Rave Heiney TDX/HDX500 SAH on deck !

[Nick J]

Originally Posted by lonelasso

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

nvm

[lonelasso]

Originally Posted by Nick J

Helidirect also has the OEM hacker 8xl its a little cheaper I should have my SA very soon

Hiya Nick !

Really enjoyed the interview you did on www.Insideheli.com and the vid of you and your Trex 600 ! Awesome dude !! Will check on the Hacker !

-Dave

[Nick J]

Originally Posted by lonelasso

Hiya Nick !

Really enjoyed the interview you did on www.Insideheli.com and the vid of you and your Trex 600 ! Awesome dude !! Will check on the Hacker !

-Dave

Thanks man, yea I will be testing the hacker on 4s on the hdx500 sa and 5s on the se

[lonelasso]

Originally Posted by Nick J

Thanks man, yea I will be testing the hacker on 4s on the hdx500 sa and 5s on the se

Extra kewl !! Think I'll go 4s1p 4000 mah x 2. Wanted to try 3s2p using my TP 2100's, but they're getting kinda ragged and puffy (dumbass me...cut the balance connectors off ! ). They were always snagging on the MX frame..lol. Think I'd be happy with the Hacker then ? The Hyperion Z30 10T looks like a good motor also.

-Dave

[Nick J]

Originally Posted by lonelasso

Extra kewl !! Think I'll go 4s1p 4000 mah x 2. Wanted to try 3s2p using my TP 2100's, but they're getting kinda ragged and puffy (dumbass me...cut the balance connectors off ! ). They were always snagging on the MX frame..lol. Think I'd be happy with the Hacker then ? The Hyperion Z30 10T looks like a good motor also.

-Dave

Yea i think the hacker is more of 3s motor. But you can gear it anyway you want.

[lonelasso]

Originally Posted by kgfly

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.

Hiya Kenneth !!

Damn old timers disease set in and I didnt realize it was you following my thread ! My apologizes sir and welcome !!

-Dave

[BobOD]

Originally Posted by lonelasso

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

\

Later in that thread, Steve said 1.79kg was with the se frame. This one looks a lot lighter but noone seems to have a scale. I'll be getting my SA next week so I'll get the figure for you Kenneth.

[BobOD]

Regarding the hacker, I really like hackers but the 8xl is rated under 500watts while the hp z3025 is more like 700 watts. I ordered one of these for mine.

Kenneth, I'm getting the 3025-08 at 985kv. What pinion do you think I should use so I can run about 2100 to 2800 RPM by adjusting the throttle curves? I have a ph-80 so I figure I'll be able to run a low throttle setting without overheating it. Make sense?

[kgfly]

G'Day Dave.

Bob - First I should say that I am working from theory since I don't have an HDX500 of my own. I have a spreadsheet that will let you explore various power systems, PM me with your email and I will send you a copy. Here are some headspeed estimates for your setup:

Drive train parameters        Battery Parameters (V/cell)
---------------------------   ----------------------------
    Heli Model      HDX500                LiPo    LiFe
    Main gear teeth 94            Max     4.2     3.6
    Motor KV        985           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
-----------     -----------     -----  -------  ------  ----
    21              3           2495    2198     2080   1961
    22              3           2614    2303     2179   2054
    23              3           2733    2408     2278   2147
    24              3           2852    2512     2377   2241
-----------     -----------     -----  -------  ------  ----

The Hacker motors have a reputation for being conservatively rated. I know they are popular for QJ EP8v2 SP/EX which is much the same size and weight as the HDX500.

[lonelasso]

Originally Posted by BobOD

Kenneth, I'm getting the 3025-08 at 985kv.

Bob,
Are you gonna use 3S ? I was looking at this motor, but think I'm gonna do the Z3025-10T w/4S1P 4000 mah. Still not sure which pinion I'll need

-Dave

[kgfly]

Originally Posted by lonelasso

Bob,
Are you gonna use 3S ? I was looking at this motor, but think I'm gonna do the Z3025-10T w/4S1P 4000 mah. Still not sure which pinion I'll need

-Dave

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

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.

[HeliDirect]

Originally Posted by lonelasso

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

Dave,

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

Steve

[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.

[BobOD]

Weights.
Frame - 233g
Head Assy - 154g
Flybar and Paddles - 43g (I can't wait to wrap this around!!! Sturdy flybar.)
Gear/Clutch/Pulley Assy - 49g
Tail Boom and Braces and linkage - 58g
Fins and Mount - 20g
Canopy mounts - 6g (steel for some reason? not that much weight but I'm gonna remake from alum just on princepal)
Tail Assy w/belt - 52g
Canopy - 92g
Main Blades - 120g
Landing skid - 38g

Total - 865g

Could easily shed 60g with lighter blades (CF or Wood), and another 40 with a lighter canopy (only part of the kit I'm not happy with).
That would make it 765g!!!

[HeliDirect]

BobOD,

Did you get the yellow canopy? Did you get the frame SAS or SAH?

Steve