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Low Head Speed Helicopters Low Head Speed Helicopter Setups and Flying info


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Old 07-14-2016, 07:12 PM   #21
im4711
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Most blades possibly would do OK. On 500 size machine I tried at least 8 different sets ending up with Rail and Switch that allowed me to bring head speed down to 1050 rpm for cruising around and 1350 rpm for slow motion 3d. All others had issues in the 3d maneuvers.

Most often limitation simply is tail authority. Up to some level you can compensate by smooth collective input. However that smooth you may forget in a critical situation and the tail will spin around. So you better know how to handle such situation
Lowest on my HD750 was about 760 rpm for cruising around and 850 rpm for 3d. Again -> when you are down even below the 800 rpm there you need to be extremely careful with collective. On the HD750 I did not try that many other blades since the price for blades is a bit to high to get all different brands.

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Old 07-16-2016, 09:34 PM   #22
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Quote:
Originally Posted by bikneli View Post
Have you been reading about the VTXs? They look to be very good at
LHS. There is a video in the Mikado section w. them on a 690.

I will be trying at least a pair.......hopefully on the market soon.
Saw those, and would definitely like to try them when they are available. They sure look nice.
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Old 07-16-2016, 09:42 PM   #23
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Originally Posted by im4711 View Post

Most often limitation simply is tail authority. Up to some level you can compensate by smooth collective input. However that smooth you may forget in a critical situation and the tail will spin around. So you better know how to handle such situation
Feel you on that, I have had the same experience, almost crashed a couple of times when the tail went in an unexpected direction.

I am going to try some longer tail blades. When I get a chance I may change the gearing on the tail. That's one nice feature of Synergy Heli's.
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Old 07-17-2016, 06:38 PM   #24
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Sure longer tail blades or other tail pulley increase tail authority and work great for some low head speed flying. Downside -> you are tight into low rpm since the noise level would be annoying once speeding it up. My machines I never want for only low rpm. The 750 runs a full range from 850 all the way to 2200 rpm with 12s. No changes required. Thats what I like on the machine. My 500 is running from 1050 all the way to 2600 rpm and again - no change required.

Once below 1350 rpm on a 500 you will have a hard time finding a tail pulley you need for full tail authority. Also below the 800 rpm mark on the larger machines. Thats where you feel it the hard way. Above you normally do OK and can fly 3d.
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Old 09-30-2016, 01:26 AM   #25
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I know this is an older thread but if you can retro a 3-bld tail and run the same size tails X3, it's amazing what happens at low HS.
I did this on my protos Max 800 and 770 and 3 115's have tremendous authority over 2 at low speed.
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Old 10-20-2016, 09:17 AM   #26
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I agree - switching from 2 bladed tail to 3 bladed will increase tail authority a lot. That way you may only end up having lift and head stability as factor in order to bring the rpm down.
On the HD500 my lowest rpm to lift off was about 1050. I was able to flip at 1300 - 1350. However I also flipped - went inverted and switched down to 1050rpm again. Below 1000 I tried but did not generate enough lift to keep it in the air. If a bit of a wind gust got the machine it was right back on the ground. So 1050rpm was my magic number for flying and 1350 for arobatic (simple flips, rolls, piro flips ... nothing agressive).
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Old 10-26-2016, 04:43 PM   #27
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Having recently test flown my Trex 600L, I have dialed in the following governed rpm:

1390
1210
970

Rail 606mm mains
90mm tails
6S 5200 pack
Max pitch 10 degrees

1390 and 1210 are perfectly flyable with good collective management. I use the 970 rpm setting to practice fake autos and it works great. The 970 rpm will hover out of ground effect and climb out slowly but I have not tried flying around.
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