Target headspeed

[laughingstill]

What headspeed you guys running in the Trex 600E?

[Showstopper]

I am running a 2150RPM head speed on my Trex 600. It has good pop and I can pull 12 and -12 easily. very powerful heli. ( by the way I know that the headspeed does not mean a lot of power nor does it have anything to do with how much pitch I can pull)

[sprice50]

Mine hauls, but not sure what it is running. 6S with higher KV align motor and pinion is one tooth higher than stock to increase rpm even more. I run it at 75-95% throttle in idle up. It hauls!

Any guesses on rpm?

[sherman89]

2180 with stock motor and a 10T at 90% flat throttle line tached on the ground at zero pitch.

[jones007]

The "right" headspeed depends on what you're trying to do. If you're learning to hover, then 1700 to 1800 is a good speed. You'll get longer endurance on a pack and if you crash you'll have less energy, so typically less damage. When you start forward flight I'd bump it up to 1900-2000 (in idle up). The higher tip speed reduces retreating blade stall. When you fly 3D I think most people run between 2100 and 2200. I get about 2200 at the beginning of a flight, and after 5 minutes it's usually dropped to about 2100.

Hope this helps.

--Kevin

[Ogre55]

Running 2150 and 2300 on mine.
I have another 600 in the works with two 7s A123 packs (in series) and a Scorpion HK 4025-630KV with a 15 tooth pinion that should give me 2300 to 2500 RPM head speed.
That should have some pop.
:clap:
Mark

[jones007]

Running 2150 and 2300 on mine.
I have another 600 in the works with two 7s A123 packs (in series) and a Scorpion HK 4025-630KV with a 15 tooth pinion that should give me 2300 to 2500 RPM head speed.
That should have some pop.
:clap:
Mark

I thought 2200 sounded a bit scary - 2500 has to be outrageous on a 600. ;) That's a tip speed of about 175 m/s or about 400mph! Check those feathering spindle bolts regularly. ;)

--Kevin

[ericb]

Running 2150 and 2300 on mine.
I have another 600 in the works with two 7s A123 packs (in series) and a Scorpion HK 4025-630KV with a 15 tooth pinion that should give me 2300 to 2500 RPM head speed.
That should have some pop.
:clap:
Mark

Holy crap. That should be very responsive.:)

[Ogre55]

So I've heard! Yup, a flying lawnmower.
Just don't know how long she'll stay in the air on the A123s,
M

[jones007]

You definitely pay for headspeed, endurance-wise. Drag increases as velocity squared, so going from 2200 to 2500 headspeed should draw about 30 percent more power. Not exactly right, as you'll be at a slightly smaller pitch, but a fair initial estimate.

--Kevin

[Ogre55]

That headspeed calculation is for no load, I am sure that the realistic headspeed will be closer to 2250 or 2300 RPM. Still quick.
M

[Lemmiwinks]

You definitely pay for headspeed, endurance-wise. Drag increases as velocity squared, so going from 2200 to 2500 headspeed should draw about 30 percent more power. Not exactly right, as you'll be at a slightly smaller pitch, but a fair initial estimate.

--Kevin

The drag will be 30% greater, the power required will be 47% greater since its proportional to the cube of the head speed.

[RCSavager]

That headspeed calculation is for no load, I am sure that the realistic headspeed will be closer to 2250 or 2300 RPM. Still quick.
M

Not really, I have tach'd my blades in flight as well as monitored them with EagleTree. My headspeed is ~2570rpm so I can see his 2500 easy enough. I run 15T pinion @ 100% TC as you simply can't bog my motor anyway. Let me tell you, it's a BLAST to fly.

EagleTree (http://picasaweb.google.com/lh/photo/Yu95PI6zKoaIjpa2DJI2UA?feat=directlink)

LA3D 600ESP 12S Hacker A50-12L (http://www.youtube.com/watch?v=tMjxSgiG52U) (5 min 57 sec) (5 min 57 sec) (5 min 57 sec) (5 min 57 sec)