HK-450GT Pro 3D Belt-Drive Electic Configuration

I've used the D933MG servos on my HK 450 Pro, and they've been pretty good. I decided to try some 922's for my next build. At the same time, I acquired a servo tester, so I thought I'd run a few speed tests.

I was horrified to see that the 922's only manage 0.14s @ 5.09v , and 0.135s @ 5.9v. That's a LOT slower than the spec, which claims 0.09 @ 4.8v and 0.07 @ 6v.

To my surprise, my 933's gave almost exactly the same result.

By contrast, the cheap HK15158A 9257 clone performed almost up to its claimed spec - MUCH faster than the 922 and 933.

So I'd say the 922 or 933 will be fine for cyclic, but you should try to find something faster for the tail. If the mount will accept the 15158A, it's really good value for money.

OK, I'll do it, spare parts, help y simulator.

Nice idea to modify pinion and blades to learn. Thanks.

opps incomplete post

you will crash you need a simulator and an instructor.    someone who will teach you both how to setup the heli and how to fly.

But even with that you will crash.   It is not possible to learn to fly these with out crashing

I started with a similar set up but quickly changed to cheap wooden blades and a 10t pinion for learning basic flying skills. This way you virtually eliminate the danger (pucker factor)to yourself, others, and stray pets. The woodies end up in a cloud of confetti if you hit something. They absorb the shock and your head assembly will generally survive apart from a bent feathering shaft or mainshaft.

Woodies are available on ebay in packs of 10 or 20 pairs of matched blades. They are cheap. RPM is restricted to 2200 - 2400 so you need a smaller pinion to achieve this.

Cheap fibreglass and plastic blades are an unknown quantity in as far as quality goes and they do fly apart and cause nasty injuries if you fly into yourself.

I would not go for the current HK 401B gyro - Major problems reported throughout the forums.

Almost identical but with better quality sensors is the Detrum - not available from HK.

Mount your gyro under the tail tube block - not on top. The flybar paddles will take it out if you do a real hard landing - and you will.

If a cheaper barebones kit of your heli is ever on offer grab one and use it as your spare parts kit and reorder any bits you use.

see my posts in this section re trainer gear to prevent smashing up you project the first time you power it up. Well worth it.

Download Electric Heli Guide for Beginners from the files tab on the HK 450 GT Pro page