HDX500SAH Maiden

[blueprint]

I received the HDX yesterday afternoon and I finally got it together and finished her up earlier this morning. It was a straight forward build but i did take precautions and re-did the head and tail and added some locktite for peace of mind. It went smoothly but there were a few modifications i had to make such as the motor mount elongation. overall i am pleased with the helicopter and it's performance. Here is my current set up.

HDX500SAH
HS-85MG 3X
Pentium 80A ESC
GY401 Gyro
9650 Servo
AR6100E RX
Hyperion 815KV Outrunner Motor
Align 16T TREX500 Pinion
2 3S 2200 Batteries.

I am still doing more research on a good BEC for my setup but temporarily im running an Align step down BEC with a 2S 600MAH battery. The helicopter is still lighter than my buddies TREX500. It works but i'd really like to shed more weight as im just doing hovering/ff and stall turns.

I've narrowed the choices to the SportBEC 5/6V or a Medusa 3.5A/6V BEC. While i wait i'll continue using this setup.

Overall the Maiden went extremely well and the helicopter is stable. I did some slow FF, hovering and stall turns and all is well. Great helicopter at an awesome price. Still cleaning up the wires but here she is:

TREX450SE and HDX500
http://img.photobucket.com/albums/v493/blueprint012/HDX/Picture001Small.jpg

http://img.photobucket.com/albums/v493/blueprint012/HDX/Picture014Small.jpg

http://img.photobucket.com/albums/v493/blueprint012/HDX/Picture007Small.jpg

http://img.photobucket.com/albums/v493/blueprint012/HDX/Picture012Small.jpg

http://img.photobucket.com/albums/v493/blueprint012/HDX/Picture009Small.jpg

:D

[taildriven]

Any problems with the stock 94T main gear stripping with 22.2V?

[lotus7]

Any problems with the stock 94T main gear stripping with 22.2V?

My little engineering brain tells me a smaller pinion should impart less torque onto the main gear - smaller radius , less leverage , less torque .
Motor rpm will be a lot higer though
In motor racing I was taught that that it is torque that breaks gearboxes, not horsepower or rpm's

[lotus7]

Blueprint
I am running the same Hyperion motor - H-3025 10T as you in my HDX500SE, bur running 24T pinion with 4S 4000 lipo's and Hobbywing 60A ESC
I was investigating going onto 2 x 3S 2200 lipos with the 16T pinion but I was led to believe the motor will not take 6S i.e 2 x 3S .
Can you please give me some feedback - got some 3S lipos left over from my HDX450 days



. Here is my current set up.

HDX500SAH
HS-85MG 3X
Pentium 80A ESC
GY401 Gyro
9650 Servo
AR6100E RX
Hyperion 815KV Outrunner Motor
Align 16T TREX500 Pinion
2 3S 2200 Batteries.
:D

[falconea45]

Lotus 7 That motor is only 2-4S according to Hyperion data sheets. Might run ok but for how long.

[taildriven]

My little engineering brain tells me a smaller pinion should impart less torque onto the main gear - smaller radius , less leverage , less torque .
Motor rpm will be a lot higer though
In motor racing I was taught that that it is torque that breaks gearboxes, not horsepower or rpm's

You have the first part backwards. The torque depends really on gear ratios. The smaller the driver gear (pinion) the more torque (for a given main gear).
It is power is constant but power = torque x speed. For a give motor RPM, the smaller pinion will turn the main gear more SLOWLY but INCREASE the torque (higher mechanical advantage) but power will be constant
A larger pinion will do the opposite.

Sorry for the lesson

You are right about torque ripping gear boxes apart (not speed) provided the motor has enough power to produce the torque to begin with.

I think the problem with the HDX is that it really wasn’t designed for 6S and ging to a 15 tooth pinion just provides way too much mechanical advantage over the weak 94T main gear.
I can run the heli OK if I keep the throttle within reason (70% max) and be careful to use a soft start. I will try a 17 tooth pinion and see if this helps (if I can find one). That should increase my headspeed and reduce the torque on the main gear

[lotus7]

I am quite happy with the 4s setup , but sadly between 3 of us here in Cape Town flying the 500SE , we have had at least 5 or 6 main gears stripped in 5 months . Easy flying , no attempt at 3D yet.

Secondly, my only problem is availability of decently priced but reliable 4S lipos here. We bought the Helis with Megaforce batteries and all of the original 9 ( 3600mAh and 4000mAh) puffed . All replaced under warranty, but still .

Also with the 6S setup , the motor will do crazy rpms, and quite correctly Hyperion specify only 2S to 4S.

[tom]

Buy the lipton main gear from H.D. it is a lot better $14

[lotus7]

Buy the lipton main gear from H.D. it is a lot better $14

I am running one now - bought from the S A agent of Lepton - double the price of HDXor Microheli !
Lets hope it last at least double the time :hammer

[aussiemick]

I bought two lepton main gears and I can get them to strip as well (and have) at the drop of a hat.
We need bigger main gears.

Mick

[falconea45]

Well the new frames were on HD's site but they have disappeared so I hope they are just waiting for the 140T gears. I'm lucky as I have a 120T delrin gear and a 130T on the way, then I will get the 140T when it arrives.

[lotus7]

. I'm lucky as I have a 120T delrin gear and a 130T on the way, then I will get the 140T when it arrives.

Would not mind a 120T as I can then still fly 4s - got enough lipos - With 140T it is 6S or go home IMHO - 4s will need a 34 T to 36T pinion on 140T

What 120T gear is that - is it also mod .6 like the HDX / Trex500. can you give a diameter measurement ? It is easy to modify the frames and motor mount for 120T
Can easily fit the trex450 main gear

[falconea45]

The gears I have were made by a guy in the UK. He is not selling them to every one as he only makes them for himself and has a couple over. The 120T is about 73mm diam and you can file the frames to fit it.
What is that about fitting TREX450 gears, a bit fragile I would think and I don't think they are the correct mod ie.6m

[falconea45]

I used to live in Johannesburg but never got to Capetown

[taildriven]

I am running one now - bought from the S A agent of Lepton - double the price of HDXor Microheli !
Lets hope it last at least double the time :hammer

Yep..that was my next move. Once it gets here I'll try it out and see if that works. It's an upgraded main gear made of delrin. Let's see.