Need help for tricopter build.

[mareks166]

Hello to everyone!

Need little help for tricopter build.I am thinking of building a tricopter but can't decide how long arms to use - 375mm,300mm,480mm or other size and which material to use -wood,carbon fiber tubes, aluminium?
I need a tricopter that could take on board pretty heavy camera (200 gram) + FPV system.

Here are electronics that i think to use, if something isn't right or you would recommend something better,then do it.

Control board KK2.1 - http://www.hobbyking.com/hobbyking/...ntrol_Board_With_6050MPU_And_Atmel_644PA.html

Programming device - http://www.hobbyking.com/hobbyking/...Programming_Device_for_ATMEL_proccessors.html

Motors DT750 - http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=6247&aff=398199

ESC Afro 20Amp - http://hobbyking.com/hobbyking/stor..._Motor_Speed_Controller_SimonK_Firmware_.html

Props : Give me recommendations, which brand props to use, size i need - 11x4,7 and 10x4,7

Battery Turnigy 2200mAh 3S 35C - http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10383

OR

ZIPPY Compact 2700mAh 3S 35C - http://hobbyking.com/hobbyking/store/__21396__ZIPPY_Compact_2700mAh_3S_35C_Lipo_Pack.html

BMS-385DMAX Digital Servo -
http://www.hobbyking.com/hobbyking/...gital_Servo_Metal_Gear_4_2kg_15sec_16_5g.html

Front wheel - http://www.hobbyking.com/hobbyking/store/__8432__Front_Wheel_Steering_Arm_Mount_Set_40mm_5sets_.html

Thanks!

P.S. Sorry for my english..

 

[mareks166]

Anyone?

 

[Tritium]

11X4.7 Props and use the Zippy battery is my suggestion. You will need a matching connector for the distribution board (to mate with the battery) OR a connector for the battery to match the existing connector on the distribution board.

Everything else we have already discussed via PM.

Thurmond

 

[mareks166]

How long arms to use and from what material?

 

[Craftydan]

Which material? Cheap.

you'll likely break it (hard to find booms you can't damage beyond re-use), so make sure you can replace it cheaply from a local source.

How long? longer arms work against agility (not a bad thing when learning), but can make the craft sluggish to respond (Ok, that might be bad for learning).

Start with long booms, and mount the motors on the ends with zipties. Try them out for a dozen or so packs, then move them in 20cm or so and try them again. when you've found the boom length you're happy with, trim and enjoy.

 

[mareks166]

Setup UPDATE:

NTM Prop Drive 28-36 750KV / 265W -
http://hobbyking.com/hobbyking/store/__19611__ntm_prop_drive_28_36_750kv_265w.html

Hobby King 20A ESC 3A UBEC
http://www.hobbyking.com/hobbyking/store/__15202__hobby_king_20a_esc_3a_ubec.html

Slow Fly Electric Prop 11X4.7SF
http://www.hobbyking.com/hobbyking/....html?strSearch=Slow Fly Electric Prop 11X4.7

Turnigy MG90S Metal Gear Servo (What you guys think about this servo?)
http://www.hobbyking.com/hobbyking/...90s_metal_gear_servo_1_8kg_13_4g_0_10sec.html

ZIPPY Flightmax 2200mAh 3S1P 40C
https://www.hobbyking.com/hobbyking/store/__9942__ZIPPY_Flightmax_2200mAh_3S1P_40C.html

Question.

What props do i need, counter rotating and normal rotating or i can use 1 type of props?
What wires do i need to connect receiver to board and, board to servo if my tricopter arm length will be 350mm from center to motoraxel?

Your thoughts about this setup?

 

[Craftydan]

Looks like a fair setup for a slow but medium lift platform. Prop/motor/ESC look like they're well matched.

You can go with only one rotation prop, but performance suffers. Unless you have a lot of experience flying rotorcraft, you're going to break props regularly, so it's not a bad investment to buy *at least* three packs (two CW in two colors, and one CCW to match), and enough to refit the tri *at least* three times (12 props). you'll use them faster than you'd like.

 

[Craftydan]

On connectors -- 5 male-male servo extensions to connect to the RX.

If your ESC servo leads are too short, you'll need extensions for those as well -- how long? dunno -- no idea how long the ESC leads are or even where you're putting them. If you plan on mounting them to the booms, you'll need them.

You'll probably need 16AWG silicone wire, I'd recommend getting both red and black -- don't want to connect anything up backwards A power distribution board can tidy things up a bit, but that's optional.

For a tri, you'll need 15 pairs of 3.5mm bullet connectors for the ESC's (5 for each), shrink tube and a male XT-60 plug -- that and the requisite soldering gear to make use of all these parts.

 

[mareks166]

Thanks. And what you can say about Turnigy MG90S Metal Gear Servo, is it good?

 

[Craftydan]

Mareks,

Didn't answer because I don't know. Servos are very finicky for tri's -- the spec's don't tell us what we need to know to say this would be good for a motor tilt or not. If someone has recommended this one or used it successfully in a build log, it should be fine, but I personally, haven't.

BTW, Nobody wants to waste money on parts that are useless, but most of the suggestions you find around here on this thread and others are suitable (and if they're not, someone will speak up and explain why). I understand the desire to have the perfect first Tri that will last forever, but booms break, motors become damaged, and parts wear down -- not quickly, but faster when you're learning. Relax -- if we'd seen anything that was a sure path to failure, we'd warn you. Believe me, turning less than ideal into nearly perfect is a part of the fun!

 

[mareks166]

OK. And what about boom length, is there any need to make 1 boom longer than 2 others?

 

[Craftydan]

Mareks,

Asked and answered -- see post #5 on the previous page.

 

[mareks166]

Looks like a fair setup for a slow but medium lift platform.....

Medium lift platform, that is how many grams, in your opinion?

 

[Craftydan]

In grams? Quite a bit. Dunno how heavy your frame or gear is, and just becasue it can struggle to lift it doesn't mean you'll like the flight time or performance.

If you wanted to mount a DSLR, I'd say no way and it's foolish to learn to fly while carrying expensive, heavy, fragile camera gear around, but that's not what you want to do, right? A gopro (or similar) and a typical FPV rig shoud lift fine with enough performance to fly well. Just keep in mind, lighter payload and frame means longer flight time. I'd also wait until I get to the "rarely crashes" skill level before I mount any extra gear.

 

[mareks166]

In grams? Quite a bit. Dunno how heavy your frame or gear is, and just becasue it can struggle to lift it doesn't mean you'll like the flight time or performance.

If you wanted to mount a DSLR, I'd say no way and it's foolish to learn to fly while carrying expensive, heavy, fragile camera gear around, but that's not what you want to do, right? A gopro (or similar) and a typical FPV rig shoud lift fine with enough performance to fly well. Just keep in mind, lighter payload and frame means longer flight time. I'd also wait until I get to the "rarely crashes" skill level before I mount any extra gear.

Yeah,it's right, i dont want to fly with DSLR.
And what about FPV system, what is the cheapest FPV system to fly up to 1km?
Do you know how to center servo without servo tester?