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HomeScaleAircraftScale HeliScale Helicopter Main Discussion Docs  Hirobo Lama SA-315 Electric Conversion
01-29-2012 03:42 PM  6 years agoPost 161
heliflyer7

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North Carolina

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Hi fireblade,

Wasn't sure if you were referring to me or not, but you can see mine on this page:

https://rc.runryder.com/t678792p2/?p=5609737#RR

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01-30-2012 12:39 AM  6 years agoPost 162
FloridaHeli

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jacksonville, florida

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Latest photos of mine at the 2012 Daytona Heli Fly-In with Hirobo 3 blade head, blades and Quick UK 3 blade tail.

I've got the Singapore TMRF Electric Conversion Set (for Hirobo S30)(S30-A-V2) on order for my on-the-shelf basket case Lama that I'm hoping to duplicate Bell Blokes awesome rendition.

This hobby is WAY too expensive!!

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01-30-2012 07:32 AM  6 years agoPost 163
Bhavik

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London

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what kind of servos do you use with the three bladed head? I found that a futaba 9151 (9.5 KG of torque) had trouble on the collective at head speeds over 1500 RPM.

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01-30-2012 07:45 AM  6 years agoPost 164
Jockobadger

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Snoqualmie, Washington USA

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Bhavik - what kind of trouble? Not enough torque? Please advise as I'm building one with three-blade head right now.

Century Bell 47 III, RCA,700 UH-1N, Hirobo Lama, Logo 500, Logo 400, Trex 550e, HC3SX, Kontronic

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01-30-2012 10:18 AM  6 years agoPost 165
Bhavik

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London

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Jackobadger, in flight it feels like the collective servo is binding at higher head speeds - I feel the head would benefit from thrust bearings particularly as I am using 550mm blades (120 grams per blade, I think). I have tried replacing the stock radial grip bearings with expensive SKF ones, it just seemed to bind / struggle more! I found that if I kept the head speed around 1500 RPM I had no trouble with the collective. I currently have an BLS352 servo on order for the collective (14.4KG @4.8V), I will let you know how I get on. For the cyclic servos I have the good old 9202's and find them perfectly fine.

This is a new machine that I have rebuilt after suffering from a catastrophic frame failure from my first lama, I could not resist but to buy a new one This time round I went with the three bladed head and a futaba 750 gyro.

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01-30-2012 11:39 AM  6 years agoPost 166
FloridaHeli

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jacksonville, florida

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Bhavik
I'm flying with JR NEH531's and have no problems.

This hobby is WAY too expensive!!

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01-30-2012 11:41 AM  6 years agoPost 167
Bhavik

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London

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FloridaHeli, What blades and head speed do you run on yours? Whats your pitch range?

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02-04-2012 02:49 PM  6 years agoPost 168
Bhavik

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London

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The new futaba BLS352 servo on the collective has solved my problems, the pitch now feels much more precise.

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02-06-2012 11:41 PM  6 years agoPost 169
heliflyer7

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North Carolina

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Hi Bhavik,

If you disconnect the servo link from the collective pitch arm and just move it by hand, does it move freely and smoothly? There will be some resistance, through the links and swash friction, but it should be equal and moderate throughout the total range.

The reason I ask, is you are using a servo with 200 oz/in of torque at 4.8 Volts. If you did have any binding, short of a seized bearing, that servo would power right through it without breaking a sweat

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02-07-2012 07:37 AM  6 years agoPost 170
Bhavik

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London

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Hi Helifler7,

Yes that is the first thing that I checked and it is smooth to move by hand. The problem I had with the old collective servo was that it would work perfectly on the bench and move the swash up and down very smoothly - but not when the head was at full speed!

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02-07-2012 02:46 PM  6 years agoPost 171
FloridaHeli

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jacksonville, florida

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Bhavik

FloridaHeli, What blades and head speed do you run on yours? Whats your pitch range?
I'm runing the stock 3 blade Hirobo set up for the Lama. Pitch is something like +10 to -10. If it is real important I will verify the pitch for you. I tried a set of CF 550 blades but they were real pitchy and would have required Tx changes I don't want to make right now. They were also a lot wider, longer and did not look very scale.

Photo below.

Let me know if you need more info.

Thanks,

This hobby is WAY too expensive!!

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02-12-2012 10:02 PM  6 years agoPost 172
Bell Bloke

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UK

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Hi Florida Heli, is there any reason why you are -10 on the pitch... it sounds a bit 3D to me
If you are finding it pitchy, try adding some weight to the nose, I know this is not an ideal thing to do, but it will greatly improve the way it flys.
My pitch is -3 +12 which is just nice and scale and easy to fly.
Just my thoughts, all the best Bell Bloke.

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02-13-2012 01:08 PM  6 years agoPost 173
Eylau2005

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Italy

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LAMA and auto
did anyone ever try an Auto with this model, for pleasure or because a motor shut down? Just curious to know...

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02-13-2012 01:23 PM  6 years agoPost 174
meatbomber

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Klatovy, Czech Republic

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I had a forced landing last weekend, wasn't paying attention to the timer and for some reason didn't hear it beeping.. so just turning from base to final in a descending left turn with an external sling load I noticed I was loosing power, so I managed to dump the cargo, drop the pitch and flare to a sliding landing with the bit of power remain from the low voltage cutoff.. so full auto no, and with the 3 blade head and the disk loading this thing has I wouldnt dare to try..

I'd definitely try to auto the 2 blade Nitro version.. because the flameout will happen sooner or later

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02-14-2012 12:26 AM  6 years agoPost 175
heliflyer7

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North Carolina

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I autoed mine in beautifully from about 4 feet up when my rcvr (S-PCM) took a hit and went into failsafe (0% throttle or in my case ESC). Since the 3 blade heads are normally running no more than -3 deg pitch, never mind the extra weight of an electric version, you're pretty much depending on powered inertia to save your bacon. If I'd been more than a couple feet higher, it probably wouldn't have been quite as pretty.

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03-02-2012 09:25 PM  6 years agoPost 176
fireblade48

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Silsbee, TX.

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Hirobo Lama
After trail, after trial and frustration. I have decided to re convert my 3 blades lama back to its non scale 2 blade head configuration. I could never get it fly as well with the 3 blades as I can with 2. It has been very frustrating not to have issue after issue with the helicopter.

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03-03-2012 12:19 AM  6 years agoPost 177
teamdavey2001

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Sunnyvale, California, USA

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I used to auto my nitro one on two blades. There is not much reserve so it is a bit safer to do it when there is a breeze.

This was with weighted woodies so with a decent set of composite blades it should be fine.

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03-03-2012 02:40 PM  6 years agoPost 178
heliflyer7

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North Carolina

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Hi Fireblade48,

You may have mentioned before, but what blades and stabilization system (if any), do you have on your 3 blade setup? Do you know what the headspeed was in a hover? What was the main problem you were having?

To be honest, a 3 blade head may never be as stable as a two blade with a flybar on this machine, but it can be very, very close.

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03-03-2012 03:23 PM  6 years agoPost 179
Jockobadger

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Snoqualmie, Washington USA

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Hi Fireblade,

They are kind of expensive, but the Helicommand HC3SX works great for 3 bladers. I have a 550 that I put a 3-blade head on for AP. The head is almost exactly the same size as the Hirobo (I have both) and it is solid as a rock with the HC on it. I have the Lama kit with 3 blade head, got it about 2 months ago, but haven't had time to build it yet because of work. It is my intent to put a HC on my Lama and based on my experience with one on my Century Bell 47, which is very close in size to the Lama, I am betting that it will be very stable. Thanks

Century Bell 47 III, RCA,700 UH-1N, Hirobo Lama, Logo 500, Logo 400, Trex 550e, HC3SX, Kontronic

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03-04-2012 01:44 AM  6 years agoPost 180
fireblade48

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Silsbee, TX.

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Hirobo Lama
Hey guys thank you for the input, and suggestions. It seems that I am constantly dealing with issues like vibrations, or its too sensative to input. Vibrations aside, there was the issue of stability, and sensative inputs. Despite of having 40% export and dual rates on low rates. It was either not enough control authority, or too much. Because I love this model, I have not flown it because of the mentioned issues. I have flown it today with the 2 blades and the flybar and it was refreshing and fun. Last time I flew this model was last May. So I just got frustrated, and decided to revert back to the non scale head. I am using the Align 3gx system programed by a friend who is really an expert with that particular system. He set it up and even he said it was way too sensative even for him. So here is what was in it, 3 blade Hirobo head with Hirobo 550 wood blades , bell hiller set at 93%, and the gains set at over 80% both for elevator, and Aileron and it was still too sensativ. So I re converted back, and I ask enjoying it .

Mike

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HomeScaleAircraftScale HeliScale Helicopter Main Discussion Docs  Hirobo Lama SA-315 Electric Conversion
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