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Old Aug 16, 2007, 10:14 PM
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Melbourne, Australia
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Dave - That picture of the anti-rotation looks all wrong to me. Surely the ball should be on the outside of the pin so that you can put a link on it going down the the servo ? That is: Bolt->ball->pin->swash
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Old Aug 16, 2007, 10:23 PM
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Lonelasso's Avatar
United States, TX, Austin
Joined Dec 2006
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Quote:
Originally Posted by kgfly
Dave - That picture of the anti-rotation looks all wrong to me. Surely the ball should be on the outside of the pin so that you can put a link on it going down the the servo ? That is: Bolt->ball->pin->swash
The prob was--2 servos in front of the swash--one behind. No way to connect a linkage from anti-rotate pin/ball to front servos...savy ? I'm confident with the current arrangement and it'll be apparent when I get the servos installed and linkages connected.

-Dave
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Old Aug 16, 2007, 10:30 PM
Renewed interest
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Melbourne , Australia
Joined Jun 2002
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Dave your pic looks right now.
I was contemplating how to put into words what you have done. Couldnt find a clear way to describe it.

Now get it done and flying.
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Old Aug 16, 2007, 10:42 PM
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Quote:
Originally Posted by ozace
Dave your pic looks right now.
I was contemplating how to put into words what you have done. Couldnt find a clear way to describe it.

Now get it done and flying.
Thx Oz Yeah...I had a hard time finding the words too !! Gotta find a good motor before I can try er out.

-Dave
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Old Aug 16, 2007, 10:53 PM
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Melbourne, Australia
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Oh I see, so initially you were using the wrong arm on the swash for the antitrotation pin and the swash had to be rotated 180deg. Now I see it in the photos, thanks.
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Old Aug 17, 2007, 02:45 AM
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Dave,

you got everything straight?

Steve
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Old Aug 17, 2007, 04:24 AM
Trial&Error - Repeat
Rollingball's Avatar
Amsterdam, New York
Joined Feb 2007
3,270 Posts
Quote:
Originally Posted by lonelasso
Best I can do for weigh after I've got it all together (need scale !).

Here's Steves post : "total weight including the 4000mAh 15C 4s1p battery and fiberglass canopy is 1.79kg. "

Using
Hitec HS-85 x 3 HS-81 Tail
Align 75A ESC w/o bec
Park 5v bec

-Dave
3s1p TP 2100 x 2 parallel
Looking for the hdx500 850jv...no luck yet
Looking at the specs from HD the 850 motor is a 4S-6S input plant. Would 2 3S in parallel be too low voltage for operation?
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Old Aug 17, 2007, 06:38 AM
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Depends what headspeed and overall performance you want. For learning/cruising 3s with a 24t pinion will give you around 2200rpm which should be OK although the motor will be fairly heavily loaded. For 3D then no, you will need 4s or 5s to get the performance out of an 850kv motor or else stick to 3s but change to a motor something over 1000kv like perhaps a Hacker A30-8XL (37mm, 177g, 1100kv = ~21-23t), AXI 2826/8 (35mm, 181g, 1130kv = ~21-23t) or a Z20 (43mm, 210g, 1470kv = ~18t)
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Old Aug 17, 2007, 07:53 AM
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United States, TX, Austin
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Quote:
Originally Posted by HeliDirect
Dave,

you got everything straight?

Steve
Yes Steve...I think so...so far. The HS-85's fit, so no problem there.
I did notice that the tail fin (vertical) is kinda flimsy...will there be a g-10 fin ? Also...any idea on when the HDX500 850KV will be available ?

-Dave
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Old Aug 17, 2007, 04:50 PM
Trial&Error - Repeat
Rollingball's Avatar
Amsterdam, New York
Joined Feb 2007
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Quote:
Originally Posted by kgfly
Depends what headspeed and overall performance you want. For learning/cruising 3s with a 24t pinion will give you around 2200rpm which should be OK although the motor will be fairly heavily loaded. For 3D then no, you will need 4s or 5s to get the performance out of an 850kv motor or else stick to 3s but change to a motor something over 1000kv like perhaps a Hacker A30-8XL (37mm, 177g, 1100kv = ~21-23t), AXI 2826/8 (35mm, 181g, 1130kv = ~21-23t) or a Z20 (43mm, 210g, 1470kv = ~18t)
Ok I was wondering about lugging the motor, so until I replace some of my 3S packs to 4S, I will run 2 2100s in series for 6S.
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Old Aug 17, 2007, 05:03 PM
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AFAIK the smallest pinion you can get is an 18t Lepton pinion from RevCo. For an 850kv motor on 6s that will put you in the range of about 2500-3800 rpm depending on throttle setting. I wouldn't go below 85% throttle or you are likely to get excessive heating of the stock ESC and the motor. At 85% you should get around 2700-3300rpm on 6s/18t. You will also need to make sure that your BEC is rated for 6s, most of the cheaper switched-mode BECs are only rated to 5s. A SportBec ( http://www.dimensionengineering.com/SportBEC.htm ) will be OK, or if you prefer there is a 3.5A HV BEC from Medusa Research or a 5A Hercules BEC from Western-Robotics.
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Old Aug 17, 2007, 05:19 PM
Trial&Error - Repeat
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Amsterdam, New York
Joined Feb 2007
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Quote:
Originally Posted by kgfly
AFAIK the smallest pinion you can get is an 18t Lepton pinion from RevCo. For an 850kv motor on 6s that will put you in the range of about 2500-3800 rpm depending on throttle setting. I wouldn't go below 85% throttle or you are likely to get excessive heating of the stock ESC and the motor. At 85% you should get around 2700-3300rpm on 6s/18t. You will also need to make sure that your BEC is rated for 6s, most of the cheaper switched-mode BECs are only rated to 5s. A SportBec ( http://www.dimensionengineering.com/SportBEC.htm ) will be OK, or if you prefer there is a 3.5A HV BEC from Medusa Research or a 5A Hercules BEC from Western-Robotics.
Yeah my phoenix 60 has the beef for the battery side and motor side of things.
I do have the SportBEC installed and also have the 18t RevCo.

I wanted to get the Hacker motor but I forgot about it when I ordered the heli. Oh well maybe someday when I get tried of the HDX motor.
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Old Aug 17, 2007, 05:25 PM
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Joined Nov 2005
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this is Another version of the frame ! one the antoritation is in the front and olher is in the rear ! I prefer the Helidirect version antirotacion on the back with the elevator servo like thr t-rex SE


nUnO
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Old Aug 17, 2007, 07:25 PM
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United States, TX, Austin
Joined Dec 2006
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Servos installed !

Just quick update ! HS-85s are installed Had a little issue with the rear one as it's installed 'backwards', I had to trim the little supports off the mounting ears. They caused the bolts to lay over and I was concerned about the servo coming loose...not a good thing Also...the HS-81 will not fit in the frame (opening is too large), so I'll get some cnc servo mounts for the tail boom.
Leaning towards the Hacker A30-8XL per kgflys experience ! THX man !

-Dave
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Old Aug 17, 2007, 07:28 PM
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Pasadena, CA
Joined Jan 2007
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Man, this is not bad looking for an SA kit.
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