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07-20-2006 11:02 PM  14 years ago
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Intruder

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McHenry, Illinois

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07-20-2006 11:08 PM  14 years ago
Intruder

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McHenry, Illinois

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07-20-2006 11:36 PM  14 years ago
vsnyder8

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Ft Wayne, IN

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I have been looking at the new belt drive system at Helidirect for my blade cp. Planning on installing seperates along with hs55's.

This evening I talked to an align rep at my lhs and he told me the micro heli's have some problems when converted to belt drive, due to higher head speed needed to lift the extra weight, he said I would get better results with a brushless rear with direct drive blade in back.

His theory is with a 5:1 ratio front to rear blades I need a very high head speed to lift hence a very fast rear blade and a yo yo affect.

I am curious what people that have done these conversions feel about the results.

Thanks
Van
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07-21-2006 12:17 AM  14 years ago
Intruder

rrApprentice

McHenry, Illinois

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07-21-2006 12:46 AM  14 years ago
Intruder

rrApprentice

McHenry, Illinois

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07-22-2006 09:45 AM  14 years ago
Skiddz

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Carlsbad, CA

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Where does the tail rotor get its power in a belt drive setup? The same place the mains get theirs. If the tail is working hard, it's sucking power from the drive train and slowing the head slightly. That will cause less lift to be generated. Conversely, if the tail isn't working hard, headspeed increases and lift increases.

In full scale, made in the USA helis, (i.e counter-clockwise rotating mains) a left pedal turn in an out of ground effect hover takes more power than a right pedal turn in the same out of ground effect hover. The reason is to make the left pedal tuen, you need to increase the TR's thrust to counter the torque of the main rotor. In the right pedal turn, TR thrust is decreased and it's actually main rotor torque turning the helo, not TR thrust. (well, not entirely accurate, but in effect this is true)
A helicopter is 10,000 parts spinning rapidly around an oil leak.
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07-22-2006 12:18 PM  14 years ago
vsnyder8

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Ft Wayne, IN

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I think the rep at my lhs knows what he is talking about, somewhat. He is a kid, (under 18) he doesn't have the schooling or military background to fully understand these things, but he has been flying rc models since he was about 4yrs old.

I think he has heard or seen problems like Skiddz mentioned. Added weight means higher head speed which means faster tail which means you need a little smaller tail rotor, so you don't bog down when it bites air. The head of the blade cp has shims and/or washers which if to tight creat intermittent drag and yo yo, especially at high head speeds. The blade cp was not originally designed for a belt driven tail.

I understand some of what he was saying but I think he(the kid at the lhs) was maybe overthinking the situation and figured a direct drive tail w/motor only draws amps from the battery, not power from the main blades. I am not sure which has the most benefits or drawbacks.

Van
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07-22-2006 05:57 PM  14 years ago
Skiddz

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Carlsbad, CA

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Whether the power is being used mechanically or electrically, the TR is still sucking power.

I run a DD tail on my CP and in a hard right hovering piro, the thing will sink a little bit as the tailmotor draws from the battery. It's just a little bit, but it's still there. Obviously it's not as noticable on a freshly charged pack, but as the pack discharges, the effect is more pronounced.
A helicopter is 10,000 parts spinning rapidly around an oil leak.
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