3DHS 70" Velox

[Enterprise]

Tell me it is the red white blue one. I wish EF would make something with that scheme.

 

[Only Fine Helis]

Yep, red white and blue.

 

[ryan_m]

I know someone with a red/white/blue EF 88" Extra for sale... If you can figure a way to get it from Arkansas to wherever you are you can have it at a great price. DLE-55 in it, HS 7955's all around I think.

 

[gyro]

I know someone with a red/white/blue EF 88" Extra for sale... If you can figure a way to get it from Arkansas to wherever you are you can have it at a great price. DLE-55 in it, HS 7955's all around I think.

How much?

 

[ryan_m]

1100 including all but rx. Has 2 li-fe flight batts that are less than a year old. Has some nice vinyl on the wings too.
Price may be a bit negotiable, not sure. He bought it from me at that price when I sold it to get your 87" SHP

 

[Only Fine Helis]

I guess I got a pretty good deal with mine since I got it with receiver included and a nice wing bag for less than half that!

 

[Only Fine Helis]

HELP!

Ok guys, we maidened the 70 Velox today and it was kind of a good news, bad news thing.

Setup is with a Graupner MZ24 radio, Hobbywing 100A Platinum V3 ESC, Kingmax servos, 19x8 Xoar prop, and Hacker A50 14S V3 motor with the servos in the tail to balance it out instead of using the pull pull setup.

First the good news.

My 8 year old son Caleb did the maiden and he got it up in the air and after 3 clicks of down elevator, everything was flying perfect. We were pleased with the power, flew very neutral upright and needed only a tiny hint of elevator to keep it in the air inverted in both high speed and low speed maneuvers. Was very stable and we were all happy.

I put in the second battery and turned him loose on high rates and he put it to it. When it came down I checked the battery and we got almost exactly 6 min out of it leaving 20% in a 6s 5000. I noticed the motor was pretty hot so I let it cool for a minute and then we put in the third battery.

Well, about 2 min into the third flight we started seeing smoke and he started loosing power. Thankfully, he was doing some slow maneuvers close to the ground because by the time he got it down he almost had no power at all. I ran over to the plane wondering if a battery had gone crazy or something, but it was the motor that was letting out the "magic smoke". The prop nut was so hot that it would burn you instantly on contact.

So - what in the world is going on? Everything seems to match up as far as components go. I am going to call aero-models when they open to see if they have any ideas.

Thanks!
Shannon

 

[njswede]

You're running WAY too much prop for that motor. According to the Hacker site, it's designed for a 16x8-16x10 propeller and you're running a 19x8. Also, the motor is too weak for that plane. It's rated for 1250W. A plane that size needs around 2000W-2500W to fly well.

 

[Only Fine Helis]

3dhs recommends the Hacker A50-16S with an 18x10 so I didn't think the wattage would be that far off, even though my motor is a 425kv vs the recommended 365kv with the 18x10.

 

[gyro]

Shannon, hacker motors tend to run slightly on the warm side anyway, so pushing more watts through one than designed is almost guaranteeing trouble... Sorry

My recommendation: when using a motor/prop combo different than what is advertised on the vendor website, it is a MUST to test it out with a watt meter first and verify you aren't exceeding the design limits.

I'm not a heli guy, but I'd ask this anecdotally: if you change from the manufacturer recommended 21T pinion to a 22T pinion on a motor, could you overheat it?

Good luck getting your Velox fixed and flying again soon, it's an amazing plane!