Is it longer flight times with Compass?

[Racing_]

Hello.
Is it longer flight times on Compass 6HV (12s) helicopters vs Align T-rex 600 (12s) ? Or is it equal?

Regards

[myrseth]

Its longer if you do not modify the trex, trex is made to run silly high headspeeds or the tail don't work and silly headspeeds eat flight time.

In general with same headspeeds and blades they should be about the same.

[TheBum]

Originally Posted by myrseth

Its longer if you do not modify the trex, trex is made to run silly high headspeeds or the tail don't work and silly headspeeds eat flight time.

In general with same headspeeds and blades they should be about the same.

I suspect the 6HV will still fly longer due to its low weight. I would be surprised if you could get a T-Rex down to the 6HV's weight.

[myrseth]

Marginally, 2700 hs requirement makes for 2-3 min flights and at that headspeed if compared I doubt youdd see a much of a difference.

Maby if you get a more normal headspeed where you get 5-6 min flights you would notice it.

[skunkworx]

You have two major things to consider. As mentioned, headspeeds #1, and #2 weight. There's no cheating either one. If you run higher speeds, you get lower times unless you run bigger packs. The heavier your machine is, the harder it will be to lug around the weight and would be somewhat counter-intuitive. As mentioned, the Trex usually requires much higher headspeed to get good performance where the 6HV will do great on just about any headspeed you run it at, so that's a possible tipping point.

All things being equal though (outfitted exactly the same), I would say the 6HV would run longer due to smaller weight and lower drag coefficient (smaller profile). Lastly, because you likely can't get the gear ratios to be exactly the same, it could push one over the top compared to the other because it *could* be working in that particular setup's power band where it wouldn't be on the other helicopter. It's really tough to say without having a whole lot of scientific process introduced to keep all factors on the up and up. Not to mention there's a little bit of admitted bias because you asked in this particular section.

[John Cook]

most guys will find similar flight times. Most guys setup the Trex or 6hv for more of a sport/mild 3d setup. In that guise, they will be similar times, all other things being equal. Blades, battery, etc...

Now, the above posters are correct as far as I know. The Trex 600 is meant to run super high headspeeds and has a lower tail gear ratio to reflect that. If you are a balls out 3d master, then yeah the 6hv will probably get longer flight times, as you don't need silly high headspeeds to get good tail performance.

Again, I feel this information is accurate, but you are asking this question on a Compass forum, so take each piece of advice with some grains of salt . We love our machines and are biased to that fact

[lazor 22]

Well me and my friend (has a 600 pro efl) get the same flight time 3:30. He is running 2300 I think and I have 2250. I think I might push it a little harder so that would make since. So no the difference is not that much.

[myrseth]

Lazor what batteries are you using? Seems a tad short for the 6hv

[lazor 22]

It does... especially because people reporting much longer flight times with the exact same setup, and faster headspeeds. But I have checked out everything is ok.

Gens ace 3300 25c

[emberjelly]

Originally Posted by lazor 22

It does... especially because people reporting much longer flight times with the exact same setup, and faster headspeeds. But I have checked out everything is ok.

Gens ace 3300 25c

Seems very short, how much do you remove from the packs?
I get 6 min of sport flying with 2800 30c packs, and remain within the 80% limit

[rallyant]

Originally Posted by lazor 22

It does... especially because people reporting much longer flight times with the exact same setup, and faster headspeeds. But I have checked out everything is ok.

Gens ace 3300 25c

Wow, something is not right there! I get 6min of abuse on 2150 with 3300 gens ace packs with 25% left
I'm amazed at how nice it is to fly on lower HS and 10minute flights too!


Sent from my Galaxy Nexus using Tapatalk 2

[John Cook]

I get about 4 mins, but flight time will just depend on how much you are drawing on the packs. IE how hard you are flying. Eric Brandenburg can lay some hurt down on flight packs. Me.. not as much lol, but moreso that the average guy. If you are heavy on the collective your flights times will suffer. Assuming everything else is ok, Lazor's flight time isn't that horrible. He's pretty pitch intensive from what I recall in vids.

[skunkworx]

Even then, I did a full flight of non-stop tic-tocs and huge loops and still barely pulled down more than about 2400 on my packs at over 4:30. Something doesn't seem right there. Gear mesh and/or tail belt tension too tight? All stock, 100% throttle and 10t pinion you'll be pushing 2300rpm headspeed. Anything lower than that and you won't be drawing down nearly as hard I wouldn't think?

[Rob43]

The relationship between flight time and headspeed isn't linear either. That is, for example, a 10% increase in headspeeds over 2000 will shorten effective flight time significantly more than 10%. It's because the horsepower input for the same pitch is proportional to the square of tip speed. Additionally bigger blades will also draw along the same lines of proportionality with respect to power consumed, since rthe tip speed increases with blade length, for the same shaft speed. 3:30 seem painfully short to me as well. Running around 2200, but not flying quite as hard as the Lazor man, I can easily fly to 6:30 with 25% left in even my well-used Nano 25C 6S3000 mah packs, or my well-used Punch 50C 6S2650 packs.

[lazor 22]

Mesh if anything is to loose, and belt tension is pretty tight, but any looser and I was getting a 90-180o blowout every now and then. I would sure love to get 5-6 minute flight times

[alexmit]

The stock motor gave me about 5 minutes of flight time on 3000 or 3300 mah packs. I now have a Hyperion 4035-560 in it and get about 4 minutes exactly with 20% left banging on the heli the whole time.

[emberjelly]

Originally Posted by lazor 22

Mesh if anything is to loose, and belt tension is pretty tight, but any looser and I was getting a 90-180o blowout every now and then. I would sure love to get 5-6 minute flight times

Lazor, perhaps its worthwhile seeing how much flight time you get just doing light sport flying, or even just hovering doing nothing.

If you get 6-7min then nothing to worry bout.

Although this idea sounds kinda boring...

[rallyant]

I dont know if it was the new packs (gens ace 3300) getting better after a few flights or turning off the Gov and setting up a shallow V curve? but i only pulled 1960mh after hard 6 minute flights today @ 2145


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[alexmit]

Originally Posted by rallyant

I dont know if it was the new packs (gens ace 3300) getting better after a few flights or turning off the Gov and setting up a shallow V curve? but i only pulled 1960mh after hard 6 minute flights today @ 2145


Sent from my Galaxy Nexus using Tapatalk 2

Any governor eats amperage trying to hold the headspeed. I know several people who turned off their governor just because of this.

[hobdean]

So is the compass 6hv about 1lb less weight than the trex 600EFL pro?