NX4 Stretch and ys50 build

[mmracecars]

what do you think of 2500hs and 520's,enough hs?

[godjc]

I thought about it but I'm afraid the X5 tube causes a rear center of gravity.

I will choose the length of the blades depending on the center of gravity with the new engine.

Jc

[mmracecars]

the cg is a bit tail heavy with the x5 boom,i just made a couple test flights on just 15% nitro(its all I have at the moment)seems to fly pretty good and a decent amount of power ,even with the 520 blades.prob add a little lead shot and epoxy in the nose of the canopy to help out.seemed to have decent power on 15%,gonna run a few more tanks of 15 then put some 30 in it and turn the gov on at 2500.

[squeely531]

Can you compare the RTF weight with your 550?

[mmracecars]

Originally Posted by squeely531

Can you compare the RTF weight with your 550?

550,w550 blades/5000mah battery =6.9 lbs
nx4,ys50/520blades/1450 life bat/fuel=5.3 lbs

[squeely531]

This sounds better every day. That's a big difference in weight. Did you fly today? What do you think?

[mmracecars]

just played around a bit with 15% nitro,seems pretty decent power,ill pick up some 30%on mon and finish breaking in the motor.
my impressions so far with the few flights ive done,i think its gonna be a blast.did a few autos from 10 ft and it just floats.

[hawkeye690]

Very cool mike!! good job on the mods and very nice flight too!!!
sure I will see it in person!

[HeliDoc25]

Are you using a gov? I wonder how it would be with more headspeed and more aggressive gov. Could you do some more aggressive load ups on the motor? Like some full or heavy pitch loops, id like to hear how it carries itself through.

[mmracecars]

Originally Posted by HeliDoc25

Are you using a gov? I wonder how it would be with more headspeed and more aggressive gov. Could you do some more aggressive load ups on the motor? Like some full or heavy pitch loops, id like to hear how it carries itself through.

Heli doc , that video isn't mine, I'm currently breaking in the motor and should have a video soon .
I'm def running a bit more head than the one in the vid.

[godjc]

I,

mine : http://www.france-helico.com/topic/2...e-50/?p=271847

[mmracecars]

heres a quick flight and light crash,gov on at 2500 hs,motor still needs some tuning.

https://www.youtube.com/watch?v=LY8d...ature=youtu.be

[kane601]

Originally Posted by mmracecars

heres a quick flight and light crash,gov on at 2500 hs,motor still needs some tuning.

quick maiden flight and light crash - YouTube

Looks good mike, sucks about the crash though. You got to get that first crash out of the way at some point,lol.. Just like my 6hvu 6 or 7 flights in and havnt crashed since. Knock on wood.

[HelisRock]

Originally Posted by mmracecars

squeely ,its a bit tail heavy as far as CG goes with a 1450 life up front,not sure if anything bigger will fit.should have it going soon,ill let ya know how it works out,doing the clutch hub for ya ,no prob.

mmracecars, this is looking excellent, gr8 job!

A Hyperion Life 2100 fits no problem (I run mine vertically up front sitting on the ledge), but not sure the little extra weight will help much balancing out that long tail!

I'd pay you for a clutch mod as well, you may need to go into business!

[mmracecars]

Originally Posted by HelisRock

mmracecars, this is looking excellent, gr8 job!

A Hyperion Life 2100 fits no problem (I run mine vertically up front sitting on the ledge), but not sure the little extra weight will help much balancing out that long tail!

I'd pay you for a clutch mod as well, you may need to go into business!

Thanks, the clutch hub mod is pretty easy , just send me one , no charge for a fellow freak

[HelisRock]

Saw your OS37 up for sale, guess there's no going back!

I'll order up a spare clutch and PM you later for your address. That's so awesome of you to do, THANKS!

[mmracecars]

no prob.prob gonna keep the 37 for a spare.

also I just noticed that that flight was on coolpower ys120 15%,im sure itll get better on 30%.

[S.Millar]

What kind of flight time do you think you will get on the stock tank?

I wonder if you could use the other gearing kits to get around 2700-2900rpm with the stock boom and blades. http://www.anythingheli.com/gaui-nx4...odized-313109/

[godjc]

I,

With mine, il fly five minute.

I'll mount 20 T upgrade this week.

Jc

[mmracecars]

At 5 min header tank is full and somewhere between 1/8 and 1/4 left in the tank.that was on ys120 15% cool power , I' put the stock blades / boom back on for some comparison , then I'll try the 30%. I think the 19t pinion I'll try next , that should put it up around 2700