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Old Aug 18, 2007, 01:52 PM
Conformity Kill's
Mission Viejo, CA
Joined Nov 2005
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Steve,

if you can get a larger tooth count main gear in there (150 - 180) I'll buy two of them..one SE and one SA...No joke...

Geneween
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Old Aug 18, 2007, 02:03 PM
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United States, TX, Austin
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Quote:
Originally Posted by BobOD
I'm going to run the 3025-08 on 4s. Have an 18t, 21t and 24t to try.

Kenneth, I know you don't have the hdx500 but you have a lot of good analysis...which is very good for making decisions. Thanks. Will PM you for that spreadsheet.

BTW, NICE KIT!!! Just got the SA. It is impressive so far.
WTG Bob !! I havent been disappointed yet and the build is coming along pretty well.

-Dave
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Old Aug 18, 2007, 02:06 PM
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Quote:
Originally Posted by HeliDirect
Dave,

What servos screws did you have there? Did you use any washers?

Steve
Didnt use the washers Steve. The screws are black 1mm in length hex head. What size is the head ? I used the black allen wrench. I didnt have any problems with the servo bolts...it was the way the servo elevator servo is mounted (shaft pointed inward).

If the anti-rotation bracket is in front...it's the SAS frame ? I indicated several times that I intended to use Hitec servos....Sean understood this. I have no problem if it's the wrong frame..other than the tail servo mount location is to large for the HS-81. Are there any boom servo clamps available ?

-Dave
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Old Aug 18, 2007, 02:10 PM
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Quote:
Originally Posted by kgfly
Dave, It's usually best to get two or three pinions since theory and practice don't always align. I think that the Hyperion Z3025-10T is 815kv

Code:
Drive train parameters        Battery Parameters (V/cell)
---------------------------   ----------------------------
    Heli Model      HDX500                LiPo    LiFe
    Main gear teeth 94            Max     4.2     3.6
    Motor KV        815           Nominal 3.7     3.15
    Efficiency      90%           Loaded  3.5     2.75
                                  Min     3.3     2.3
---------------------------   ----------------------------

-----------     -----------     -----  -------  ------  ----
No of teeth     No of cells     Max    Nominal   Loaded  Min
-----------     -----------     -----  -------  ------  ----
    20              4           2622    2310    2185    2060
    21              4           2753    2425    2294    2163
    22              4           2884    2541    2403    2266
    23              4           3015    2656    2513    2369
    24              4           3146    2772    2622    2472
-----------     -----------     -----  -------  ------  ----
Depending upon what performance you are after, looks like 22t to 24t is the range to consider. If you are a 3D pilot then I suggest you start with the 24t and see how it goes.
In all the confusion.....I cant remember which is which any more ! The Z3025-8T is 987kv....and I think that's the one I want Gonna try a Revo 21T for starters.

-Dave
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Old Aug 18, 2007, 02:43 PM
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New York
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892 Posts
Yes, yellow canopy. Not bad but a bit thick...and screams for a paint job.
Got the SAH and it's all together waiting for electronics to arrive.
Again, very nice heli...good work.
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Old Aug 18, 2007, 03:53 PM
Tree Antagonist
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New York
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Dave, that's the arrangement Ifigure to end up with. 21T 987kv and I figure the top end will be 2775 loaded.
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Old Aug 18, 2007, 06:17 PM
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Quote:
Originally Posted by BobOD
Dave, that's the arrangement Ifigure to end up with. 21T 987kv and I figure the top end will be 2775 loaded.
Thx Bob !!

Think we'll both be in the same pen then...so to speak I'm a guinea pig according to my helicrack dealer !! I didnt pay enough attention to recommended servo for the tail and it cost me (1 HS-81 if any one is interested), so gotta look for the right one !

-Dave
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Old Aug 18, 2007, 07:37 PM
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Quote:
Originally Posted by lonelasso
Didnt use the washers Steve. The screws are black 1mm in length hex head. What size is the head ? I used the black allen wrench. I didnt have any problems with the servo bolts...it was the way the servo elevator servo is mounted (shaft pointed inward).

If the anti-rotation bracket is in front...it's the SAS frame ? I indicated several times that I intended to use Hitec servos....Sean understood this. I have no problem if it's the wrong frame..other than the tail servo mount location is to large for the HS-81. Are there any boom servo clamps available ?

-Dave
Dave,

The frame design for tail servos is that the right side frame can accomodate the S9650 servos and the left side frame can accommodate full size servos such as logictech 6100

They cannot work on those HS81servos.

The tail servo mount not yet available. I will check with them. Anyone else interested in mounting the tail servo on the boom?

Steve
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Old Aug 18, 2007, 07:45 PM
Suspended Account
Redding, Ca
Joined Nov 2005
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I am Steve. I like straight shot cf rod on the tail, less slop.
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Old Aug 18, 2007, 07:51 PM
Rcer field rep.
yucca valley, CA/// RCG
Joined May 2006
3,278 Posts
so you can't use hs81's in the heli? or just the tail?
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Old Aug 18, 2007, 07:53 PM
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Just the tail
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Old Aug 18, 2007, 10:19 PM
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United States, TX, Austin
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Quote:
Originally Posted by HeliDirect

Anyone else interested in mounting the tail servo on the boom?
YES

-Dave
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Old Aug 18, 2007, 11:10 PM
Rcer field rep.
yucca valley, CA/// RCG
Joined May 2006
3,278 Posts
yeah, a tail servo on the boom would be nice
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Old Aug 19, 2007, 12:40 PM
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moosemanty

what servos do you plan to use?

steve
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Old Aug 19, 2007, 02:55 PM
Rcer field rep.
yucca valley, CA/// RCG
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Quote:
Originally Posted by HeliDirect
moosemanty

what servos do you plan to use?

steve
i plan on using hs81's for cyclic, and a 9650 for the tail.
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