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06-24-2010, 09:04 AM | #61 (permalink) |
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Or for a guy bringing you Timmie's.
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Terry MAAC#78357 IRCHA#3269 AlignT-Rex 450 SE V3 2221-8/ Align T-Rex 600N,OS55HZ / Align T-Rex 600E 12S A123's / Align T-Rex 700N YS91SR/ Bergen Intrepid EB Zenoha 260/ |
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06-24-2010, 09:17 AM | #62 (permalink) |
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Join Date: Apr 2009
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He, he, he
......well, I've ordered a couple prototype blanks Water-jet cut from 6061 aluminum stock, but the price so far is off the wall and not at all encouraging. Maybe a good excuse to get me a CNC Mill? (the wife's not buying that story either) So, you all may have to settle for some Trinidad Rum ....not sure how much they will let me on the plane with.
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A helicopter in flight is a working demonstration of all the basic physical laws of the universe in action. Member: AMA 928457 - IRCHA 3449 |
07-05-2010, 03:57 PM | #63 (permalink) |
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Join Date: Apr 2009
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Finally got it to a pre-production prototype:
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A helicopter in flight is a working demonstration of all the basic physical laws of the universe in action. Member: AMA 928457 - IRCHA 3449 |
07-06-2010, 11:14 AM | #64 (permalink) |
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Very nice work!
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Terry MAAC#78357 IRCHA#3269 AlignT-Rex 450 SE V3 2221-8/ Align T-Rex 600N,OS55HZ / Align T-Rex 600E 12S A123's / Align T-Rex 700N YS91SR/ Bergen Intrepid EB Zenoha 260/ |
07-06-2010, 12:22 PM | #65 (permalink) |
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Join Date: May 2006
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Looking forward to purchasing one of these bad boys!
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Have laser, will travel. |
07-06-2010, 01:38 PM | #66 (permalink) |
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Join Date: Apr 2009
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If only I could bring down the cost of machining the blank. These were Abrasive, Water-Jet cut from sheet aluminum.
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A helicopter in flight is a working demonstration of all the basic physical laws of the universe in action. Member: AMA 928457 - IRCHA 3449 |
03-01-2012, 10:07 PM | #67 (permalink) | |
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Join Date: Aug 2009
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Quote:
I've tried it both ways now with the servo mounted inside and outside the frames. Initially I built it with the servo mounted to the inside and collective pitch travel was virtually unlimited. I measured pitches in excess of +/- 15° which is excessive. That servo was later found to be defective and was replaced. Admittedly out of laziness, I mounted the replacement servo on the outside of the frames. Because the bellcrank will interfere with the servo as previously noted, It's possible to get a MAXIMUM of +/- 12.5°. Right now, 12.5° is plenty for me. If I decide I need more, the servo needs to be mounted inside the frame where the manual suggests. I think having the servo outside the frame has both an advantage and a disadvantage. The disadvantage, we already know, is servo interference and limited pitch ranges. The advantage is, linkage geometry is actually BETTER with the servo mounted on the outside. Another disadvantage to mounting outside the frame, setup is a MUCH more tedious and time consuming process trying to get +/- 12.5°. So many things need to be just right to make it work. I must've spent 20-30 minutes getting it right. Ironically, It probably would have been a 5 minute job start to finish had I just mounted the servo between the frames in the first place, but hindsight is 20/20. |
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03-02-2012, 07:52 AM | #68 (permalink) |
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You'll have to show me a picture that you're geometry is better. I prefer the links to point slightly outboard at the triple bellcrank to prevent them hitting the servo wheel.
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Chris D. Bergen Bergen R/C Helicopters |
03-02-2012, 04:36 PM | #69 (permalink) |
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Join Date: Aug 2009
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It's hard to get a camera in there for a good well-lit picture. I'll try to do that for you tomorrow.
I assure you the the link does not rub on the servo wheel. There is enough clearance to slide a credit credit card through the gap. I'm using the balls that came with the kit, the same screws, same double nut installation method as in the manual. The geometry makes it so the pushrods are very close to parallel with the frames. I'd say within 1° |
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