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HelicopterScale Model RC Helicopters Docs  Vario Bell 412 electric
02-03-2017 05:29 AM  9 months agoPost 181
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Andrew

I used Fusion 360, a cloud based program, that is free for personal use. I tryed a few others but somehoew I ended up with this one...

I never had the patience to sit through tutorials (but looking back at things maybe I should) so it was all trial and error. But the software is intuitive enough so that even I could make it....

Can't wait for my 3D guru to print it this weekend so that I can check it in real world...

will post pictures...

gh

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03-06-2017 08:10 PM  8 months agoPost 182
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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OK I need to update this thread a bit...
Had a small mishap during the initial spoolup...
stripped the Vario inner gear but was lucky that the fuselage was still on the ground. No big deal just a minor setback in timing and a few more precautions for the next attempt..

But all is not that bad and I made some progress on the doghouse... or top cowling..

I started to modify this and first wanted to use the magnets and for this part to be in three pieces... After some deliberation I came to conclusion that a two part build will be better...





did some filling... and then sanding... did some more filling... and then sanded some more... only to fill again and sand it off....
I even scribed some lines in it myself... the ones that are present in the real helicopter but were not here in the model... go figure...


the air vents... on the real one are different so no easy way out.. I had to cut the metal air intakes... and then remake the whole thing and glue it firmly from the inside...


Once happy with the basic shape... started the rivet therapy and made some other smaller details. Far from finished and ever further away from being perfect... but it is a start...


Klem

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03-06-2017 08:18 PM  8 months agoPost 183
ssmith512

rrKey Veteran

Indianapolis, IN USA

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Your rivet detailing is spectacular. I love the consistent sizing, spacing and straight lines. VERY nice modeling my friend!

Steve

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03-06-2017 09:19 PM  8 months agoPost 184
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Thank you Steve. It means a lot coming from you

Klem

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03-06-2017 11:25 PM  8 months agoPost 185
ChopperCrazy

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Sykesville, Pa. USA

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412

Wow, great work I wish I had half of your talent and patience.

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03-13-2017 06:01 PM  8 months agoPost 186
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Just as I wanted to do the maiden... I stipped the gears...

Today I got a few goodies in the mail today....

I finally realize why this set of gears is so praised...
should have listened a long time ago... I was lucy I guess....

This is one massive piece of gear and it is quite heavier than the plastic one...

Not much room for the gearmesh setting but once I'll lube it... I doubt that it will strip as the previous one did...

Klem

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03-13-2017 06:06 PM  8 months agoPost 187
chopper37

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NJ and Long Island

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Nice gears there Klem, they should not strip at all

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03-14-2017 01:36 AM  8 months agoPost 188
rcheli808

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Mililani,Hi-USA

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Really nice work Klem...

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03-14-2017 04:32 AM  8 months agoPost 189
Mojave

rrElite Veteran

Palos Verdes, Ca.​USA

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Hey Klem the heli is looking great! Those gears are a nice insurance policy. Make sure to remove the pinion from the trans and spin it in your electric drill to check that it's running true. That's the only thing that will kill that gear. Use some high pressure automotive bearing grease in the gear and you're good to go.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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03-14-2017 06:20 AM  8 months agoPost 190
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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thanks guys
Barry this is an absolutely great idea. Have not thought to check for the balance this way...
Will do this tonight

Klem

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03-14-2017 09:46 PM  8 months agoPost 191
Mojave

rrElite Veteran

Palos Verdes, Ca.​USA

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Hi Klem, the reason I suggested that is because when the plastic gear strips, the pieces can get between the pinion gear and the housing and bend the pinion shaft. It happened to me...
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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03-15-2017 06:01 AM  8 months agoPost 192
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Ok. Definitely worth a check... although I stripped mine early in the preflight process and stopped the spinning as soon as I saw "the little black pieces" on the bottom of the fuselage...

but again thanks for the tip.

Klem

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07-01-2017 04:36 PM  4 months agoPost 193
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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OK so I finally found some time when I was home... and when the weather cooperated a bit and decided to do a maiden flight...
Did all the preflight checks and it was all OK...

snaped one more photo... just in case...
IMG_1212 by Good Hunting, on Flickr

spoolup went as it should... no issues and concernes....
...no vibes...
so I flicked the switch to governed speed at 1300RPM... no change to the helicopter at the ground... and decide to get some air under the skids...

and just as I got it 30cm off the ground it started spinning around the main axis... it looked like the tail had no authority what so ever...

had just enough time to flip the TH switch and in she went...
IMG_1215 by Good Hunting, on Flickr

IMG_1216 by Good Hunting, on Flickr

IMG_1217 by Good Hunting, on Flickr

"TIS BUT A FLESH WOUND" said the black knight...

My trusted companion and I did the CSI work... although she was more concerned with an orange ball that with the bits laying on the ground... in a radius of 2m from the actual crash... but we recovered all the parts...

IMG_1214 by Good Hunting, on Flickr

it really looks worse than it is... the main blades are gone... so are all the links between the swash and the head... the mechanics mount gave way and was "thrown out" of the fuselage at impact... and there is a slight dent in the top cover...
No damage to the electronics... no damage to the mechanics... and no damage to the fuselage...

so I learned (the hard way again) that I did not mount the mechanics plate firmly enough (although this ended up saving the fuselage) and will fix that... I will make more links.... which is easy..

BUT

I found out that the tail is NOT holding... I used the tail blades that Vario recommends... using the mechanical components that Vario recommends (although set up a bit different) and using a "normal" head speed for a four bladed head...
and the tail gave in...

I COULD fit larger blades... could also fit wider chord blades... but at the end of the day I would "most likely" need to speed up the tail... OR am I off here?

gh

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07-01-2017 07:21 PM  4 months agoPost 194
rcheli808

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Mililani,Hi-USA

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"O Man"...I feel your pain.

Hang in there Klem.

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07-02-2017 03:07 PM  4 months agoPost 195
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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OK gentlemen (and ladies)

I found the culprit...
First I checked the TT as this is my own product but nope... I did everything fine and it works as it should.... nothing is moving there...
IMG_1220 by Good Hunting, on Flickr

then I checked the 40 degree tailbox....
and there lies the problem... the attachment simply turned freely under pressure...

man was I happy I spent all this time making the tail completely removable... it took me a while to get the gearbox out and I took this part off...

IMG_1226 by Good Hunting, on Flickr

now I assembled this part according to Vario's instructions so... I'm puzzled...

I guess I should grind the recess in the axis... for the set screws to hold firmly...

IMG_1225 by Good Hunting, on Flickr

I do have another gearbox which is intended for another project but I guess I'll swap it out if this one fails...

IMG_1224 by Good Hunting, on Flickr

any thoughts and or pointers?

Klem

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07-02-2017 03:17 PM  4 months agoPost 196
chopper37

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NJ and Long Island

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They show flat spots only on the gear side in instructions, if it me I would add a flat spot on coupler side also, just my thought.

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07-02-2017 03:29 PM  4 months agoPost 197
ssmith512

rrKey Veteran

Indianapolis, IN USA

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They show flat spots only on the gear side in instructions, if it me I would add a flat spot on coupler side also, just my thought.
Agreed. Typical good engineering practice - always have a flat surface for the grub screws to "clamp to" when fixing to a rotating shaft. And, file the end of the grub screw flat so you have a flat surface mating to a flat surface and not a pointy grub screw mating up to a round surface.

Steve

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07-02-2017 03:53 PM  4 months agoPost 198
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Ok. I can do that.
But is this a design flaw or my fault (somehow)?
Instructions show the flat part of the axis goes in the gearbox....

For a 95€ part this better not be a design flaw...

Klem

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07-02-2017 05:08 PM  4 months agoPost 199
ssmith512

rrKey Veteran

Indianapolis, IN USA

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My opinion it is a design flaw.

No flat spot on shaft then you have to really tighten the grub screw to "pinch" the shaft. Slippage can still occur at any time.

With a flat spot, you dont have to tighten the grub screw very much at all, just enough to hit the flat spot (use thread locker of course), so no chance of stripping the threads or grub screw and no slippage can occur. Stuff will break before the shaft slips on the grub screw.

I always add a flat spot if none is provided on any high torque situation. I had to do this on the retract shafts on Airwolf to keep the arm on the shaft from rotating under load. Ans I had to add flat spots to the tail drive shafts on Airwolf as well (to prevent exactly what happened to you.)

Glad you found the issue. Add flat spots to any tail shaft you have and feel confident that this kind of failure will almost never happen to you again.

Steve

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07-02-2017 05:18 PM  4 months agoPost 200
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Steve

Thanks

Will do this to all that I have

Klem

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