components for endurance flight

[Fatroll]

First off... lets assume 'Gestalt theory' here:

look at it as theoretical at least; money and availability are not in question (compatability is a must however), what overall components/configuration establish a Trex700e as an endurance flyer, (dismissing aggressive 3d flight)?
In other words, 1) what overall configuration will permit a 700e the greatest amount of time airborne? 2) what is the greatest amount of time your configuration can remain airborne (without aggressive/3d flight?)

I understand the question involves a massive amount of variables, so just assume optimum weather at sea level, no wind, moderate temperature, etc

Thanks guys!

[danyl]

I am not certain there is much wiggle room other than battery size and headspeed.

You can't shave much weight off the 700.

Use 5000 mah lipos, and keep headspeed around 1800 rpm. Hover and slow forward flight.

The 80 amp ESC will suffice with 8hz pw, and low gains

That's about it.

Expect 10 - 12 minutes flying time (hover time)

Or, 5000 mah lipos, 2100 hs, 12 hz pw, 120 amp ESC and loops, flips, rolls, tic-tocs, funnels, for a five minute joy-ride and then land and change your batteries.

[f22warzone]

27 min flight
https://www.helifreak.com/showthread...ax+flight+time

I am not that extream but on my set up at 1700 rpm and easy slow sport flying i get 10 min

[helicraze]

Some TDR dudes did 30 min flight 5800MAH packs, 1000RPM, soft 3d

[Fatroll]

Well, I guess, considering the major components then.. what brands and or models of the key pieces such as the motor, esp, battery, etc are better designed for effeciancy... I'd hate to have to do the math myself on this lol...
Is there some calculator out there on any of the retail sites where you can make 'configuration moc-ups' with estimated numbers? That would be very coolbeans.

[tjbooksandmore]

I am seeking the same times.
Thanks.

[helicraze]

Just use low RPM and a low KV motor that is efficient like the pyro 450KV and gear accordingly

[Jeff396]

Castle Creations has a heli flight calculator on their site. I spend a lot of time there playing with different componants to see the affect on my heli and camera rig combo. It's loads of fun I have a Trex700 converted to 800 with MAH 810's still running the stock motor with a 10t pinion and 1275 head speed. I run 5000mah Turnigy lipo's 12s 1p and have gotten an 18 minute flight running the batteries down to 3.2 volts. I will eventually go lower on the head speed. For that I will also need to swap out the motor with a 400 kv size I believe. That time wasn't with my 8 lbs camera rig attached so I am planning on trying 12s 2p for flight time when I'm hauling that. I fly the 800 doing mild aerobatics but the 18 minute flight was just flying around.

Jeff

[Fatroll]

That's excellent info, and absolutely part of what I was looking for. I will check out the information on Castle, and see if that will break a little ground into (at least) some of the points from an electrical standpoint.
The other side of the equation being the air foil…headspeed x expo x area of blade (etc,etc,etc)…which combination generates the most efficient positive pressure (not necessarily foil). If anyone has any insight into this…even if you do not know the exact numbers, please contribute.

As a secondary to the above…Is there any place where custom blades can be made? I would be horribly interested to see if there have been any rotor blades that have been created with ‘winglets’ on them (like on the tip if a 747 for example), micro veins at certain distances from the center, or even blades that are different in girth from grip to tip…hmm.

[weedwacker]

Gotta ask. Why the interest in rotor winglets?

[terrabit]

Winglets save somewhere around 3% in fuel consumption on 737's.