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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion Docs  Lakota uncovered
01-04-2016 11:58 PM  4 years ago
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capesandblaster

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Truro, MA

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Lakota uncovered
Well after getting my private pilot certificate, a major bath remodel, a couple of back surgeries and everything else life threw at me for the last year, it was time to clean up the workshop and take the plastic off the Lakota. It took me a year plus to get to this stage, so I hope I can make some better progress. It started as a Vario EC145 with extreme mechanics running 12s electric. I've had it flying pretty good, but now gonna add some weight to this bird cuz I have a box load of scale modela goodies to go on and in her!

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01-05-2016 04:45 AM  4 years ago
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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Ooooohn nice!! I love me some UH-72.
they are here now at rucker by the dozens.
nice to see another one being done.
drive a rotary, fly a rotorcraft
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01-05-2016 05:52 AM  4 years ago
capesandblaster

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Truro, MA

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So I had almost a year to ponder an issue I had with the tail drive shaft and please let me know if anyone has had it also. I'm running a 6mm vario s/s shaft from the extreme mechanics to the angled gearbox in the tail with a bearing support about 12 inches back from the mechanics side. When the head rpm hits about 1150, I get a harmonic vibtation in the shaft that gets worse with more rpm. The shaft wobbles nearly an inch at its worse, but up to that rpm it runs pretty true. I've tried a new shaft and moved the support bearing fore and aft, but neither helped. I think it's too long of a run (30ish inches maybe) to only have 1 support. I've got 4 trex 500 boom bearings with rubber torque tube holders and slide them into a 15mm id aluminum tube and try and support the majority of the shaft length. Anyone had experience with this?
I'm running a scorpion 4035 400kv motor, CC HV120, 3 x align servos on head and bls451 on tail. Gyro is a helicommand hc3x with spektrum satellites. It flys pretty well and i've thrown a few extra pounds in it to simulate finished weight, and found i need to bump up my rpm a little. I think the harmonic vibration is affecting the tail some, so I want to get that resolved.
Heres a few more pics.
Adam

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01-05-2016 08:21 AM  4 years ago
Andy01

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Brisbane, Australia

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Adam

Very nice looking with lots of great detail.

I am still busy with my Baumann EC-145, and I am also have vibe issues with the tail drive.

I am using Goblin 770 mechanics with a Joe-special tail drive adapter. I fabricated my own TT using a 5mm stainless hypo tube (same as on my Vario Long Ranger). I have 3 bearings - one between mechanics & tail servo, one near the front of the removable tail boom, and one a couple of inches in front of the Vario 40° angled gearbox.

Initially I was running a couple of 1/10th scale dogbones (same as my Long Ranger which has run for a few years with them). They literally wore out in about 15 flights, so I upgraded to the Vario couplings. Since I did this a couple of minutes into the flight I start getting a loud vibration - can't see of feel anything on the heli in flight, but I can hear it, and the SK720 vibe log tells me it is there (the vibe at tail rpm increases about 6 times when it starts).

I have shortened the TT slightly (the Vario couplings were slightly longer than the Khyosho ones I was using) as I felt it may have been under slight compression causing a wobble, but I am yet to test it because of windy or wet weather (hopefully tomorrow).

I am running 1050rpm with 4x 820mm LH/CCW wide chord (64mm) asymmetrical HeliTec blades, and this did not change with the recent change on the TT couplings.

Please keep us updated on any findings.

Thanks
Colin
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon )
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01-05-2016 12:17 PM  4 years ago
WIRLYBIRD

rrVeteran

CAPE TOWN / SOUTH AFRICA.

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Tail drive to tail.
On my NH 90 turbine if I remember I used 3 to 4 bearings in a tail boom mounted in the tail. This housed a stainless torque tube connected with Vario dog bone at the mechanics and the Vario universal at the back. Done 9 years of flying no noise at all nothing ever replaced!!!! But I did battle to get it dead straight.
WHAT GOES UP MUST SURELY COME DOWN.
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01-05-2016 12:31 PM  4 years ago
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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my Lakota is smaller, a 600 sie but I use a flex cable. some do not like the flex cable idea but it wrks very reliably and no vibration issues.
On my tube drive models, I try to use several bearing supports in a tube drive system especially ones that are quite long. I also allow a little back and forth play of the tt between the universal joint couplings

drive a rotary, fly a rotorcraft
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01-21-2016 06:28 AM  4 years ago
capesandblaster

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Truro, MA

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Does anyone know where to get 15mm OD, 1mm wall thickness aluminum tubing? I've checked all my local metal suppliers, and noone carries it. I've found it online, but only in bulk. Need 2 about 24 inches for the tubular steps that mount to the landing gear. Wanted same size diameter as skids, plus most of modela's parts are sized for it. Please let me know if ya can help.
Thanks, Adam
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01-21-2016 06:37 AM  4 years ago
capesandblaster

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Truro, MA

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Got the wire cutters pretty far along, gotta love microfasteners bolts! Still got some finish work on them and just spent a couple hours making 8 of the tiny brackets the cutters support struts bolt too. Need stronger reading glasses!!

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01-21-2016 08:49 AM  4 years ago
Andy01

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Brisbane, Australia

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Adam

Can you not use either 5/8" or 9/16" tubing - both are about 0.8mm larger or smaller than 15mm, which would be barely noticeable. Both appear to be quite available in US.

Not sure about the Lakota, but many EC-145 have a round step on one side and a flat topped step on the other side.

This is 15mm x 2mm (wall) x 500mm - only 20" long and a bit heavy;

http://www.ebay.com.au/itm/Aluminiu...OsAAOSwHnFVjHmV

Colin
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon )
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01-21-2016 03:24 PM  4 years ago
capesandblaster

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Truro, MA

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I've got some 5/8 thin wall from k&s as my backup. Its a little too big, but very light. 9/16" would be better, but i can only find that in brass which is much heavier. I saw they have the triangle step on the pilot side, but I have these nice 3d printed brackets for round tubing. I will probably modify that sides brackets for a triangle step, but still need the right side tube. Thanks for the ebay link, 2mm would be heavy, but its a fall back.
Adam
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01-22-2016 08:57 AM  4 years ago
Andy01

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Brisbane, Australia

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Adam

Not sure how close to you, or shipping, but plenty came up with a quick Google search from Australia.

https://www.google.com.au/search?hl...inum+tube+in+us

This was one of the first ones

https://www.metalsdepot.com/catalog_cart_view.php?msg= - $8.72 for 4'

Colin
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon )
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01-29-2016 02:46 AM  4 years ago
WrenFlyer

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Mississippi

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Love it! I work at Airbus, used to be on the Lakota production line but I'm now on the AS-350 Flight line. Very nice looking model! I've got to get on my scale modeling....I miss my RC helicopter buddies!Mr. Haney
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01-29-2016 04:23 AM  4 years ago
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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we miss you too man! I want to see that Astar done! drive a rotary, fly a rotorcraft
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01-30-2016 12:45 PM  4 years ago
capesandblaster

rrApprentice

Truro, MA

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Thank you, comin along slowly. I found a 15mm aluminum tube that I cut from a fish net I had laying around ( for the greater good). It's 1mm thick wall and fits perfectly. Finished the wire cutter supports and brackets. I thought the supports were too big a tubing until I studied the real ones, and saw they're pretty beefy.

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01-30-2016 01:45 PM  4 years ago
WrenFlyer

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Mississippi

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Your wire cutters look great! The real ones are a PIA to build up and install.Mr. Haney
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02-24-2016 06:39 PM  4 years ago
capesandblaster

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Truro, MA

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Found some cool diamond plate styrene for the floors. I reshaped the top wirecutter to get it closer to the real one. Gotta love microfasteners selection. Theyve got scale nuts to go with the 0/80 hexhead bolts. Nice scale size.
Adam

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02-25-2016 10:53 PM  4 years ago
capesandblaster

rrApprentice

Truro, MA

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Steps from styrene

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03-07-2016 03:22 PM  4 years ago
capesandblaster

rrApprentice

Truro, MA

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Been working on the landing gear. The clamps were a pain, but came out pretty good.

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03-07-2016 04:17 PM  4 years ago
ssmith512

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Indianapolis, IN USA

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I'd say they turned out quite a bit than "pretty good". Nice!!Steve
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03-07-2016 04:58 PM  4 years ago
capesandblaster

rrApprentice

Truro, MA

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Today, workin on the rubber pad steps for the right side tube. Found some corrugated basswood and cut it into a strip. It is pretty close in style to the real rubber.

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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion Docs  Lakota uncovered
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