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May 18, 2019, 01:54 AM
Slideways at warp speed.......
kiwi_craig's Avatar
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Mini-HowTo

Blade 250 CFX tail rotor upgrade


Like many of you, I found the blade 230s/250 cfx tail / tail blade to be pretty hopeless; poor hold and screams like hell when worked hard.

I really like the 250 cfx but the weak tail was quite frustrating - 45 degree tail blow outs are common

Blade just transferred the 200 srx tail blade, which was marginal even on that smaller bird, into the 230 /250. In the 230 when up you update the main motor, and the 250 even stock, tail blow outs are common.

The stock prop has a flat pitch and relied on lots of rpm to generate thrust. Problem is the bigger rotors on the 230 and especially the 250 need more holding power than what the stock prop can deliver hence the screaming tail syndrome. Dia is oddball as well at 3 1/4 “

On the 200srx I had great results using 3” DIA three bladed 3045 quad props and these also worked well on stock 230s but was working hard on the 250cfx. Even the 3056 wavy profile blade was working hard, so time for a revision !

I have been looking at 4” props but the majority are too bulky and the typical bull nose end profiles are to aggressive and overheated the tail motor. round end 4045 2 blade units are hard to find

I spotted some great looking folding 4045 twin blades props and with a bit of simple adaption these work great on the 250. !

These are also going onto the Huey and as355 scale birds

Further more being a folding design, busted tail blades are a thing of the past. The blades are stiff and generate excellent thrust and no more screaming tail. Tail hold on the 250 is miles better

the hub can be popped open and blades replaced, this just keeps getting better !

Microheli are into these big time, they also do an alloy centre hub, and replacement blades !

https://www.microheli.com/multicopte...er-series.html

https://www.microheli.com/multicopte...45-series.html

https://www.microheli.com/multicopte...pellers?page=3

https://www.microheli.com/multicopte...acket-red.html
Fluro colours, black and white units readily available for $5 for a pack of 4 at Rakon, microheli, nextrc and AliExpress.
Last edited by kiwi_craig; May 18, 2019 at 05:57 PM.
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May 18, 2019, 10:00 AM
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have you done any thrust test on each of the tail rotors with max rudder output?
May 18, 2019, 03:34 PM
Slideways at warp speed.......
kiwi_craig's Avatar
Thread OP
simple hand hold heli only, no scales. Yes - more thrust. I give it a 20 second burst full power to see if the tail is going to overheat, it was fine.

Tempted to try a triple blader on the scale bird with the triple blade rotor head.
Last edited by kiwi_craig; May 18, 2019 at 05:52 PM.


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