David Leitch

Out of interest we measured about 80 amps this morning on new flight power EVO 3700s which suggests about 2200 watts of power. Probably means you could get away with 7S system and save a few ounces. With a lighter motor wouldn't even surprise me if you could do it on 6S and save dollars and weight. Having said that I am busting to fly again as soon as the weather co operates

Rezagh

My Feedback: (73)

Dave,

Thank you for the info. Would you please post some pictures of your engine install, ESC and battery placement for those who might be interested to do it your way. Also are these the 25c batteries you were testing?

Thanks a lot,
Reza

Rezagh

My Feedback: (73)

I forgot to ask you to post a picture ogf where you removed the covering for battery cooling as well. Whenever you get a chance ofcourse

David Leitch

Rezagh

Assuming the mods let me do it the following link has various photos

http://www.rcgroups.com/forums/showthread.php?t=783489

The photos dont really show the motor/esc placement that well mainly because I ran out of time to take them when the install was happening. For the Hacker C50 there is a standard motor mount available from www.espritmodel.com amongst others that bolts to the firewall. Not much work really. The ESC is velcroed to the underneath of the fuselage motor box and the wires poke through.

So far I haven't cut any cooling slots in the cowl and the motor felt fairly cool after the first brief flights. It will need monitoring.

Brenner

Congratulations on your success,

It looks like you're getting about 10% more power than predicted with the FlightPower 20C batteries. I assume it's because you're using 25C batteries instead, and the lower internal resistance is giving you higher voltage.

fish4100

HELLO TO ALL
I JUST WANTED TO TELL EVERY ONE ABOUT MY 69 YAK I BUILT MY PLANE JUST LIKE REZAGH EXCEPT MUFLER WAS A PITTS STYLE THIS COMBO IS THE BEST COMBO I HAVE EVER PUT TOGHTER THIS PLANE IS BAD TO THE BONE IF YOU CNT DECIDE ON THE OS120 OR THE SAITO 125 I HAVE BOTH AND BOTH ARE GOOD BUT THE OS 120 REALLY GIVES ME UNLITIMED VIRTICAL THE POWER IN COMBO IS UNBELIVABLE IT WILL CLIMB OUT OF SIGHT AND THE MOTOR IS NOT BROKE IN YET SO FOR EANYONE THAT CANT DECIDE GO WITH REZAGHS COMBO GO BIG OR GO HOME!!!!!!!!!!!!!!!!!!!!!!!!!!!

pinguecola

[:@] AAArghhhh !!!!!!!!!!!!!!!! [:@] i have saito125 and o.s.120 and i have got for saito !!!!!!!! my plane will be fliyng next week , i hope. i have broken my mind about this choice and now i have saito installed and i guess o.s. is better. and saito was fine for a scale i have to build too !!!!!!!!! sob.... sob......... i never get the right choice ! i must return to build old ships ( static ).
HAPPY NEW YEAR !!!!!!
FRANCESCO

overbored77

My Feedback: (11)

I have got the airframe assembled on the 69". I ordered the OS 120 AX and bisson Muffler,
I also ordered 4 HItec 5625MG servos with a 6volt output of 131oz. and a 2000 mah 6volt
NIMH RX pack. Will the servos and battery be ok for this plane?

I had 6 5645mg servos around but they were used in offroad cars so i said new plane and
new engine I might as well buy some new servos also. and the 25's were a bit faster.

I also have to say great job on the instructions REZ. It was a joy to assemble, and the plane
is very well built. I also have one of the bent landing gears but I did some modifying to get the
camber correct and left the wheelpants off until I get a straighter gear.

Thanks
Chris

pinguecola

now i am ready to fly.
saito 125- JR 8411 all around- JR 10x- JR extra 2700 nimh- apc 17-6- everything fit ok but landing gear. very nice to assemble, and very well enginereed. i would like to thank quique, because i think he have got a great and accurate job on this arf !!! THANK YOU QUIQUE !!!!!!
i will post some photo.
ciao francesco

pinguecola

some photo

pinguecola

other....

Edge5foamy

What wing bags would work best with the plane?

asmatt2

What is everyone using to seal the open box box behind the firewall?

guisyl

A saito 180 come's in at around 34 oz w/muffler, would this engine be to heavy for this airframe ? I think the os 120 ax weights about 29.? , as anyone put in the saito 180 in this yak ?

onewasp

You obviously have never flown a Saito 180powered plane.
The Saito 150 is way too much for this A/C; the 180 on an airframe this light is "aerobatic suicide"

The 180 is a full load for the 73".

guisyl

no only have flown .40 & .60 size plane but planning on ordering this plane in the next couple of weeks and just trying to get more info to make sure a buy the right engine for this a/c. Thanks for your input

onewasp

I have not flown the A/C but from what I've red everyone seems happy with one of the following:
OS120AC; YS 110FZS; Saito 125.

These engines are within the correct weight and power range. At 8.5# it's more than enough for vertical and overall performance the A/C is intended for.
A little further back in this thread Rezagh compares the performance of the first two and comments on the third.

Edit addition: go to post 159.

guisyl

After reading all of this forum I decided to go with the O.S. 120 AX and i already have a saito 125 so i will be able to try it with both engines. Thank you.

rafale_pj

Hi !!!
I've been following this forum since the beginning even though, I didn't have any Quique model aircraft yet. Now, I've just received mine and I'm so enthousiast about it. I got the OS120ax brain new engine and will put two futaba s9351 and two hitec 5645MG into it +1 for the engine(don't now yet). I was glad to see than the new aileron hardware set was include in the package. I can't wait to start building it but with the weather we have here in Finland, I can wait the spring to start flying it on our field. The runway we have on the ice is pretty short and snow and ice around it pretty hard if I have to do a quick landing.
I also have two question for you guys....:
On my s9351 servo box, it says Ni-Cd use only. Does that means I can't use Ni-Mh at all ? Why ?

I knew about the problem of the landing gear before I bought the plane hoping that the error would have been corrected by now but it seems That i got the wrong one. Who do I have to contact to get this problem fixed ?

Thanks a lot to all of you for your comments who help me decide buying this plane and thanks a lot to the builder of the plane.
Regards,
Rafale-pj

pinguecola

my yak flies like a dream. you have an F3A plane and if you want to go crazy, simply switch and.... i never , repeat never, had an airplane so amusing !!! it 3des so happily!!!! and you never feel anything wrong !!! thank you quique this is really a great plane. []unique issue the landing gear: too narrow and wheels are not perpendicular to the floor. anyway it land so slow you barely need wheels !!
ciao quique e grazie !!!!
francesco

3D_Junkie

Can someone measure the cowl diameter (at the fuse) and the length?

Rezagh

My Feedback: (73)

Guys,

Here's a new video of 69" on YS 1.10.

http://www.rcmodelaviator.com/Videos/Yak69_YS110.wmv

If you go to my website www.RCModelAviator.com you can watch the OS 1.20 and YS 1.10 performance!

Thank you,

Reza

octanehuffer

I am in the process of ordering parts for this plane and already have two HS5645 Torque servos. Speed is .18@6v.
I am wondering about getting two HS 5625 Speed servos for ailerons. Speed is .14@6v.
I have never put different servos on a plane before, so is there any purpose to it? I would think that the torque servos should be for the rudder and elevator because they get more torque load, but speed is also a necessity.
Am I over thinking this?

Edge5foamy

It is about 7-3/4'' wide(at the fuse), and 9'' long.

pinguecola

Reza i have seen your video with YS 110, and it is simply stunning !
you are a great pilot, indeed, but i have a saito 125, coolpower, apc 16-6 and my engine is by far weaker than your !!! i think you have 1500 2000 rpm more !!!! what a ballistic engine !!! i can pull out from an hovering, but slow, slow, and your plane is fast !!!! so fast !!!! i have only 12 flights on mine, but i do not thing it will improve now.
because ys is heavier than saito, have you had trouble about cg ? have you had to move back the battery pack ?
thank you francesco