind is cost efficiency. How much are those Hyperion digitals that you speak of?

I know HS-85MG's are about $30 a pop while the HS-65MG's are about $35. The slightly smaller size and weight of the 65MG are not worth the $5 increase in size, not to mention a slower and weaker servo like Daemon mentioned.
Jul 02, 2008, 11:35 PM
Registered DSer
Kahnx's Avatar

I'd be very interested in hearing your experience with the Hyperion HP-DS13TMB's - I just bought a few to put into my new Zipper plank with the hope of getting the very fine resolution that is needed, and hopefully more than HS-85's.

Out of the box, they certainly seem to be the goods. No slop. I cycled them back and forth repeatedly for about a minute to see if they'd heat up - barely got warm (more so from me holding them than motor heat, methinks).


Jul 03, 2008, 12:23 AM
I'd Rather Fly
Alex May's Avatar
If these get good reports they may just be worth that extra bit of money.
Jul 03, 2008, 01:36 AM
Objects in mirror are losing
1000MPH's Avatar
Allerc is a great little business out of AZ with fast free shipping over $100.
Jul 03, 2008, 11:27 AM
Terry Harner AREA-52
The End's Avatar
On my Moth I used 85MGs, and what I did was sink a small servo screw just in front of the elevon and then attached a small rubber band over to the servo arm. It basically keeps a small load on the servo and removes the slop.

I also use servo covers that cover the arm too so the whole deal doesn't get jacked up from landing etc..
Jul 03, 2008, 12:49 PM
I'd Rather Fly
Alex May's Avatar
That sounds like an interesting idea.

Anyone planning on going out to Poway this weekend? I'll be busy with family on the 4th but Saturday and/or Sunday should be free. Getting a new receiver for my Moth today and hoping that fixes my problems.
Jul 03, 2008, 04:32 PM
San Diego North County
I also used 85MG's on my Moth. I put the servos in from the bottom with the arms coming out the top. They stick up only a little bit and don't get jacked on landings. I have had it for over two year and have had no servo problems at all.