my 3dx500

[BobOD]

Hi ya Bob, The kora Rocks! I use Max Amps 4000 4s packs, 24tooth revco pinion medium timing on the stock hobby wing ESC and turn a 3000Head Speed for about the first 3 min of flight. With lite 3d expect a 6 min flight. Don't take my word for it, talk to John at Ready Heli.com and ask him about this particular motor. Every item I own from Kontronic, has never failed me and I love it........................

OK, I found the specs on Kontronik's site. There's a graph of rpm vs max continuous input power. Nice information actually.

So, at 3000 HS 94:24 = 11750 motor RPM
According to the graph, the max rating at this rpm is about 470 watts. At 4s, that would be averaging about 32 amps which is close to (maybe a little lower than) what I've heard. 6 min flight on 4000 4s also confirms this. Rudy, any chance you can confirm the amp draw? Anybody have a data logger on one of these? In any case, looks like a decent fit after all. A little close to the limit but only 150 grams!!!

One last note. For hard 3d lasting only 3 minutes, that would indicate much more (like double) power draw. Say 60 amps and 900 watts. Now you're way over the rating. But, for only three minutes, so it might work out. I would not beleive that motor comes down cool after that.

[Rudy C]

Hi Guys, Ihave many flights on my Kora 15-12 using 4s 24tooth. I still love this motor. The kora gets hot but nothing like the original Sonix motor. I don't know the current draw but I can give u some temps The outside air temp has been hot down here in North Carolina - mostly 95degree (F) the motor after 6min is 150-160F Batteries come in at 125(f) esc @110. Plenty of power. John at Ready Heli states: Most all of his Hirobo Lepten customers buy only the 15-12 motor. The Kv to power just make it right! Please bear in mind that the HDX/500(3DX500) come in at almost 1POUND heavier than the Lepton. The motor works harder on the HDX500. HeliDirect says they are comming out with a Lighter SA (plastic Head&Tail) and also a lighter direct servo frame. I can't wait! It flys well now, very stable. I know it will fly better lighter. I also heard that they may make a larger main gear with more teeth. This is also a good thing whereas we can use many other power options. Just have to wait and see. At least they are upgrading versions which is a good thing. As stated in previous threads, If u plan to stay with this bird, you wont be sorry putting a Kora motor on it. It has alot more power than the Hacker A30/10 or the Hyperion Z30 which are basically the same motors with a slight edge to the Hyperion. I have all three, and the Kora delivers the most bang for the buck! U get what u pay for.......

Joe in Salzburg, my HDX500 comes in at almost 4 pounds! I don't consider this heli a 3cell bird. When I first set it up I used 3s 4000 cells and all I would do was hover it. Put 4s on it and now it has spark simular to my Logo103d on 6s or like the Trex450se on 3s.

Just my opinion! but of course everybody has one hahahahahaha bye for now and spend lots of money and fly safely..

[BobOD]

Rudy, how do you know the lepton only weighs 3 pounds (1363g)? That's a pretty dramatic difference and, if true, I'd spend the extra money on the lepton in a heartbeat. I can't find any verifiable information on this though (note: manufacturer spec = unverified...or in other words...a lie). A few have verified 4 pounds (1820g) for the hdx500 so I believe that one.
This is important because if a kora 15-12 works well on a 3 pound heli, I would not expect it to be good for a 4 pound heli.
Sorry for all the disbelief, it all just doesn't seem to add up for me.

[Helibelly]

According to Hirobos website, the Lepton weighs 1600 g. I would imagine thats with the supplied 4 cell 3200mah battery which is probably smaller than most people use. Allowing for this and that a few have verified 4 pounds (1820g) for the hdx500, the weight difference is more like around 150g or so, less than half a pound I would think. Most of this is due to extra bling, which most people don't complain about.

[Rudy C]

Rudy, how do you know the lepton only weighs 3 pounds (1363g)? That's a pretty dramatic difference and, if true, I'd spend the extra money on the lepton in a heartbeat. I can't find any verifiable information on this though (note: manufacturer spec = unverified...or in other words...a lie). A few have verified 4 pounds (1820g) for the hdx500 so I believe that one.
This is important because if a kora 15-12 works well on a 3 pound heli, I would not expect it to be good for a 4 pound heli.
Sorry for all the disbelief, it all just doesn't seem to add up for me.

Bob, You are correct! I exaggerated in the weight. It is actually about 350 grams lighter. Look at all the threads concerning weight difference. The HDX/3DX fly heavier. If u can hold off for awhile wait and see what the weight difference will be on the HDX500 SA model. It is supposed to be lighter than the Lipton. My Hdx comes in at 1920G and guys who own the Lipton say their's is 1600+/-........Sorry for the incorrect info. The thing that scared me away from the Lepton were the parts prices. (wow) Been there done that with the Logo. It's just me , penny wise and pound foolish! I like the HDX, but I'm sure I would of loved the Lipton. Let us know what u decide to do. Just as long as u spend, spend, spend! HaHa

[BobOD]

Just as long as u spend, spend, spend! HaHa

ARGH!!! Got me with that one. DARN IT!!!! Where's that "BUY IT NOW" button?
Yeah, that's what I'm doing...waiting for the unblinged version. I started with the Trex450XL, then blinged it and then unblinged it. I didn't feel the weight was worth it. Actually, I wound up with metal levers and outer swash ring. Those were worth it. I run 3000rpm and have been throwing it around for 6 months and no failures.

Anyway, I really hope the HDX500SA comes in at or below 1600g otherwise the disk loading and power to weight ratio don'tlook so good for me.

[rotodingo]

Bob, You are correct! I exaggerated in the weight. It is actually about 350 grams lighter. Look at all the threads concerning weight difference. The HDX/3DX fly heavier. If u can hold off for awhile wait and see what the weight difference will be on the HDX500 SA model. It is supposed to be lighter than the Lipton. My Hdx comes in at 1920G and guys who own the Lipton say their's is 1600+/-........Sorry for the incorrect info. The thing that scared me away from the Lepton were the parts prices. (wow) Been there done that with the Logo. It's just me , penny wise and pound foolish! I like the HDX, but I'm sure I would of loved the Lipton. Let us know what u decide to do. Just as long as u spend, spend, spend! HaHa


Hello,

My Lepton weight is exactly 1616g ready to fly. With 3* Futaba 3150, Graupner DS3781 (metal gear) on the tail, GY-401, Jazz 55-6-18, Futaba 146iP receiver, Kora 15-12 motor and 4s 3700 Hyperion batt.

Nicolas

[BobOD]

Steve just stated 1790g for the sa version in a post on RCGROUPS. Didn's say which battery though but I'll assume is was similar to a 4s3700. I assume he has a 185g motor vs the 150g kora. So, the SA is still 140g or so heavier. Not so bad now but darn it...could get a couple extra cells for the weight diff.

[Heli Joe]

Hi Rudy !!!

News from Austria / Salzburg !!!
I still have also a Kora 15/12 in my HDX500 and also a Logictec 2100T Gyro. Thats such a big different like before.... The Motor is great and powerful and with my 4000 mAh 4S Lipo it works very very well. The Logictec 2100T Gyro is also very very perfect.... I think it is better than the 401 from Futaba...!!!!
How are you everthing ok with you ??? Here in Austria its gooing cold now and thats not the best thing for flying but its ok. I have also a new TRex 450 SE V2 - and its also really very nice. Very very nice....
Cheers from Austria
Joe

[ml]

Some Pics Of My 3dx500 Converted To Hdx500

[Heli Joe]

Looks great !!!

Which blades are you using ??? They looks a little bit longer than 425 mm ???

Cheers from Austria

Joe

[ps61785]

how does it fly now that its converted to the HDX500

[aussiemick]

how does it fly now that its converted to the HDX500

I don't know about ML's setup but I started out with the HDX and converted to the 3DX and would not go back to the HDX at this stage. The cyclic is much better on the 3DX head, it is after all a direct copy of the lepton head. I had done as much as I could to the HDX head to make it more responsive but it was like :arggg:

Mick

[ml]

HI, Heli joe

Thanks. This is 425mm Carbon Fiber Blades come from Heli Direct. It's only the effect of the picture.Work very well on the 3dx and have a excellent tracking,and a very nice finish.

Hi Mick, Yes it's true, but, i have more pitch +10 and -10 with hdx head than the 3dx head and i'm not a 3der, but i prefer the hdx head (like a t-rex) and the 3dx head have a little problem with the lower collective stick.(the swash rob and touch the main collar at full cyclic to +8 degree at ccpm interraction) This is my reason to change the head for hdx.

And another things, i change my Vertical tail fine for the tail blades, it's more longer. My tail blades have 70mm now, i have more response than the old one.

Landing guear is a aluminium and i can adjust the higher for cg center.

air brush fiber glass canopy

for the rest, full 3dx

Martin Better salutation for Australia People and N.Y. USA

[ml]

Also

Gy 401

Brushless Hyperion Z-3025 815KV

work very well

Martin

[BobOD]

I don't know about ML's setup but I started out with the HDX and converted to the 3DX and would not go back to the HDX at this stage. The cyclic is much better on the 3DX head, it is after all a direct copy of the lepton head. I had done as much as I could to the HDX head to make it more responsive but it was like :arggg:

Mick

You just need upgrade parts like these and then it's much better than the 3DX/Lepton type.

[aussiemick]

You just need upgrade parts like these and then it's much better than the 3DX/Lepton type.

Where did you get these parts from?
Mick

[BobOD]

I made them. Tweaked the design to give much better cyclic....amongst other things.

[ps61785]

i know that helidirect sells longer mixing arms and washout arms...would this help the cyclic responce at all?

[aussiemick]

I made them. Tweaked the design to give much better cyclic....amongst other things.

What are the litlle arms, with the three holes in it, for?

Are these arms purchasable??

Mick

[BobOD]

OOPS, I guess I lost track of this thread.

The little levers are for the tail slider. Whoever designed the HDX500SA messed up the pitch travel so I made them shorter to give a better pitch range.

I haven't tried mass production...just a hobby. Countless hours go into making the first couple so I wouldn't be able to earn a living unless there was a bigger market.

[aussiemick]

BobOD
PM received thanks

Ah now that makes sense.

After shortening the pitch arms for tail at full right rudder (leading edge control) do the arms threaten to click over centre and lockup??

Mick

[BobOD]

BobOD
PM received thanks

Ah now that makes sense.

After shortening the pitch arms for tail at full right rudder (leading edge control) do the arms threaten to click over centre and lockup??

Mick

Nope, good one to watch out for though. I've seen that on some tails. Doesn't make for good flight chacteristics. :eek:

They are 8.5mm center to center and centered slider coincides pretty close to hover pitch...still a tad off so I'll probably tweek a bit more some day. I'll have to watch for the over center issue...good tip.

[aussiemick]

Nope, good one to watch out for though. I've seen that on some tails. Doesn't make for good flight chacteristics. :eek:

They are 8.5mm center to center and centered slider coincides pretty close to hover pitch...still a tad off so I'll probably tweek a bit more some day. I'll have to watch for the over center issue...good tip.

If you are after a Beta tester for the HDX parts I would be very happy to volunteer :lol:

Mick

[WillJames]

You just need upgrade parts like these and then it's much better than the 3DX/Lepton type.

There is a much more simple and less time consuming answer to getting all the pitch range and cyclic you could possibly want. Coming soon the Rotorworkz upgrade pats kit for the HDX500. Should not be much longer now.