From an email I just recieved from Dave:
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.
Από κάθε γενιά μεταξύ κάθε έθνος ανθρώπων, να θυμάστε νεκρών στρατιωτών μας.”
Upper motor mount/lower mast bearing mount complete. More to follow
Excellent! Sounds like quite a task ahead of you. Good luck with this project at such a busy time.
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.
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
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.
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
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.
Sorry, I need to clean my camera lens. A bit blurry.
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.
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.
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.
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.
Alan I'm just spitballing, sorry. lol
Sorry Gunship..............I find twisted humor in alot of things...Infantry mentallity.Regards,Dave
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.
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!
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.
A closer look shortly after 2nd spin up.
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.
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.
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.
Main rotor balance and partial rotor-prop assembly.
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.
Lower mast bearing interlock CF brace.