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Old 06-28-2011, 09:45 PM   #1
earthsciteach
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Default Very short flight times with new plane

I think this question may be better posted in another spot, but not sure which one is best, so Beginner is my fall back. In other words-HELP-I don't know what the heck is going on!

I flew my brand new 800 mm Airfield Spitfire (from Nitroplanes) yesterday for the first time. The flight times I am getting out of it are around 1 minute on a fully charged battery (charged verified with multimeter). That's just enough time for me to get comfortable with it in the air, then the esc just throttles down slowly till it is a glider. Not good because those elliptical wings just LOVE to stall out at the tip! No washout.

I'd be happy to provide the motor info, but apparently that is a closely guarded secret. I guess I don't have the level of clearance to be privy to that info. Its not published, even in the manual that comes with the airplane. The battery is a 7.4v, 1300 mah, 20c Blue Lipo . The battery voltage reads about 6.3v after a flight. This is about 85% of full charge.

Here's what I've done so far:

1. Verify battery has a full charge.
2. Programmed ESC to make sure the cut off is set to low (50% of full charge), battery type is set to LiPo, Set switching frequency to 16 kHz, Governor Mode is off.

The plane is fun to fly, but I'd sure like to have about 9 more minutes per flight! Any ideas/thoughts/advice?

Thanks!

All of my landings are three point landings if you count the spinner, too
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Old 06-28-2011, 11:16 PM   #2
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The battery is a 7.4v, 1300 mah, 20c Blue Lipo . The battery voltage reads about 6.3v after a flight. This is about 85% of full charge.
OK first things first,
The lipo you speak of that is a 7.4 1300 20c. 7.4 volts is the nominal voltage and when fully charged should be 8.4 volts. You may not be charging the lipo fully thus having short flight times. 6.3 volts after a flight IMHO is way too low for a 2 cell lipo, I prefer my ending voltages per cell to be around 3.75-3.85 volts at rest.

Your lipo may be damaged because you let the voltage get too low so be careful with that lipo. If you have an extra lipo make sure you charge it fully (8.4v) before you fly.

Hope this helps.

Aloha,
Les

Les
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Old 06-28-2011, 11:27 PM   #3
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Are you sure you dont need a 11.1 volt pack,what is the motor size and esc ? Some esc,s have a built in limiter that will slow the motor if you are running to big of a prop ,drawing to many amps and the esc tries to save itself. Dont ask me how i know.lol joe
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Old 06-28-2011, 11:27 PM   #4
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I just got off chat with customer service and they are sending a new battery. And I was also able to get the motor specs.

According to documentation, the esc should cut out the motor before the LiPo discharges too far. Since the longest flight that I've had with it (flew it for the first time yesterday) was about 1 minute, I do suspect that the battery was bad to begin with. In the meantime, I can throw an 11.1, 3 cell in and see how it does.

I have the 2 cell on the charger now. I'll check individual cells when the charger indicates it is full.
Thanks for the input!

All of my landings are three point landings if you count the spinner, too
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Old 06-28-2011, 11:30 PM   #5
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Hey, Joe. Just saw your post after I hit reply. Yes, I can put an 11.1 in the plane. For some reason, the motor info is not published (other than "brushless outrunner"). But I was able to get the specs from customer support.

How is your seaplane coming along?

All of my landings are three point landings if you count the spinner, too
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Old 06-28-2011, 11:35 PM   #6
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My plane is doing well ,the scale little do dads are going to have to wait till winter cause iam going to fly her and a bunch of others this summer. I would go with the bigger pack . joe


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Old 06-28-2011, 11:38 PM   #7
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Niiice! Are those curtains in the windows? I'd consider that a "scale doo dad!" Ha ha. Please post a video of that airplane in action. It looks fantastic!

All of my landings are three point landings if you count the spinner, too
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Old 06-28-2011, 11:49 PM   #8
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sorry double post. lol
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Old 06-28-2011, 11:57 PM   #9
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I am making 8 cowl scoops and exaust for the cowls next. I want to do panel lines on the hole bird this winter. I went to indiana last saterday and had motor problems of my own but i got them running great now.I also want to do a HOW TO BUILD of my cowl scoops for any one to learn and then i might start my next seaplane about 100 inch albytross,only two motors this time . Iam cutting back.lmao OH the curtains in the windows are graffics from callies graffics ,look real dont they,callie is the best around for making my peel and stick stuff and real cheap. joe
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Old 06-29-2011, 12:15 AM   #10
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Yes, it looks great. I've always thought the Grumman Goose was a great looking airplane. Hmmm..... I was thinking of tackling a scratch-built B-25, but maybe the Goose? Oh, and there's that 100 mph thing, too. Dang. So much I want to do!

All of my landings are three point landings if you count the spinner, too
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Old 06-29-2011, 12:23 AM   #11
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Every time some one says b-25 my shop tools and glue starts calling me . I have a friend here in IL that makes a short kit for a b-25 but i have so many kits and plans i want to build first. When you start building your b-25 feel free to pick my brain any time you want. Happy building. joe
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Old 06-29-2011, 12:23 AM   #12
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So, here's some more info:
ESC: 20 A
Motor:
No.of cells:2-3LI-PO
RPM/V(KV): 1300
Max.efficiency:82%
Max.efficiency current:7-12A
No load current:7.4V/0.6A
Current capacity:15A/20S

Internal Resistance:0.092 OHM
Dimensions(diameter.X length):F30.0X32.2 mm
Shaft diameter:M3.0mm
Weight :52g



Oh, get this-the prop is an 8.5x9. Seems like a weird size to me!

All of my landings are three point landings if you count the spinner, too
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Old 06-29-2011, 12:33 AM   #13
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Try reading this ,it might help.http://www.headsuprc.com/servlet/the...lectric/Detail
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Old 06-29-2011, 12:34 AM   #14
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Joe, That is a Pan Am Clipper, right? Just checking. There weren't many BIG flying boats that I am aware of. You and Neons are resurrecting some rare birds!

All of my landings are three point landings if you count the spinner, too
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Old 06-29-2011, 12:40 AM   #15
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Originally Posted by earthsciteach View Post
Joe, That is a Pan Am Clipper, right? Just checking. There weren't many BIG flying boats that I am aware of. You and Neons are resurrecting some rare birds!
Mine is a short solent that flew around 1940,s from newzealend to austrailea ,it was a 38 passenger sea plane and teal was the company . Mine is suposed to have big round spinners to show it had the upgraded bigger motors but i dont like the way the looked so i have small scale hubs coming. I know you teach but now i will teach you.lol here is one of my best sea plane sights to study up on old seaplanes.http://www.seawings.co.uk/ enjoy. joe
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Old 06-29-2011, 12:44 AM   #16
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My dog just ate the canopy of my Spitfire. Ugh.

All of my landings are three point landings if you count the spinner, too
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Old 06-29-2011, 01:12 AM   #17
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Here is my ankle biter ,she shreaded santa to pieces after the picture and she steals my balsa sticks if she gets in my shop. lol joe


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Old 06-29-2011, 01:32 AM   #18
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She looks so innocent in the picture! Here are my two monsters. The yellow lab is the guilty party in the canopy caper. The firewood on the hill is "his." He steals the wood anytime we have a fire in the fire pit in the backyard.


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All of my landings are three point landings if you count the spinner, too
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Old 06-29-2011, 01:59 AM   #19
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I have a full size dob also but she is 16 years old and not doing very well latley . We take good care of all of our dogs and they have lived for a very long time but we lost a min pin last year and the dob shadow has got cancer now. I like all dogs and they like me too. joe
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Old 06-29-2011, 01:59 AM   #20
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Originally Posted by earthsciteach View Post
She looks so innocent in the picture! Here are my two monsters. The yellow lab is the guilty party in the canopy caper. The firewood on the hill is "his." He steals the wood anytime we have a fire in the fire pit in the backyard.
ROFL oh Im going to have a heart attack of laugher because my yellow lab eats everything so far planes are not in her appetite but who knows

Happy flying may your crashes be limited and if they are not limited let them be cool.
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Old 06-29-2011, 02:25 AM   #21
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Ha ha. About 1/2 hour after destroying the canopy of my brand new Spitfire, he somehow got a stuffed animal filled with what I can only describe as micro beads. They stick to everything because of static electricity-even the vacuum cleaner! Stellar night for Cooper!

Usually he's not that destructive, but he must be bored today. We can't find his frisbee, which he is very OCD about. I was ticked off about the canopy, but not at him. It must have fallen on the floor.

Joe-sorry about your dobie. We lost a lab a few years ago and its really tough.

Right now Cooper is laying with his head on my wife's lap. These two dogs are awesome.

All of my landings are three point landings if you count the spinner, too
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Old 06-29-2011, 02:29 AM   #22
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Originally Posted by earthsciteach View Post
Ha ha. About 1/2 hour after destroying the canopy of my brand new Spitfire, he somehow got a stuffed animal filled with what I can only describe as micro beads. They stick to everything because of static electricity-even the vacuum cleaner! Stellar night for Cooper!

Usually he's not that destructive, but he must be bored today. We can't find his frisbee, which he is very OCD about. I was ticked off about the canopy, but not at him. It must have fallen on the floor.

Joe-sorry about your dobie. We lost a lab a few years ago and its really tough.

Right now Cooper is laying with his head on my wife's lap. These two dogs are awesome.
We check to see if the santas have beeds in them or tinker will have them all over the house.lmao joe
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Old 06-29-2011, 02:43 AM   #23
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Originally Posted by earthsciteach View Post
Usually he's not that destructive, but he must be bored today. We can't find his frisbee, which he is very OCD about.. .

Dont all labs have OCD, my Chesapeake chews and retrieves everything....lol......small trees......lawn furniture.....lawnmower seats and tires....mufflers.....beer cans......her fav is a duck launcher decoy.....its like her purse.....goes everywhere!!! When its cool of an evening I run her with the 4wheeler maybe 1/2mile and she goes straight to the nearest pond or tha pool!! and she still acts like she has a complex!!

have a good one
cr
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Old 06-29-2011, 02:54 AM   #24
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Crimzon-they are definitely bizarre creatures! A few minutes ago, Barley, our black lab spontaneously freaked out causing my wife to laugh and spit her mouthful of wine all over me and herself.

I think I could have a tv show on Animal Planet based on these two furry freaks.
Ha ha-this has turned into a dog thread.

All of my landings are three point landings if you count the spinner, too
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Old 06-29-2011, 06:29 AM   #25
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Laci my yellow lab hed the door bell as a puppy we thought it was funny to watch her go goofy when the door bell rang and I think we created a love hate relationship with our front door. If laci her way she would eat the door and that darn door bell. Not to mention she gets so excited by one of ou neghbor kids that she will pee. Thank goodness for carpet cleaners. Oh not to mention she ate my mothers Eater Lilly roots and all. The poops for weeks Oh and she also last night ate my DVD Rom from Testors good thing I hated that software.

Happy flying may your crashes be limited and if they are not limited let them be cool.
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