Big lama battery compartment - minor modification.

platinum · Last edited by platinum on Sat Jun 25, 2011 8:53 pm; edited 1 time in total

Many big lama owners were unsatisfied with the battery security it fell out while flying so do I.
We can use velcro tape to hold but I also want to use my stock 950 mAh batteries which a little bit thicker too.
So I added 4 thin washers to the skid mouting.

platinum
_________________
/Goal : relaxed flying with the least fixing.

It snug fit for 950 mAh battery.

Use wooden sheet shim for original 800 mAh battery.

pjdog · Posted: Sun Jun 12, 2011 7:45 pm Post subject:

I had a Big lama. The battery fell out while flying. So I bought a set of 'Super Skids' with the optional battery tray. Solved the problem.

Jack

tombo242 · Posted: Sun Jun 12, 2011 7:52 pm Post subject:

Of course you can just strap a big battery to a velcro pad underneath the normal box. Check the CG though and this vid of mine.

Link

Yup - that's me and "Big Jock" too!

Tom.

pjdog · Posted: Sun Jun 12, 2011 10:44 pm Post subject:

Nice Lama.

Looks like a killer.

platinum · Posted: Mon Jun 13, 2011 5:45 am Post subject:

Nice video. Let's know about that. Thanks for sharing.

platinum

tombo242 · Posted: Tue Jun 14, 2011 3:37 am Post subject:

platinum · Posted: Tue Jun 14, 2011 7:53 pm Post subject:

tombo242 · Posted: Tue Jun 14, 2011 9:47 pm Post subject:

platinum · Posted: Wed Jun 15, 2011 5:58 am Post subject:

Hi Tom,
Thank so much for your superb illustration . ...(A Tombo production).
Have a good time.

platinum
_________________
/Goal : relaxed flying with the least fixing. Very Happy

tombo242 · Posted: Wed Jun 15, 2011 5:01 pm Post subject:

St Bosse · Hopping Maniac Joined: 06 Sep 2011 Posts: 24 Location: RSA

Hi tombo242,

Sorry for this late posting but I only started heli flying a week or three ago and only came past your posting today.

Nice video!

Question:- Are you using the standard stock motors? Lots are written about conversion to brush-less. Being aware of a possible nasty temp cut-out, I continuously check my motor temperature. So far even after a 10 min flight, quite acceptable temp. And secondly, the cost doesn't really justify the conversion. (The BL costs about $90 more here in South Africa!). I would rather put the money towards the next level, i.e. CP type of heli.

What I did notice though after a nasty unexplainable crash, while checking the motors and electrics, was that the one motor in its unmounted state was screaming a lot. (My BL is still very young in run time). I then realized that the advice I'm getting about the signs on when the motors are nearing end-of-life, being funny noises actually points to the fact that one should service the motors periodically by oiling the two end bushes with a tiny drop of thin oil. Apparently they pack up due to bush(bearing) failure.

pjdog · Posted: Wed Sep 07, 2011 7:51 pm Post subject:

St Bosse:

I found that the motors failed at the bearing gear end. That's the end I oiled. Oiling the brush end will cause you trouble. The oil will set up a resistance on the commutator and that will generate more heat and that will reduce the life of the motors. I know this from experience. I had to replace the motors twice in my Big Lama.

If you do oil the brushed end of your motors just a smidgen of oil. then wipe up right away.

Jack

St Bosse · Hopping Maniac Joined: 06 Sep 2011 Posts: 24 Location: RSA

Jack,

I agree. I was also worried about oil on the brush side but did exactly as per your recommendation. The opposite side (gear side), is where all the stresses and side torques on the shaft been happening. I think that oil on this side need also be a tiny little drop periodically and NOT one big drop until it's noisy again. Oil might creep through to the brushes.

Thanks for the response.

pjdog · Posted: Wed Sep 07, 2011 11:31 pm Post subject:

St Bosse:

Every motor I lost on the Big Lama was down on the pinion gear end. The bearing just crapped out. Even with oil before every flight. This would be a great canidate for a ball bearing replacement. Those stock oil lite bearings just can't take it.

Jack

tombo242 · Posted: Thu Sep 08, 2011 7:40 pm Post subject: