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


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Date: Jan 28, 2012
RE: Human Interface Rotor System Helicopter (HIR) yes....way out in left Field
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The coaxial system w/ 2 fly bars works ok, but both fly bars need to be leading edge to leading edge. Trailing edge to trailing edge causes failure in the system.

When fly bars oriented leading edge to leading edge on both hubs are integrated into my airframe the lift across the rotor discs is reversed, so when the masts are tilted forward, the fly bars generate more lift  over the forward portion of the rotor discs and thrust vectoring is negated a great deal causing it to fly aft. The small scale that I've chosen does not have sufficient servo span of motion to affect flight direction. Larger scale needed. Going back to the single mast for now, but I'm not giving up. I've learned quite a bit about this mechanical morphing airframe. So, in theory if a have servos with more range of motion, tilting the masts forward will cause aft flight and aft mast tilt forward flight, but it' s 180 degrees from my original intent which is thrust vertoring and morphing airframe rotor disc control. I believe that torsion bars for flapping, lead/lag would be better



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Trailing edge to trailing edge lower hub fly bar orientation with upper hub being leading edge to leading edge. Causes system failure. Both hubs need to be leading edge to leading edge.



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Date: Feb 5, 2012
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I have a little more carbon fiber work, new CF motor mount, and minor soldering for the main motor.The 4 bladed set up is smooth, some what balanced, but I have not checked the tracking as of yet. I still need to trin the excess threaded studs of the socket head screws on the hub

 



-- Edited by davh12 on Sunday 5th of February 2012 11:49:46 PM

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Date: Feb 13, 2012
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Internet was down last night. Could not post updates. I extended the tail boom which made the CG heavy aft a little. In the process of extending the forward landing strut out to push the battery farther forward to re-tweak the CG.

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On lunch at the library. Net still down at home. First of 2 weeks of updates.

Dave

 



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Forward landing strut extended; more CG adjustment needed. Minor CF work/wire soldering. Shooting for week-end after next for flight test/crash

 

Dave

 



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Date: Mar 3, 2012
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Sorry, but the internet has been hit and miss and I've been busy with army stuff.

Murphy is kicking me while I'm down again, but I plan to get a reverse set of rotor blades today. The CF layered tail boom was too heavy for the airframe. Center of gravity is ok now, but I'll utilize an aluminum tail boom now. At least I have 1/2" to play with for CG adjustments. The 4 bladed hub was mostly balanced, but "mostly" does not cut it. I do not have a mill anymore, so I may need to just buy an aluminum hub. Changes are already in the process of being completed and should be posted tomorrow.



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Aluminum tail boom. Fitted well to the airframe and cleaned up the wiring routed from the TR motor.

 



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Wow....you're making good progress in your work Dave.....keep it up!!!

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Sorry it's been so long and thanks Travis for upadating via email.

I've had some time to sit back and look at my approach to the instability issues that I've ran into. The walkera hub that I was using had 2 bell cranks on each side of the hub that was intended for swash plate input control to control blade pitch span wise. There  is one more hub that I wnat to try to use with this airframe and that is the Art-Tech hub that is designed for their V22 Osprey. The rotors are fixed pitch with a leading edge to leading edge fly bar orientation. Both rotors control forward/aft flight through a rotational axis that is used to attach the pylon to the airframe with about 45 to90 degrees of forward/aft tilt with the manipulation point of the til radius at the 6 o'clock as seen from the side. As for the tail rotor issue, the wiring is correct, so now I'm just going with a gear driven TR. Attached is the video clip for Art-Tech's V22. Slide the player icon forward to about 5 minutes into the video to see the forward/aft tilt of the Art-Tech rotors.   The difference between Art-Tech's tilting masts and my design is that my upper airframe has the rotor mast statically fixed to the upper airframe and the upper airframe tilts independently of the lower airframe forward/aft, vectoring the thrust.

I also intend to scale up the coaxial version of this airframe to see how things go. Again, sorry it's taking so long, but that's the nature of things.

Dave



-- Edited by davh12 on Tuesday 13th of March 2012 08:01:23 PM

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Date: Mar 13, 2012
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tsheten8 wrote:

Wow....you're making good progress in your work Dave.....keep it up!!!


 

Second!

By the way, here's an update I got via email:

 

Travis,

A quick update for you. I'm having more electrical issues which have
me stumped because everything is wired correctly, but there may be an
issue with current flow to TR motor because they keep going out. Going
to a gear drien tail rotor. RC helicopters are tricky and the fact
that I'm using a moving airframe may be jacking up the gyro. The
receiver says that it's a gyro stabilized mechanism. I've got more
work ahead. Hopefully on the first I can start with a larger scale
coaxial HIR airframe. The torque issue with single rotor w/ TR is just
on hold for a bit. A lot of the torque stored in the airframe as
"potential energy" of sorts is all concentrated at the 2 forward/aft
pivot axis which needs to be smoother and a bit tighter. I may need to
redo just the lower airframe and put the tilt axis a bit farther
apart.
I've got a full plate trying to keep within my budget and now the
patent office has been in touch and I'm involved with a few small
"clarifications" as they put it. They said it should be an easy fix
with regard to my claims outlined in the patent. Patent Office reps
are picky about the wording. I'll be in touch again and I'm not giving
up.

Best Regards,

Dave



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Date: Mar 25, 2012
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New hub blade grips assembled, w/o bell cranks. In the process of converting to a gear driven anti-torque set up, as weel as an input gear assembly to the tail rotor.

Dave



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Date: Mar 25, 2012
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differences between the old and new hub

 



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Date: Apr 7, 2012
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Finally got the parts from hong kong. Busy this week-end. Take care.

David

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All the best Dave.....

Regards
Tsheten8

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Tail rotor gear completed...my God I hate the small pieces. Use tweezers if you go small scale. Now I just need to fab an input gear assembly.

Dave



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Quick vid clip.

 

Dave

 



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Date: Apr 23, 2012
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An update via email:

Travis, Our internet has been down almost a week and the library on post is rennovating, so I've had no internet for several days. This week-end I finished the input gear assembly and now I just need to order a servo for tail rotor pitch. Hopefully within two weeks, I'll be able to spin it up and see what happens. I've taken pics but I have to wait until the net is up before I can upload. So, when I do, it will be a few uploads at one time. Dave



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At Barnes and Noble. Give me a few minutes, upload shortly. I apologize, but I have not had the net in over a month, but almost done with the helo changes.
Dave



-- Edited by davh12 on Saturday 5th of May 2012 07:01:48 PM

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This video is a week old. I have brigade staff duty, so I'll be working tomorrow. Anither update monday afternoon.

Dave

 



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Date: May 8, 2012
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Rotor blades are balanced. Next test flight/crash this week-end. I had to re-adjust the CG due to the TR extending farther aft than before. I slide the battery carriage farther forward. Minor tweaks. I foresee no issues other than adjustment of the forward/aft tilting servo.

 

 



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Date: May 13, 2012
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I keep getting ball tapped by Murphy. The new motor was seized up and the older just will not work. I may need and inline voltage regulator, even though everything is wired correctly. The circular chip board may be a voltage reg and if it is, too much current going to the motor is what causes the issues. The rotor blade I chose has an increased span and chord width from the stall region out through the driving and driven regions starting at about 1/4" with a gradual decrease in chord width. I'm headed to the field tomorrow. I'll be out of the net for several day. I have enough material to start the scaled up coaxial when I order the new motor.

 

Dave

 



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A bit more detail.

 

Dave



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Date: May 14, 2012
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Found another electric motor, but I need to resolder the wires...when I get a chance. Otherwise I'll order a new one.

Dave



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Date: May 23, 2012
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Found the inline speed con that i need and I will upgrade to a brushless motor as well.

 



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Date: Jun 4, 2012
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Hope to have the cahnges made within 2 weeks. Work has me busy. Got leave in late June. Definite update by that time, hopfully a successful flight.



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Date: Jun 17, 2012
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Most of the soldering done, bit more for wire extensions. Coaxial airframe is coming along ok....this single mast is a thorn in my side that I want to see fly first.



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Date: Jul 15, 2012
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Sorry folks, I was on leave. To date so far, I have started the larger coaxial HIR helo. The single mast I have not given up on, but I did find a source of the electrical issues. One of the main motors had reverside wires, so what I thought was positive was actually negative. So, I've ordered two sets of bevel gears and I intend to scale up the electrical and have durable nylon gears trans power to the TR.

My step daughter got me this coaxial helo for Father's Day. An Air Recon from propel RC. Excellent control given that there is not a swash plate. Further it has a digital cam attached to the tiny airframe. Works pretty well. The tiny horizontal TR pitches the airframe forward/aft causing the entire airframe to tilt, so I'm not discouraged about my HIR airframes. My concepts just change part of the airframe to tilt the respective airframe/mast. 

Sorry it has taken so long, but it takes $$$$ to tinker and change concepts around, raw materials etc. 

 

 

Dave

 

 



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Date: Jul 16, 2012
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All the best Dave...hoping to see a full-size version of your concept soon!!....

regards,

tsheten8

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Date: Jul 30, 2012
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Worked through the weekend late into last night. Got both airframes attached on the coaxial, servos mounted, outer mast installed, and did a power up. Everything is good thus far. Upper airframe pitches forward/aft very smoothly. Attaching the battery swivel housing and yaw control surface this week/week-end. Hope to fly this week-end. Was late last night, sorry no recent pics. I'll post next week. Should be a good flight. shaky flight, or a good crash.  HA!

Dave



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