Sapac L39 test flight and build pictures

EDDIEGIGOWATTS · Mar 03, 2009, 10:38 PM

Hi everyone I test flew one of the new L39s that I built
all I can say the performance was awesome for a stock 70mm bird
if you took a look at this plane you would think a 70mm EDF is too small
it had plenty of power ,,speeds where around around 125 mph or more
I was a little skeptical about the scale wing ,it looks kind of small
because other RC L39s out there have over size wings like pylon planes
to help with the wing loading
well I was wrong the planes wing loading was rock solid like the T45 hawk
it couldn't be any better ,,and to top it all off ,, the fans impeller was damaged with 2mm of small chunks missing from all the blades,,it happened when I ran the fan before test flight,I didn't tightened it hard enough and the impeller lodge its self in to the intake,didn't have another one,
I had a 15 to 20 mph cross wind take off was no problem
got some small vids

here is the power set up
motor Sapacs new black tornado 3200 kv out runner
=1055 watts 75 amps installed
battery Sapac new black tornado 25c 3500 4 cell Lipo
retracts Sapacs
ESC castle 80
servos HS55s ailerons and flaps and rudder + steering and valve
HS56 on elevator

Sapac L39 (1 min 13 sec)

lavochkin · Mar 03, 2009, 10:57 PM

Excellent!!! I knew it would fly well. Is the factory ch spot on or.....???????

EDDIEGIGOWATTS · Mar 03, 2009, 11:08 PM

if youre talking about the CG,, don't know what the factory calls on the CG
this was a kit that was missing lots of parts
I just got a production model from Mike
let Me compared them and I have also lots build pictures

lavochkin · Mar 03, 2009, 11:16 PM

Ok! Oops type-o there. I meant CG. But you knew that.

EDDIEGIGOWATTS · Mar 03, 2009, 11:16 PM

OK the CG on mine is 60mm from the leading edge of the wing
the plane was a little nose heavy
Lav here is the a end

Sapac L39 end of test flight (1 min 3 sec)

lavochkin · Mar 03, 2009, 11:57 PM

did you use flaps on landing or take off?

lavochkin · Mar 03, 2009, 11:59 PM

It looked good. This 70mm version is quite a bit larger than my k&a composite l-39. So I bet even with a lot of watts ie...1400-2kw it will hit a wall at some point with speed.
Yours looked good. No flutter? No problems?? Hope not. Than that is a big plus.

EDDIEGIGOWATTS · Mar 04, 2009, 08:37 AM

Lav couldn't imagine 1400 watts ,it flys with plenty power and vertical at 1075
I thought I was going to get flutter on the elevators ,because this one had a carbon
rod system to link both elevators,the new one has a metal rod 200% better
also this plane sit,s up tooo high ,I will lower it about a 1/2" and move the wheel wells
apart so the wheels drop in,,next time I,ll try the flaps

Steve C · Mar 04, 2009, 11:30 AM

Sweet.

Nice to see a plane with scale wings flying so well.

Steve C

lastresort · Mar 04, 2009, 12:49 PM

This think looks great. Do you think it would fly off of grass with the retracts or would it be better to bungee and belly land it or neither?

400driver · Mar 04, 2009, 01:05 PM

keep the videos coming! Cant wait to see more of this great plane. Flaps should make a big difference on the landing speed , i hope!

carl rich · Mar 06, 2009, 05:38 AM

Faster than I expected and that's a good thing! Looks very stable.
Got a radar gun?

lastresort · Mar 06, 2009, 07:18 PM

Eddie it was good to meet you today at FLJETS. Thanks for all the info. I'll need more and I'm looking forward to you posting the build pics we spoke about. If I don't stay home and build this thing while your still in Lakeland.

EDDIEGIGOWATTS · Mar 17, 2009, 12:24 AM

Ok here is some build pic,s of the prototype and the V1 production L39

EDDIEGIGOWATTS · Mar 17, 2009, 01:18 AM

I used a HS56 for the elevator

Mar 17, 2009, 12:24 AM	#14
EDDIEGIGOWATTS 1.21 gigawatts Join Date: Jul 2006 Location: Fort.lauderdale Florida Posts: 634	Ok here is some build pic,s of the prototype and the V1 production L39 Attached Thumbnails here you see my servo lay out, I use CA to hold them in place ,notice that one of the flaps servos are in the same direction ,I will move the flap horn over so it lines up this way I can Y them on one channel 80.7 KB · Views: 829 before you intall anyhing thin and thick CA the retracts mounts ,,here I cut the aileron plug off and solder the + and - to the flap servo ,, then solder a single signal wire this will keep the clutter down 29.8 KB · Views: 476 find the hard points and cut out the openings and install the horns with thick CA since I,m using a single channel for flaps I put a Z bend on one of the flaps so I can adjust,, the other can be subtrim on the radio ,,did the same for the ailerons 17.6 KB · Views: 557 here you can see the results of having less wires 33.8 KB · Views: 434 check retracts for loose bolts,, caution when drilling the retracts mounts ,,use a small tube spacer on the bit to control the deph,,i 26.2 KB · Views: 503 24.2 KB · Views: 409 wire mains with out the spring ,,the wheels came of a parkzone typhoon very light ,,on a production L39 ..wheels will have to be turn downed with a dremel because the openings are smaller 32.8 KB · Views: 583 I use the typhoon plastic collar 28.0 KB · Views: 527 here is the retract valve ,,on a piece of ply with velcro on the bottom,,I like it this way so i can acces it under the canopy 17.6 KB · Views: 530 wing air line coupler 35.6 KB · Views: 467

Mar 17, 2009, 01:18 AM	#15
EDDIEGIGOWATTS 1.21 gigawatts Join Date: Jul 2006 Location: Fort.lauderdale Florida Posts: 634	I used a HS56 for the elevator Attached Thumbnails here is the elevators the longer carbon rod goes in the front, assemble the elevator link pic#4,slide from the inside of the exhaust make sure the horn lines up with the servo box,, now test fit everything 84.6 KB · Views: 551 sand the carbon tubes and the mating area of the fuse glue the stabs with 15 minute epoxy make sure they are level ,,after it has cured test fit the elevators again 52.2 KB · Views: 463 take a look at the elevator from the rear make sure they are both equal if not pull the link out , twist it till they level ,once everything looks good CA the hinges and link in place 61.3 KB · Views: 534 test fit the control link ,if the tube is too long cut it with a dremel, I sanded the carbon rod and ends ,,used CA to glued them ,,also I used a sullivan clevis on the elevator horn instead of the ball link chek for play 72.3 KB · Views: 711 on the servo I used the suplied ball link ,,make sure you use all the resolution throw of the servo a bad ratio will give bad trims,, when the elevator is full up the servo should be maxed out at its end point 59.7 KB · Views: 659

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Mar 03, 2009, 10:57 PM	#2
lavochkin Soviet Aircraft nut !!! Join Date: Oct 2006 Location: Mokena,Illinois -United States Posts: 4,735	Excellent!!! I knew it would fly well. Is the factory ch spot on or.....???????

Mar 03, 2009, 11:08 PM	#3
EDDIEGIGOWATTS 1.21 gigawatts Join Date: Jul 2006 Location: Fort.lauderdale Florida Posts: 634	if youre talking about the CG,, don't know what the factory calls on the CG this was a kit that was missing lots of parts I just got a production model from Mike let Me compared them and I have also lots build pictures

Mar 03, 2009, 11:16 PM	#4
lavochkin Soviet Aircraft nut !!! Join Date: Oct 2006 Location: Mokena,Illinois -United States Posts: 4,735	Ok! Oops type-o there. I meant CG. But you knew that.

Mar 03, 2009, 11:57 PM	#6
lavochkin Soviet Aircraft nut !!! Join Date: Oct 2006 Location: Mokena,Illinois -United States Posts: 4,735	did you use flaps on landing or take off?

Mar 03, 2009, 11:59 PM	#7
lavochkin Soviet Aircraft nut !!! Join Date: Oct 2006 Location: Mokena,Illinois -United States Posts: 4,735	It looked good. This 70mm version is quite a bit larger than my k&a composite l-39. So I bet even with a lot of watts ie...1400-2kw it will hit a wall at some point with speed. Yours looked good. No flutter? No problems?? Hope not. Than that is a big plus.

Mar 04, 2009, 08:37 AM	#8
EDDIEGIGOWATTS 1.21 gigawatts Join Date: Jul 2006 Location: Fort.lauderdale Florida Posts: 634	Lav couldn't imagine 1400 watts ,it flys with plenty power and vertical at 1075 I thought I was going to get flutter on the elevators ,because this one had a carbon rod system to link both elevators,the new one has a metal rod 200% better also this plane sit,s up tooo high ,I will lower it about a 1/2" and move the wheel wells apart so the wheels drop in,,next time I,ll try the flaps

Mar 04, 2009, 11:30 AM	#9
Steve C Up and at 'em F-35 Join Date: Feb 2001 Location: Lodi CA Posts: 2,142	Sweet. Nice to see a plane with scale wings flying so well. Steve C

Mar 04, 2009, 12:49 PM	#10
lastresort Registered User Join Date: Jun 2007 Posts: 67	This think looks great. Do you think it would fly off of grass with the retracts or would it be better to bungee and belly land it or neither?

Mar 04, 2009, 01:05 PM	#11
400driver Registered User Join Date: Dec 2006 Location: Barcelona Posts: 86	keep the videos coming! Cant wait to see more of this great plane. Flaps should make a big difference on the landing speed , i hope!

Mar 06, 2009, 05:38 AM	#12
carl rich EDF Nut Join Date: Jan 2006 Location: Cincinnati Posts: 1,559	Faster than I expected and that's a good thing! Looks very stable. Got a radar gun?

Mar 06, 2009, 07:18 PM	#13
lastresort Registered User Join Date: Jun 2007 Posts: 67	Eddie it was good to meet you today at FLJETS. Thanks for all the info. I'll need more and I'm looking forward to you posting the build pics we spoke about. If I don't stay home and build this thing while your still in Lakeland.