MX450 Setup

[HeliGunner]

Hi Guys,

Was wondering if you could help me, I just finish putting together my Helimax 450 with the following electronics.

Motor : OK -500 Outrunner Brushless Motor - 3500 Kv
Key Features & Specs:
3500 Kv / 3800Kv
30A Electric Regulator
6-12V Voltage Range
3-6A Working Current

ESC: Tower Pro 30A
Key Features & Specs:
Current max: 33Amp
FET: 15
BEC Current: 1.5A
Timing: Auto
PWM: 8k
Lipo: 2-4
NiMH: 4~12

Pinion: 11T as per suggested good for hovering and forward flight
Servos: 3 SG90 9g micro servo and HS55 for tail
Key Features & Specs:
Nylon gear
Operating voltage range: 3.0V~7.2V
Operating temperature range: -30℃ to +60℃
Operating speed: 0.12sec/60°/4.8V
Dynamic torque: 1.2kg.cm @ 4.8V; 1.6kg.cm @ 6V
Dead band width: 10us
Dimensions: 21.5 X 11.8mm X 27 mm
Weight: 9g
wire length: 15 cm
Connector type fit Futaba, JR and Hitec

Battery: SJM 11.1V 1950mAh 12/16C Lipo Li-Poly battery
Key Features & Specs:
Battery type: Li-Poly rechargeable, 3 cell (3S1P)
Manufactue: SJM
with balance charger connector
Capacity: 11.1V, 1950mAh
Continuous Discharge rate: 12C
Burst Discharge rate: 16C
Weight: 150 g
Dimensions: 100 x 34 x 23 mm

Gyro: SJM SJ-301 Head Lock Dual rate Gyro
Key Features & Specs:
Dual Mode: Head Lock and Standard rate
Built-in Drift canceling circuit: Automatically dampers any offset effects of tail rudder due to wind and helicopter movements to produce stable, constant tail stability.
Dual Position: normal / reverse direction switch.
Remote Dual Gain control by transmitter
Voltage used: 4.2v - 7v
Power Consumption: Approx 33mA
Operation Temp: -5 degree to +60 degree
Dimension: 23.5 x 21 x 15 mm
Weight: 12 g
connector type fit Futaba, JR and Hitec

Receiver: Futaba FPR127DF 7C Rx (Too Big) :-(

Here is my question:

1. The electronics that I have is it good enough or do you recommend changing something else?
2. I get a bit of vibration when spooling down the whole heli shakes why?
3. Are my battery enough? or should I start using 3S 2200mAh?
4. Rx should I replace it or just use that since I have attached a battery tray on the helimax similar to a Trex?
5. Since I dont have the spacers for my servocs I have used some nuts to give that extra spacer because my links looks like slanted.

Please advise thanks!
HeliGunner

[Raven_darkcloud]

Change the tail to an hs 56 or 65 and save some drift. The 55 is on the poor side for tail performance. The others will work good. you might want ti find a 10t pinion so you can hit the sweet spot and get longer flights.

[HeliGunner]

Thanks, I will try if I could locate a 10T pinion also where can I get this part number HMXE7381 MX450 SERVO NUT Plastic I have checked tower hobbies its a $2 part but shipping is $38 I'm in Toronto

[z_man_95]

Get these nuts at the lhs or maybe your hardware store: http://www3.towerhobbies.com/cgi-bin...?&I=LXE052&P=7

or these: http://www3.towerhobbies.com/cgi-bin...?&I=LXGKE8&P=7

Get 2mm x 8mm hex screws.

[HeliGunner]

Thanks, now for the receiver should I change it to a micro receiver as I have the big 127DF futaba?

[z_man_95]

I'm saving for this: http://www3.towerhobbies.com/cgi-bin...?&I=LXJSP9&P=V
Due to the weight, ~11g vs. ~28g. Unless you need the 7 channels...

[z_man_95]

But I have done tons and tons of research. I bought a blade cp without knowing anything, and decided not to make the same mistake on the next heli.

1. I haven't used any of what you have, so I can't really comment, but it all looks sufficient enough to get you in the air.

2. Imballance somewhere? Does is vibrate when spooling up?

3. The difference between the two batteries is weight and flight time. the 2200mAh will give you a longer flight time. How much depends on flying style, motor, esc, setup, etc.

4. I would replace it. You can find them on ebay for ~$40us. Or at the hobby shop for ~$60us.

5. Not sure about that. I'm using futaba s3114 servos and they do not need any spacers, and everything is aligned like it should be.

[HeliGunner]

Hi There,

I just spoke with my LHS and was advise to stick with my Futaba receiver as it has no big difference but look at this site that I came accross looks like its a new forum.....http://www.raverc.ca/review.php

Has anyone heard of the Flasher

[z_man_95]

It depends on what you want out of your heli. The difference in the Rx is the weight. The micro is more than half the weight of the one you have. Performance wise there is no real difference except the extra channel.
Personally my goal is to have a light and responsive heli, so I opt for weight savings, performance, followed by cost in my decision making.

[HeliGunner]

Guess my intent for now is to be able to hover and soon to do forward flights no extreme 3D's

[HeliGunner]

Does anyone know if I can use the JR RS600 receiver for my helimax its a 6 channel and according to my LSH it should work with Futaba 7cap.

I just need to know where I can get the manual for this any assistance please...

[bgagnon]

For you vibration problem, did you balance your blades. Also is your tracking ok?

just my 5 cents,

[KITEPILOT]

Originally Posted by HeliGunner

Does anyone know if I can use the JR RS600 receiver for my helimax its a 6 channel and according to my LSH it should work with Futaba 7cap.

I just need to know where I can get the manual for this any assistance please...

been using the R600 for a long time and thier bullet proof, altho the R700 is smaller/lighter....have tried the 600 in my MX450 and had some glitch problems< altho not sure if it was due to the RX, then tried just bought a berg 7P and it worked great but did have couple glitches, again may not be a RX problem

[bgagnon]

Hi Heligunner,

In the 72 mhz (North America)Futaba and Hitec are Negative shift and Airtronics and JR are Positive.... You can not mix shifts...

some transmitters can send to either shift (some Hitec and Aitronics). Some receivers detect automatically what shift the TX is sending and adjust to that.

North America is the ONLY place they do negative shift systems. Thanks to Futaba...

Short answer: you need to find an rx that will do negative shift. Sadly, R600 does not.

hth,