CMPro PT-19

[bicyclemonkey]

I just picked up this PT-19 from nitroplanes.

http://www.nitroplanes.com/cmp076-fa...-pt19-kit.html

I couldn't find a manual online so I'm looking for hobbyking motor suggestions. I'm looking at either

TR 35-42D 1000kv Brushless Outrunner eq: AXi 2820
or
TR 35-48-A 1100kv Brushless Outrunner Eq: AXi 2826

Any others that might work better?

The PT-19 states it has a 63" ws.

[hfb]

I got one delivered Friday 13/08/2010. It looks great. Wings and tail parts are mounted and waiting for power and electronic parts. This should help the manual problem.
Harold

[bicyclemonkey]

Thanks, I got mine on Friday the 6th of August. The manual really wasn't a help as far as motor and prop selection go. I was surprised to see built up wings on a plane this size. Unfortunately they were out of stock of the scale oleo struts when I ordered mine. What electronics are you going with? I ordered this stuff from HobbyKing and should be delivered tomorrow.

TGY AerodriveXp SK Series 42-40 750Kv / 600W
TURNIGY Sentry 60amp Speed Controller
HXT 6.9kg / 39.2g / .16sec Twin bearing servo

I got a watt meter so I'll try it with an APC 12x6 prop and see how it goes.

[hfb]

Motor Headsuprc 3548-09 550watt peak 11X5.5 Thin Electric prop
Battery 4cell 2200mah HobbyPartz Maybe 2 batteries after the first few flights.
ESC HobbyPartz 40 amp cont. 60 peak
BEC Headsuprc 3 Amp
T PRO MG996 servos
All of which will start coming in Tuesday. It is too hot here for me to fly. I also want more time on my Trainer, Hangar 9 Alpha 40, before I fly the PT-19. So I suspect it will be mid Sept. before I fly it. All the specs indicate it will fly like a trainer. With no servos and no power train I get 1.56 KG with less than 1 KG left to add. When you fly please let me know what you think. I want enough power to do a loop from a level start.

[bicyclemonkey]

For only 63", this thing takes up a lot of space

[bicyclemonkey]

The wings are now hinged.



It definitely needs some scale struts.

[bicyclemonkey]

It's seems, according to the manual, that only one aileron servo is used.



I went ahead and used two.

[hfb]

I have gone with one, square in the middle. A big 55G, Digital, Metal gear one. I think we both have overkill.;

[bicyclemonkey]

I thought about going with one but I would have had to shave some of that plywood that's visible b/wn the two servos.

It all fits nice and there's plenty of clearance for the servo arms and the elevator and aileron servos that mount just above them.

[bicyclemonkey]

The covering has now been cut from the horizontal stab and is ready for epoxy.



Epoxied in place.



Elevator has been hinged.

[bicyclemonkey]

Horizontal stab installed.



Rudder installed and hinged.

[bicyclemonkey]

Elevator/rudder servos mounted in the tray.



Motor mounted.



Test fit with the cowl.

[bicyclemonkey]

Test fit with wood prop



It wasn't lining up correctly so I used some 1/4" spacers, that let the cowl fit much better.



It only came with two of the triangular shaped balsa braces so I improvised with a couple popsicle sticks.



The cowl is now in place.

[dditch66]

I will be curious to hear what you guys get for the final weight w/o battery.
And some video too !

[hfb]

I got 2.05 KG with no battery and with about a 900 watt motor. I am going to fly at first with a 200 Gram Battery.
Harold
I also have 3 55 Gram servos. T-Pro Digtal metal gears MG996 .

[bicyclemonkey]

Everything but the battery on mine came out to 4lbs 8oz.

[bicyclemonkey]

[bicyclemonkey]

Ready for the maiden flight this afternoon!



I kept getting a strange noise from the motor when using my two new 4s 5000mah batteries. It worked just fine with my old 4s 4000mah battery though...what do you guys think?

Here's a vid of the weird noises:

YouTube Video

[hfb]

Strange sounds are never a good sign. I had a motor fail last month after making strange sounds.

[bicyclemonkey]

Originally Posted by hfb

Motor Headsuprc 3548-09 550watt peak 11X5.5 Thin Electric prop
Battery 4cell 2200mah HobbyPartz Maybe 2 batteries after the first few flights.
ESC HobbyPartz 40 amp cont. 60 peak
BEC Headsuprc 3 Amp
T PRO MG996 servos
All of which will start coming in Tuesday. It is too hot here for me to fly. I also want more time on my Trainer, Hangar 9 Alpha 40, before I fly the PT-19. So I suspect it will be mid Sept. before I fly it. All the specs indicate it will fly like a trainer. With no servos and no power train I get 1.56 KG with less than 1 KG left to add. When you fly please let me know what you think. I want enough power to do a loop from a level start.

Have you flown your's yet? How's the build coming along?

Mine flew great but it seems the battery died a little too soon, ~7 min approx. I'm used to getting four 5-minute flights on my Sig Seniorita on the same battery. I'm not sure if that was b/c the motor seems to be messed up or if it was just sucking down the juice fast. I may have over propped so as soon as I get the motor sorted out I'll try a 12x7.

[Capt Easy]

Originally Posted by bicyclemonkey

Ready for the maiden flight this afternoon!



I kept getting a strange noise from the motor when using my two new 4s 5000mah batteries. It worked just fine with my old 4s 4000mah battery though...what do you guys think?

Here's a vid of the weird noises:

YouTube Video

It sounds like the timing needs adjusting....

[hfb]

It is still too hot for me. I have been away from flying so long now I am going to start off with my HawkSky first the some Alpha flights before the PT-19. How did the PT-19 fly compared to the Seniorita?

[bicyclemonkey]

Originally Posted by Capt Easy

It sounds like the timing needs adjusting....

How do you adjust the timing?

Originally Posted by hfb

How did the PT-19 fly compared to the Seniorita?

The Seniorita is a basic trainer, flat bottom high wing, super stable and will *almost* land itself. The PT-19 seems to be like an advanced trainer (low semi-symmetrical wing). It flew very nice while it was in the air. I took it up high to kill the throttle and see how it would stall and it just didn't. It kept slowing down and slowing down and I kept expecting it to drop a wing or the nose and it finally was moving so slow it seemed like it was going to just stop in the air before it stalled. It's a floater.

[texasclouds]

subscribed!

[hfb]

I hoped for that kind of performance from the PT-19 but I am still new to all this. I am trying to work my way up to the novice level. In April I crashed a Seniorita on my second flight with it.