HK-450MT 3D Helicopter (T-Rex 450 Clone)

Started by findvikas, October 22, 2010, 04:00:49 PM

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findvikas

Jackly... yeah I have 3 of such sets comes in different packing and size... but I hate it for the same reason.. cheap metal. He tried to sell me the same for 100 buck. Never tried the Gorilla.

anwar

You can hate for any reason :giggle:  Question is... does it serve the purpose ?
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findvikas

for just couple of time.. they slip when opening thread locked screws :(

anwar

Hmm, I must have gotten lucky... doing the same things ! 

One thing to remember is that a tiny bit of loctite is what should hold the screws in place, not the pressure of your arm ;)
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findvikas

:) yep... I am using the medium strength blue loctite , what do you or others use?

findvikas

This is what I have got so far...

anwar

Quote from: findvikas on November 09, 2010, 02:01:48 PM
:) yep... I am using the medium strength blue loctite , what do you or others use?

That is the right loctite. The trick is to use bare minimum on the last 2 or 3 threads, and never to over-tighten the screws.
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findvikas

Thanks Anwar and others trying to help this novice..

vinay

Anwar, I learnt it the hard way, some screw requires a little more loctite, head screws/tail boom screw, main gear jesus bolt etc, which cant be heated with plastic parts nearby.

Align driver worked well on the first go, but on the same HK screws 2nd or the 3rd time they stripped, due to size issue. No wonder why people complain about HK screw quality. coz most use align hex driver. On the other hand MIP thorp fits perfectly on HK screws and they work well on the same screws 3 to 4 times w/o issues. I will post the difference in the head pics once I reach bangalore.

BTW I maidened my 2 birds, one with HK401 and another with gy401(my first original gyro). What a difference. the GY was plug and fly. Just wondering how the quark mks8901 combo would be on the TT 450.  :o

BTW I have jackly and its PURE CRAP! Butter is stronger  ;D

vinay

Hey BTW from the pics, the flybar weights should be on the edge(near the paddles) for beginners. Its stable there.

findvikas

Yep... that was not tight then... I moved it next to paddles... sharp eyes I must say.. thanks :)

anwar

Quote from: vinay on November 09, 2010, 03:23:30 PM
BTW I have jackly and its PURE CRAP! Butter is stronger  ;D

:giggle:  Of course you get what you pay for (:Rs: 100). But I also hope you are building RC helis, not all terrain vehicles ;)
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findvikas

So a quick fix for Jackly drivers... their metal is too soft that you can re-use its Hex bits atleast.
Take a metal file , one like this and keep filing it till the damaged part gets off... it was around 2 mins for me and I managed to fix all the damaged bits of Jackly. How kind they were to make it so soft :p

findvikas

#113
Quote from: findvikas on November 08, 2010, 07:49:46 AM
So I decided to get a Trex 450 SE v2 motor mount as well from Alien. Total order comes around 2k including shipping. Now the wait starts. :-(

This was quick, relatively, and I had the postman at my doorstep in the morning with the package. First impression... sweet... very sweet. These are made in Taiwan and not china... fits on most of the screws fine the remaining very few seem to be wrong sized screws. Also the motor mount looks like made of alloy.. very lightweight and stiff. loved it.

findvikas

I finished the build by setting up all screws with thread lock, installed 4 servos , gyro and motor... now I may need some help in setting up configuration of servos...

@Vinay... will you be able to spare some time to have a look at it and help me in finishing the build. Thanks.

findvikas

I even unscrew all the screws from rotor head (one by one) and put them back in place with thread lock (one by one). The Align Hex driver working perfect.. no slipage yet... entire build is completed (well almost entire)

vinay

have u seen finless bob videos? If not I suggest u watch them here http://www.helifreak.com/showthread.php?t=11373, BEAUTIFUL! they teach it better than I have tried to.  :giggle:

U can also give me a call.. I may be going out this evening with friends. Thread locking is the easiest part. U should always thread lock all the screws in the body after programming the head. If servos move at different speed its a nightmare to change.

findvikas

#117
Thanks for the links Vinay... they are all awesome...

Here is how it looks now and the transition.. :)


vinay

I dont know how HXT 900 holds for the tail. People have found hxt 500 to be better than hxt 900 for the tail. This should be only for simple hovering.

findvikas

I was planning a better servo for tail as well... just put it as I didnt had any other and was doing only testing. should I go for metal gear digital servo in back?

vinay

#120
In the descending order of betterness:

MKS 8910 - wont work with HK gyro. need assan converter or a better gyro.
Futaba S9257
Align DS520
Turnigy DS480- recommended.
Henge 922

findvikas

Cant find a Turnigy DS420... is that Align DS420 cause I can find that :) Please see if you can find a link over HK or some other place to buy. Should I also change the swashplate servos too ?

vinay


findvikas

thanks... I will have to wait for next month's salary for the budget for new servos... darn it.. same story with salaried class people :(

vinay

Atleast we know that we WILL get it at the end of the month  ;)