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Permalink Reply by Rhett Walker on February 6, 2011 at 9:09pm

 

I did the math, and if you ran your motor at full throttle you would only get about 5.8 minutes of flight time. So that would explain why the flight time might have seemed short.

 

It seems as though your model is slightly overpowered. I looked at the specs for the RQ-11, and if its this one it only calls for a 20 to 30 amp esc which means that a outrunner 400 to a 480 would probably do just fine. the 400 consumes about a third of the amps of your 15, which would definitely increase your flight time if used. You might consider getting a larger capacity battery, but for airfoils there is a maximum amount lift they can provide so your plane might not even be able to carry a larger capacity battery.

now that Ive talked your ear off here's my diagnosis =)

 

Your 15 may make the plane go faster, but it sacrifices power and lots of it, so i would try something smaller like a 400 or a 480. It may fly a little slower, but it would definitely have a longer flying time.

If you have extra money to throw away, i would even try a larger capacity battery and see how it handles the extra payload

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Permalink Reply by Cesare Bocconi on February 7, 2011 at 3:42am

Hi..

thanks for your help... I really think that the combo I started is very over the necessity.

I need a not so higher speed, but really a high endurance.

I will try your suggestion and let you know.

thanks

Cesrae

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Permalink Reply by Johann Van Niekerk on February 7, 2011 at 3:16am

Hi Cesare

I have a 5000mah 4S battery in my standard Raven with a 35A ESC and a 480watt motor, The battery pack is abit heavy but thats becuase I was cheap and bought a 560g batteryinstead of a lighter more expensive battery , With the extra weight I unfortunatly need to fly at 75% throttle but i get 20 min flight time ! if you were to go and look for a 5000mah 4S battery under the 450g mark you would be getting good flight times !

 

Best setup if seen sofar was a 30A ESC with 400 watt motor and 2 batteries in parellel making up 5000mah and cruizing at 60% throttle . flight time was 45 min if i remembered correctly 

 

Regards

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Permalink Reply by Cesare Bocconi on February 7, 2011 at 3:46am

Hi...

thanks a lot...

it is really impressive why manufacturers always recommend an "over" specification combo for motorization.

With your and others suggestions I think that the solution is arriving.

I will start next week the buying of more components..

thank you very very much

best regards

Cesare

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Permalink Reply by Donald Gallay on February 7, 2011 at 8:54am

I am running e-flight park 480 1020kva,  parkzone 3 blade 9x7.5 prop,  castle 56 esc, turnigy 2200mah 3s 20c batt

I had a 25 min flight at about 1/2 throttel carrying a second battery and fpv gear. not shure what auw is

MY opinion is this plane is not a very good fpv platform. no glide, very twitchey not stable and smooth, have had to reglass the bottom from landing the fiberglass is very thin just one layer, ripped the horizontal stab. off, landing in grass, now its sold sheet balsa. I do not think the plane will last many flights. my friend skidded his wing tip on landing and ripped the wing off at screws and cracked the fiberglass around them on his first flight.

DIG

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