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Post Info TOPIC: Human Interface Rotor System Helicopter (HIR) yes....way out in left Field


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Posts: 3381
Date: Jul 11, 2011
RE: Human Interface Rotor System Helicopter (HIR) yes....way out in left Field
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From an email I just recieved from Dave:

 
Travis,
I have not given up on the helo. I have just been real busy. Out in the field all week last week and next week going to the field again for 10 days. A lot on my plate. I did get a few more parts over the week-end. A new reduction spur gear, 50T with the same pitch gauge, but the gear is a bit thicker so I'm hoping that there will be no flexing as it spins up to running RPMs. Anything to reduce vibrations. Waiting on the additional TR blades, new main motor, and a balanced thrust bearing.....US Postal Service. Go figure. Anyway, I hope all is well on your end. I'll update this Saturday prior to leaving for the field on Sunday. Take care.
Dave
 
Just to let you know of his wherabouts.


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Veteran Member - Level 3

Posts: 317
Date: Jul 14, 2011
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Thanx Travis,,

Sorry it's been so long. I was in the field for a week and going to the field for 10 days next week. All that I have been able to do lately is gather parts for when I get a free moment to work. I may be changing web site providers so the "envision helicopters" site may be down for a bit until I get re-established with a new provider.

Take care.



Dave


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Posts: 317
Date: Jul 16, 2011
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Upper motor mount/lower mast bearing mount complete. More to follow

Dave

 

 



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Posts: 403
Date: Jul 17, 2011
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Excellent! Sounds like quite a task ahead of you. Good luck with this project at such a busy time.



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Posts: 317
Date: Jul 26, 2011
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Commander 31,

thanx...yes it is busy. Got to wash my balls for the first time in a few days. Insect bites and tired of watching new lieutenants execute linear ambush and raids. Most caught on, but as usual, they over think battle drills.

Going in for surgery again day after tomorrow; after 15 months of army medicine wasting my time, I finally got them to cut the bone spur out of my heel. Only a few years left until retirement, but the Infantry thing is taking it's toll.

Dave



-- Edited by davh12 on Tuesday 26th of July 2011 11:16:05 PM

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Date: Jul 26, 2011
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My web site is down until i find a better provider. I'll still post here and You tube.

Dave


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Posts: 1328
Date: Jul 29, 2011
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LOLz, good luck with all! We love hearing from you. Sorry I was gone so long, I dropped off the face of the Earth for a bit. Busy schedules seem to be pinning us all down. :P



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Date: Jul 29, 2011
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Leela,

 

That's ok.....I seem to drop off the face of the earth alot lately. Apparently bad memories from Iraq surface when I come out of anesthesia. Hospital folks got an ear full.

 

Dave



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Date: Jul 31, 2011
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Wow...I feel like hammered dog crap. Percocet spaces me out a bit.

Just to let everyone know I'm not giving up on the helo. I need to juggle a few financial issues and gather a few more parts. I'm close to finishing...I think, but a few things need to be dealt with first. When I get healed up I'll post another update. I'm waiting on orders and as always, life in the military gets tossed into the air when it comes time to change duty stations..............personal plans included. On a lighter note, the Army Aquisitions, Logistics and Technology posted a portion of my UAV paper with regard to UAS implementation at the platoon level.

http://armyalt.va.newsmemory.com/

Highlight, copy and paste in the address window. Use the drop down arrow for the pages. I'm on page 124.

I give credit to all of you as well with any "high lights" on the work that I do. Your feedback has been important for all of the progression and keeping the mind turning to approach a different way of looking at mechanical problem solving. As always, I welcome any negative feedback as well. All input is needed and every perspective matters.

All of you here and a few others are my motivation for not quiting...aside from the fact that I do not like quiting until mathematics and physics prove me wrong. I appreciate all of the encouragement and your input and ideas that you bring to light. I appreciate your passion for rotorcraft and I wish to encourage all of you as well. More later.

Best Regards,

Dave



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Posts: 317
Date: Aug 26, 2011
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New mast bearings in.............more work this week end. May work on the aluminum mock up as well. I've been putting off assembling the control linkages.

Dave

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Posts: 317
Date: Aug 27, 2011
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Upper mast bearing mounted; a few small changes need to be made; not using a power train from the motor to the reduction gear because the couplings are too long. Gotta clip to follow.

 

Dave

 

 



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Date: Aug 27, 2011
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Sorry, I need to clean my camera lens. A bit blurry.

 

Dave

 



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Date: Aug 29, 2011
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4th servo actuation with the changes. Small adjustments here and there. Lower mast bearing mount changed from doubling as the upper motor mount to now being the lower motor mount/lower mast bearing. Couplings are too long for a drive train to spur. Going back to pinion direct to reduction gear, but motor will be about 4 mm lower tha original configuration.

Dave

 

 

 



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Posts: 226
Date: Sep 2, 2011
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Gunship wrote:

I'm an ammeture with electronics but I learned somewhere that sometimes the colors aren't always a color code and mean nothing. But if I had to guess, I would say it is the negative wire.


 You probably get electrocuted alot.



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Posts: 317
Date: Sep 2, 2011
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Hanneton III,

Not sure why you posted that here about the elctrical wires, but you're right about the "probably get electrical shock all the time" with regard to what you said about gunship. That made my day.

Dave

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Senior Member - Level 1

Posts: 500
Date: Sep 2, 2011
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hannetonIII wrote:
Gunship wrote:

I'm an ammeture with electronics but I learned somewhere that sometimes the colors aren't always a color code and mean nothing. But if I had to guess, I would say it is the negative wire.


 You probably get electrocuted alot.


 

Well that was uncalled for. I don't mess with anything I don't have a full knowlege about. It's common sense.



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Date: Sep 2, 2011
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Alan I'm just spitballing, sorry. lol



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Date: Sep 4, 2011
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Sorry Gunship..............I find twisted humor in alot of things...Infantry mentallity.

Regards,

Dave



-- Edited by davh12 on Sunday 4th of September 2011 06:22:35 PM

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Posts: 317
Date: Sep 8, 2011
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Sorry folks, the net was down. A lot of CF work around upper mast bearing, lower mast bearing spacing, etc. Waiting for alloy steel rod for actual mast. Tail rotor was attached and rotated down and forward to allow the tail rotor blade tip path to have clearence from the main rotor. Lower airframe has 2 additional CF braces from the vertical struts to aft to correct the torrsional flex. Tight fit but it has enough clearence between the two airframes.

Dave

 

 

 



-- Edited by davh12 on Thursday 8th of September 2011 10:56:51 PM

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Date: Sep 23, 2011
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An update via email from Dave:

Sorry for the delay in updates. I hope to have my computer updated with java script this week end. I did a power up last week-end, the 2nd spin up since I've started. I little instability between the 10 o'clock and 5 o'clock positions if viewing the rotor disc from above the airframe. There are a number of considerations when scaling up or down from small scale to full scale and the opposite. One of those being mass. RC 2 bladed helos use a rigid hub that does not teeter. On the opposite end of the "scale", two bladed full scale helicopters use a semi-rigid rotor hub that teeters to eliminate dissymmetry of lift. I need to touch base with a pilot friend of mine who pilots a med flight helo. Further, this week-end, I will do a 3rd power up with a completely rigid hub and one or two other ideas, should that configuration not work well.

Sounds like quite an adventure, so good luck with everything, Dave!



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Veteran Member - Level 3

Posts: 317
Date: Sep 23, 2011
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Travis,

Thanks.

Trying to work through the Java stuff now. Got the new java down load, but the "ActiveX" crap is preventing me from viewing You tube or even signing on to you tube. All videos from last week-end and what I do this week-end will be post on my blog as well sent to Travis for posting here.

Regards,
Dave

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Posts: 317
Date: Sep 23, 2011
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There will be additional changes to the hub over this week-end. My laptop is back on line.
I had forgotten that there are a handful of considerations when scaling down or up between small and full scale. Most RC helos have rigid hubs and utilize blade bending to negate disymmetry of lift, so this week end I will be restoring the hub assembly back to and "RC" heli style hub. The mass/weight consideration apply to larger and full scale helos that utilize semi-rigid rotor hubs that teeter. The directional control will still be attained with the mechanical morphing airframe. In this vid clip I state that I will use a 3 bladed rigid, but only if this week-end proves unsuccessful.

Dave



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Posts: 317
Date: Sep 23, 2011
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A closer look shortly after 2nd spin up.

 

Dave

 



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Veteran Member - Level 3

Posts: 317
Date: Sep 23, 2011
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Some changes to the aluminum mockup. I 'll attempt to start the tilt mechanism for the mockup, but right now my priority is getting the demonstrator in the air.

 

Dave

 



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Veteran Member - Level 3

Posts: 317
Date: Sep 23, 2011
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Mock up video clip and CF prototype changes prior to 2nd power up. Sorry folks, I'm trying to catch everyone up since my PC has been down.

 



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Veteran Member - Level 3

Posts: 317
Date: Sep 25, 2011
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Re-fab of the rotor hub finished yesterday. Trying to track down some ball links today.

Regards,

Dave

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Veteran Member - Level 3

Posts: 317
Date: Sep 25, 2011
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I had wanted to finish today, but the linkages between the rotor-prop & hub is taking a bit more time than I had anticipated. Pics here rotor-rop balance, one blades has an additonal CF pin due to balance. I still need to fab a teetering block for the rotor-prop.

 

Dave



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Posts: 317
Date: Sep 25, 2011
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Main rotor balance and partial rotor-prop assembly.

 

Dave

 



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Veteran Member - Level 3

Posts: 317
Date: Oct 1, 2011
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Rotor-prop teetering hub/horns are almost complete. It's steady but slow, shaping, balance check  and so on. Unless unforseen mechanical  issues arise, tether flight tomorrow.

 

Dave

 



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Veteran Member - Level 3

Posts: 317
Date: Oct 3, 2011
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Lower mast bearing interlock CF brace.

 

Dave

 



-- Edited by davh12 on Monday 3rd of October 2011 04:07:47 PM

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