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Heads and Rotor Blades Heads and Rotor Blades Discussion


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Old 01-21-2016, 09:57 AM   #1 (permalink)
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Default Advise please om 450 scale project

Hello all,
this is my first scale build and I needed some advise on some particulars. Im working with a 450 clone that will end up in a MD-500. Ive installed the 5 blade head with the symmetrical scale rotor blades. My FBL unit is a full size Vbar 4.xx and as of now the tail is stock.
Ive set up the phasing as recommended with one blade grip 90* to the boom and its swash link inline with the rear elev swash servo ball link. It seems as i rotate the head the remaining grips do not end up 90* to the boom when the lower swash link lines up with the elev servo link. Is this normal? Im assuming they should all have the same results to the one ive adjusted.
In preliminary tests in seems my tail is way under-powered and the added main blades have an immense amount of counter-torque that the tail can not compensate for. Are bigger tail blades the answer or should i add more tail blades?
Is there some advise on the Vbar settings for scale? I assume very low main gains and low agility would be a start?

thank you
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Old 01-23-2016, 05:57 PM   #2 (permalink)
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Can you post a picture of your phasing problem? I'm having a hard time imagining what is happening, because the way I understand the problem indicates that your swash is just not symmetric, which seems impossible.
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Old 01-24-2016, 02:32 AM   #3 (permalink)
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With a slow headspeed and more blades, it is almost guaranteed that you will lack tail authority. Options;

1. Bigger (longer and/or wider) tail blades
2. #1 plus asymmetrical tail blades
3. Speed up the tail - change tail gearing
4. More tail blades

Any combination of the above.

Colin
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Old 02-01-2016, 06:57 PM   #4 (permalink)
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Hi all,
Thanks for the response. It seems the swash follower has some play allowing slight variations in phasing. I will investigate this part and possibly a gaui alternative I've heard works very well.
After adjusting some mechanical and HS settings the tail held much better. I had too much neg pitch at center stick.
What pitch range should I aim for with this particular setup? I assume my usual 12-14* is out of the question here with all these blades.
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TREX 700E-NEU KDE 1917-12 PINION-NEO -JR 8717 HV CYCLIC-MKS990 TAIL-ICE 160-KDE UNIVERSAL MOUNT W/PINION SUPPORT


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Old 02-02-2016, 02:50 AM   #5 (permalink)
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A 14 pitch range may be a touch light for a 450. I would suggest around -ve4-5 at low stick, and around +ve11-12 at high stick, which will give you a range of about 15-16 of total range, and about 5 at mid stick, which will just about be hovering (depends on your headspeed of course).

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