RE: Precision Aerobatics Katana MD Build and Fly  
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RE: Precision Aerobatics Katana MD Build and Fly - 11/24/2007 3:25:15 AM   
Valve floater


 

Posts: 120
Joined: 8/2/2007
From: Port Allen, LA, USA
Status: offline 		I use TP Extreme Batteries 3 cell 2200. I have my time set at 7 min. I am using an E-flight 40 amp esc. It is not great on auto shutoff. Using the thrust motor with the APC 12-6 prop. I have went down with other planes with this setup: and once with the MD but no damage. I like to play it safe because it gives me hardly any warning at rundown. I have 3 batteries and i don`t want to ruin them, they are to costly to replace. I usually have enough power after the alarm beep for two go arounds before landing and decent taxi and still enough for a minute run. Run those lipo`s down to much and you will be buying more to soon. Don`t risk it. Set your timer low first, to get a feel for your runtime. I have never had a lipo burst. I have bought some cheap one`s and found out they were junk.Spend the extra money.

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_____________________________

Full throttle at Full deflection, or stay home!

(in reply to LeeHunt)
       Post #: 301

RE: Precision Aerobatics Katana MD Build and Fly - 11/25/2007 3:16:01 PM   
jaihunt


 

Posts: 12
Joined: 12/31/2006
From: katherineNT, AUSTRALIA
Status: offline 		back again, this is LeeHunt, using my sons log in
Well flew the Katana this arvo, wow is all I can say. Had it a long way out of trim??????. I must be doing some thing wrong with the batterys they only lasted a short time and ran down without warning. all i did was charge them up 2days ago and fly them today, I think I have this wrong. Now Iam told I should discharge them and charge them first??????, comments welcome, as I said this is the first electric I have used!!!!. There are 3 wires from the motor and 3 from the ESC does it matter which wire goes where??.
I got 2 props with th ekt and I used the smaller 12x 6, will the battery flatten quicker with the 13x6 and is it better maybe.
I had 2 flights the first the trim was a long way out so trimmed it up and off I went, 2nd flight same thing the trim was all out of whack. Is this just the battery position.
My ailerons hinges were not glued and ai still have some small play in them is this normal or should I complain.

Jeez what is this??? 100 questions??
Not withstanding the above I think I will get to really like this model once I iron a few bugs out.
Thanks again for all your comments
Oh by the way still got all me fingers

(in reply to Valve floater)
       Post #: 302

RE: Precision Aerobatics Katana MD Build and Fly - 11/25/2007 5:42:23 PM   
Valve floater


 

Posts: 120
Joined: 8/2/2007
From: Port Allen, LA, USA
Status: offline 		Your ailerons not glued in!!? Dude, follow every instruction in the setup book to the word. Do not miss any steps. If you follow the instructions to the book, you should not have any issues.Go through it again. We can`t help you if we don`t have a clue if you missed any steps at assembly. I always charge up my batteries before my flights just in case. Do you have any drag on the motor when you spin the prop by hand without the battery of course. Fly about 4 min. on your first flights. These are not NI-cad or Nickel metal.You do not dischage them or cycle them. This has been mentioned in earlier threads. Read up on the insert that came with the battery,and study up on it. Are you using a lipo type charger. If not you may burn your house down. Sorry to be so direct to the point, but we don`t want you to get hurt by the plane or the battery. Send us some pictures of the plane and what you have done so far. Of the inside and outside. Also with the cowling off. I can see what you may not have right.

_____________________________

Full throttle at Full deflection, or stay home!

(in reply to jaihunt)
       Post #: 303

RE: Precision Aerobatics Katana MD Build and Fly - 11/25/2007 7:21:44 PM   
aflipz


 

Posts: 934
Joined: 7/2/2005
From: Montreal, QC, CANADA
Status: offline 		How can the ailerons not be glued in? they are assembled at the factory with the most beautiful hinge system i have ever seen! Are you sure you aren't talking about the old Katana?

Not sure what you mean by out of trim; if youre talking about pitch maybe your cg is off. As for your flight times i don't know what's going on; do you fly full throttle all the time? This thing needs like 30% throttle to maintain level flight, can do an entire sequence at 50-60% for speed/stability and hovers at 50% or less throttle! 100% is only necessary to climb a fast vertical.

the 3 motor leads have no importance other than if it spins the wrong way you simply reverse 2 of the 3 wires.

(in reply to Valve floater)
       Post #: 304

RE: Precision Aerobatics Katana MD Build and Fly - 11/25/2007 7:26:14 PM   
aflipz


 

Posts: 934
Joined: 7/2/2005
From: Montreal, QC, CANADA
Status: offline 		It just occured to me;

did you remove the circlip from around the motor shaft prior to mounting it? (as per the warning ) This could explain unexpectedly short flight as it will cause massive resistance to rotation thus increasing the load considerably because it would be pressed against the firewall and "grab" the shaft.


I know he is using a lipo charger but i don't know how it operates or if it is set right. One thing is for certain, if it's the circlip thing this might have caused much higher loads than the pack is rated for in worst case scenarios. Let's not get ahead of ourselves though. Tell us what you find. Was the pack very warm when i came down?

(in reply to aflipz)
       Post #: 305

RE: Precision Aerobatics Katana MD Build and Fly - 11/25/2007 7:31:11 PM   
Valve floater


 

Posts: 120
Joined: 8/2/2007
From: Port Allen, LA, USA
Status: offline 		Wow, Aflipz, could you imagine the heat around that motor shaft would cause? I hope he can send pic`s. I left my clip on, but i hollowed out the hole on the mount a little so it would not hit. That`s before i found out to take it off!

_____________________________

Full throttle at Full deflection, or stay home!

(in reply to aflipz)
       Post #: 306

RE: Precision Aerobatics Katana MD Build and Fly - 11/25/2007 7:34:35 PM   
aflipz


 

Posts: 934
Joined: 7/2/2005
From: Montreal, QC, CANADA
Status: offline
quote:

ORIGINAL: Valve floater

Wow, Aflipz, could you imagine the heat around that motor shaft would cause? I hope he can send pic`s. I left my clip on, but i hollowed out the hole on the mount a little so it would not hit. That`s before i found out to take it off!



Kinda like a spun bearing... I'm less worried about that than the load on the pack though. That also might be what caused the premature cutouts; not actual LVC but overcurrent/temp protection of the esc.

(in reply to Valve floater)
       Post #: 307

RE: Precision Aerobatics Katana MD Build and Fly - 11/25/2007 10:18:27 PM   
LeeHunt


 

Posts: 185
Joined: 2/2/2006
From: Katherine, AUSTRALIA
Status: offline 		Hi, followed every step in the book, took the circlip off, but no, the right aileron had 2 hinges not glued, quality assurance? was able to get some thin CA in with an applicator, but there is still a small amount of movement at one end, however I cant see that the hinge is loose. will fly this again tonight after work and see if the batterys improved from there last charge, this will mean that they have sat around for about18 hours since being charged. After they were charged they had 12.5volts each I think.
I will let you know what happens after tonight.
I have only been flying for 2 years but we get in about 20- 25 flights a week every week, so Iam quite confident of my ability to build a model ( i have built heaps ).
Could the tempreture here have a bearing on the batteries at the moment the days are 40C ish just getting into our wet season.
I will try some photos but dont hold your breath, tech and me dont really go together
Again thanks for the comments and advise

(in reply to aflipz)
       Post #: 308

RE: Precision Aerobatics Katana MD Build and Fly - 11/26/2007 10:21:31 PM   
LeeHunt


 

Posts: 185
Joined: 2/2/2006
From: Katherine, AUSTRALIA
Status: offline 		WEll flew it last nite and all I can say is CofG, Had it to far forward, moved the battery back and presto flys really really great. The batteries last about 7 mins, can you get bigger and if what would you suggest. I will have to buy more batteries so I can fly more than twice between rechargers. I have the PA supplied lipos at the moment.
Hey how do you chaps line the battery up each time for the exact Cof G, any niffty hints???
Forgot the camera will take it tonight
Hey starting to love my KATANA, KE loops, far out never thought I could do them!!!!!
Going to try the 13x6.5 prop tonight any comments on battery life??

Lee

(in reply to LeeHunt)
       Post #: 309

RE: Precision Aerobatics Katana MD Build and Fly - 11/27/2007 1:09:34 AM   
aflipz


 

Posts: 934
Joined: 7/2/2005
From: Montreal, QC, CANADA
Status: offline 		WOW!

You must be extremely throttle happy especially if 7 minutes brings you to the cutoff! What are you doing up there? Full throttle pattern sequences all the time? If you maintain the same throttle behaviour your flight will only shorten with a 13x6.5. If flying at that speed is all you want to do you won't mind whatever weight the extra capacity batteries you could possibly fit in there but you'll be missing the whole point of this lightweight marvel of 3D flying technology. Ease up, stall a little

Shaun once got 18 minutes out of your setup. I get a good 10, cut it to 8-9 if it's real windy and i have to waste power to track straight.

(in reply to LeeHunt)
       Post #: 310

RE: Precision Aerobatics Katana MD Build and Fly - 11/27/2007 2:18:04 AM   
LeeHunt


 

Posts: 185
Joined: 2/2/2006
From: Katherine, AUSTRALIA
Status: offline 		Ta, point taken, I was spending that long trying to get it to fly right till I worked on the CG. 7 min was not cut out time and I could have gone on longer, I was being careful??!!
Are the batterys supplied by PA good and should I buy more of these or are their other types that are better

(in reply to aflipz)
       Post #: 311

RE: Precision Aerobatics Katana MD Build and Fly - 11/27/2007 2:58:12 AM   
aflipz


 

Posts: 934
Joined: 7/2/2005
From: Montreal, QC, CANADA
Status: offline 		So far it has not made economical sense for me to have PA packs shipped 1/2 way across the globe, but from what i hear they are fine packs indeed.

Oh, i was under the impression that squeezing every last bit out of the pack meant only 7 minutes takeoff to landing. What was your resting voltage at when you landed vs 30 minutes later?

(in reply to LeeHunt)
       Post #: 312

RE: Precision Aerobatics Katana MD Build and Fly - 11/27/2007 3:53:37 AM   
Valve floater


 

Posts: 120
Joined: 8/2/2007
From: Port Allen, LA, USA
Status: offline 		Sounds like your on the right track.

_____________________________

Full throttle at Full deflection, or stay home!

(in reply to aflipz)
       Post #: 313

RE: Precision Aerobatics Katana MD Build and Fly - 11/27/2007 3:58:46 AM   
aflipz


 

Posts: 934
Joined: 7/2/2005
From: Montreal, QC, CANADA
Status: offline 		Yeah! It sure does.

(in reply to Valve floater)
       Post #: 314

RE: Precision Aerobatics Katana MD Build and Fly - 11/27/2007 4:50:08 AM   
LeeHunt


 

Posts: 185
Joined: 2/2/2006
From: Katherine, AUSTRALIA
Status: offline 		Ta again,will collect a bit of data tonight and post this, ill try to get photos too

(in reply to aflipz)