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05-02-2020 11:29 PM  29 days ago
v22chap

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Granger, Indiana

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Sorry to hear that about Rox ,, but they all have a very limited time here with us don't they .

The S 67 is looking really good ,,, but I don't know about that covid 19 Hawk !!!
NO more comment !!!
Larry C ----------Bergen R/C helicopters
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05-03-2020 12:00 AM  29 days ago
206 pilot

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I’ll have a drink then fly a kite Ben Franklin.

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05-03-2020 12:31 AM  29 days ago
bwellmaker

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Long Island

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The difference tween a good hair cut and a bad one, about two weeks.

Done the hawk several times over the years. Felt like a good time.

Uih,

B.

Rich is going to get one next

Ha.

Ha.
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05-03-2020 02:35 AM  29 days ago
v22chap

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Granger, Indiana

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Yep ,, good time as you aren't going anywhere soon that people will see you .... only us other heli addicts that would do the same thing ,, and yes "priceless is the term " Larry C ----------Bergen R/C helicopters
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05-03-2020 03:26 AM  29 days ago
206 pilot

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I’ll have a drink then fly a kite Ben Franklin.

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It’s quite possible this is the longest my hair has been.. Rich
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05-03-2020 10:14 PM  28 days ago
bwellmaker

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Long Island

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Uih,

Got to the field today for a few flights. It has been maybe 3 or 4 months since I flew and it showed. No scale stuff just fish heads.

Got home around noon and continued on with my 67. Got stabs adjusted, the gear swings complete and adjusted, some cockpit work so a good day.

Tomorrow speed brakes.

Hawk is still holding in there. I did catch some schit at the field. All in good fun.

A few pics.

Stay safe my friends.

B

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05-04-2020 01:00 AM  28 days ago
206 pilot

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I’ll have a drink then fly a kite Ben Franklin.

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Good flying today..👍
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05-06-2020 08:17 PM  25 days ago
bwellmaker

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Long Island

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UIH,

I had to look at this thing all together.

Everything has been wired up and adjusted. Will begin work on the cockpit detail Maybe tomorrow. Still have a lot of detail work left but almost back into flight status.

This thing is ridiculous.

B

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05-06-2020 11:35 PM  25 days ago
g5sean

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Savannah, GA

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Looks awesome! This calls for a little AC/DC poetry:
Back in black
I hit the sack
I've been too long I'm glad to be back
Yes, I'm let loose
From the noose
That's kept me hanging about
I've been looking at the sky
'Cause it's gettin' me high
Forget the hearse 'cause I never die
I got nine lives
Cat's eyes
Abusin' every one of them and running wild!
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05-07-2020 12:37 AM  25 days ago
cobieg

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Florida

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Man that stance is way cool.

Ron
I didn't crash. I just ran out of airspeed, altitude, and ideas all at the same time!
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05-07-2020 01:46 AM  25 days ago
206 pilot

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I’ll have a drink then fly a kite Ben Franklin.

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Yeah you have to see it up close and in person it’s Bad A$$... Rich
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05-08-2020 12:13 AM  24 days ago
bwellmaker

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Long Island

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Anti progress.

Ha. How many times do we put schit together and then take it apart.

Good thing this things comes apart pretty easy.

UIH

B

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05-08-2020 01:50 AM  24 days ago
v22chap

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Granger, Indiana

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Ya... tell me about it , a!@#@!$%#%$&#&* Larry C ----------Bergen R/C helicopters
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05-08-2020 02:09 AM  24 days ago
206 pilot

rrVeteran

I’ll have a drink then fly a kite Ben Franklin.

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Yeah same hear..
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05-08-2020 10:50 AM  23 days ago
bwellmaker

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Long Island

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UIH,

I knew it was coming back apart so no biggie. I have to remove the main shaft to drill a hole to attach the bifilar adapter. Also gear door servo extensions service loop was too short. Removed those and will make new ones today.

All part of the process.

B
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05-08-2020 11:50 AM  23 days ago
cobieg

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Florida

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Ok, sometimes I don't know everything. What is a "bifilar"? And what does it do?

Ron
I didn't crash. I just ran out of airspeed, altitude, and ideas all at the same time!
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05-08-2020 12:38 PM  23 days ago
bwellmaker

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Long Island

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UIH,

A "bifilar" is a weighted mechanical device Sikorsky uses to absorb certain frequency vibration. The weights move around when the rotor is turning to find a center. This cancels the specific frequency depending on how it is weighted.

Here are a couple pics of the on on my full scale S-76.

I moved the weight around so you can see how much it moves.

B

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05-08-2020 02:05 PM  23 days ago
CoachE

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Cincinnati, ohio -usa

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Just toooooo coooool!!!!!!!BD Team Pilot / Get !T - Got !T - Perfect !T
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05-08-2020 03:15 PM  23 days ago
Notar

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Taxachussetts

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So they are made to not just sling out from centrifical force, they go to where the imbalance is and stay there?
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05-08-2020 05:11 PM  23 days ago
bwellmaker

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Long Island

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Joe,

Yes. The main blades are also fully articulating. They led,lag and flap when at speed. All working together to reduce vibration. It would scare you to see how much the blade are able to move around on the 76 or any articulating rotor head. Note the 2 different tuning pin sizes on the floating weights. One set dampens 3 Per Rev vibrations the other dampens 5 Per Rev vibrations.

There are also a couple of "shaker" boxes, one in the nose and one in the cabin overhead. Each box has a weight mass supported by springs. You can adjust the weights on the mass which helps to dampen vibrations as well. The mechanical method is old school but it works. The nose shaker bampens longitudinal vibrations, the cabin shaker dampens lateral vibrations.

There are now active systems out there that use hydraulic moog actuators to induce an opposite vibration into the airframe or gear box to cancel vibrations.

Vibration analysis is a voodoo science. We could talk for weeks about this subject.

B
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