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Hirobo Lama SA-315 Electric Conversion

FloridaHeli

Veteran

jacksonville, florida

Rick,

Nice video. Sounds a lot like my eLama. The scratch built tank and frame is awesome. Is the frame metal or plastic?

What does your Lama weigh flight ready?

Like the servo mounts. Real thinking out of the box. Moving them really cleans up the cabin.

I'm going to look at moving my batteries to the cabin. Great idea.

Thanks for sharing.

Tom

This hobby is WAY too expensive!!

06-21-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

Hi Rick,

Agree with Tom, very nice fabrication and ingenious thinking on the alternate servo and battery mounting layout.

How did you make the dummy tanks?

Jack

06-22-2011 Over year old.
R.J.

Veteran

SF bay area, CA USA

The frame is made from K&S aluminum tubing with wood dowels glued at the ends, cut the ends at the miter angle, and joined by gluing in a bent paperclip at the appropriate angle. The tanks are vacuum formed .020" PETG over a carved balsa plug which was then removed.


My Lama flying weight is 8.5 lbs, draws about 17-18 amps average on a little Hacker A30 12XL 770kv motor, and I fly 8-9 min. with reserve on 6S (two 3S) 4000mah 10C Lipo packs.

Regards,
Rick

06-22-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

Neat idea with the dowels inside the aluminum rods Rick. Did you carve the balsa plugs and vacuform them yourself?

Thanks

Jack

06-22-2011 Over year old.
R.J.

Veteran

SF bay area, CA USA

Yes, just bought some balsa and started sanding. I didn't bother to seal the balsa or anything, just vacuumform over them. Balsa is easier than foam because it doesn't melt when you put the hot plastic over it. After the plastic cools, I removed the balsa plug and sanded the outside of the tank and filled any defects, then painted on the outside to eliminate seeing any of the balsa grain. The dummy tanks are screwed to the diagonal frame tube and the top plywood piece. The whole frame and tank assembly is held on with 3 neodymium magnets.

PS, There is an article about vacuumforming in the latest issue of Model Aviation you may find interesting.

Regards,
Rick

06-22-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

Thanks for all the info Rick. Some very impressive modeling skills!

Amazingly low current draw on yours too. I've got the Hacker C50-19XL on my eShuttle weighing just over 8 lbs averaging 20-21 amps, never breaks a sweat. Very efficient motors. Wanted to put one on my Lama but just wasn't satisfied with how I was going to have to install it.
BellBloke had one on his, however, and it worked out very nicely.

Don't know if you've seen my video or not: http://www.youtube.com/watch?v=EWboR6TjJvU

Best,

Jack

06-23-2011 Over year old.
R.J.

Veteran

SF bay area, CA USA

Jack,

I like the 3-blade look and the slow spool up. Nice large lots in your area. Must be nice to be able to step outside for a quick flight.

Regards,
Rick

06-23-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

Hi Rick,

The slow spool up and reduced start shock to the drive train is a plus. However, the reduced maintenance and drag of a straight pinion to gear setup lie yours would be really nice. Did you take that pinion from the stock Hirobo clutch bell and machine it?

Fortunately, I have a very nice next door neighbor. To be honest, I hardly ever flew back there with glow, for obvious reasons. The quiet, ease of starting, lack of mess and maintenance and cool sound were my main reasons for going electric, as I'm sure they are for most.

Jack

06-23-2011 Over year old.
R.J.

Veteran

SF bay area, CA USA

Hi Jack,

I used a Mikado module 1 pinion on a longer 5mm motor shaft made from a reamer blank. Uses the stock gear ratio and upper bearing support from start shaft bearing block.

If I see too many more nice 3 bladed Lamas like yours, I may have to think about a motor upgrade and installing my MRBIII head!

Regards,
Rick

06-24-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

Hi Rick,

Nice mod on the motor/drivetrain! Hardly a day goes by that I don't learn something new. I'll definitely file that away for future reference.

Truly, the 3 blade head really transforms this heli. It is surely worth the upgrade. I have my Quick UK 3 blade tail rotor, pitch slider, and 75 mm carbon blades on the way. After that, and a few graphics eventually, I think it'll be complete, hah!

Best

Jack

06-24-2011 Over year old.
fireblade48

Senior Heliman

Stutgart, Germany

New pictures

Hey guys some new pictures of some helis and panes I fly.

06-28-2011 Over year old.
csc

Senior Heliman

Phoenix, AZ

Hey guys,

Got some good news... I emailed Century about their discontinued 3 blade tail rotor to see if they had any plans of producing it again?

Here is their response...
Hello,

Yes we plan on making this in the future. It has temporarily stopped production.
Don't know when but it's nice to know it will be back in production.

______________________
eShuttles

07-01-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

To All,

On that note, just received my 3 blade tail, slider, and blades from Quick UK this afternoon.

The grip assembly and tail slider are very smooth operating and definitely appear to be up to the rigors of the task at hand. Beautiful finish to everything, all metal except for the ball links too. I checked for security on all the bolts and screws and everything was locked down very nicely.

My only disappointment is the 2 pair of 75mm carbon NHP blades. They have, for me, too wide of a chord for scale appearances. Perfect length for the application though. I am very carefully going to try to make maybe 5 or 6 mil off the chord to get them the way I want. I hope that goes well :-) They are shown compared to the stock Lama blades, don't want them that narrow, somewhere in between.

Best,

Jack

07-01-2011 Over year old.
csc

Senior Heliman

Phoenix, AZ

Thanks for posting Jack, nice to have options. Looks like a nice setup. I can't tell from the pics, are the blade holders metal? They look plastic.

______________________
eShuttles

07-01-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

CSC,

To tell you the truth, when I first saw them in the bag, I thought they were plastic as well. They are in fact flat black anodized aluminum. The assy. is light but definitely feels substantial.

Replaced the stock Hirobo links with Rocket City links on the upper push rods this morning. These are more robust plus have a smooth, secure feel on the balls. I have had a Hirobo link crack for no good reason, so I use these everywhere. Cheap insurance.

Regards

Jack

07-01-2011 Over year old.
csc

Senior Heliman

Phoenix, AZ

Looks good Jack. Thanks for clearing the metal vs plastic issue up for me.

______________________
eShuttles

07-01-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

Hmmm.

On with the tail rotor install, Snag #1

The brass bushing inside the slider was not opened up enough on the side facing in to allow it to go onto the tailrotor shaft. Nor was it finished as nicely as I would like it inside to allow perfectly smooth action. Some work with 240 paper to open it up then polishing the inside with 2000 to get a nice shiny surface. Almost frictionless now.

Snag #2

The pin on the slider that slips onto the stock lever is not long enough with the smaller diameter portion to prevent it from binding on the larger diameter portion. I have ground down the boss on the lever flush with the arm itself, but that's still not enough. I've also added spacers under the pivot mount to drop it down even further, still not right. Ok, need to back off and think about this

Have a great weekend everyone!

Jack

07-02-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

3 Blade Tail Rotor Conversion Completed

Finally! The Quick UK 3 blade conversion has been installed and is operational. The photos illustrate several points to be made.

First, the stock Hirobo arm must be drilled out from the standard 2.1 mm to 3.5 mm in order to accommodate the larger pin on the pitch slider. If you do this, go up 0.1 mm at a time to insure smooth operation, but not too much slop.

Next, the links I originally received were simply too tight on the pitch slider. I tried filing/grinding the inside arms of the links, but wasn't happy with the result. Contacted Budd Leigh Boulton at Quick UK, who graciously agreed to send me another set of links gratis. These were lost in the mail. Contacted Budd and he generously offered to send another set with tracking this time, again absolutely no charge. Cannot speak highly enough of his customer service! These links were snug, but operate fine. Also, the retaining pins with this newest set have grooves for C-rings (included), which the first set did not have. Nice extra security.

The blades are SAB CF 75mm long by 30mm chord. I decided for appearances sake, they looked too wide, so I cut them down to 25mm in a jig. The proportion, I think turned out very well.

Am in the process of uploading a video of the initial test stand run up. Will post the URL after it is online.

Jack

12-08-2011 Over year old.
csc

Senior Heliman

Phoenix, AZ

Nice!

______________________
eShuttles

12-08-2011 Over year old.
heliflyer7

Senior Heliman

North Carolina

Thanks csc! View the video here http://www.youtube.com/watch?v=NJjrnEaaUfE

Jack

12-08-2011 Over year old.
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Hirobo Lama SA-315 Electric Conversion

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