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SAB Goblin 630/700/770 SAB Heli Division 630/700/770 - Goblin Helicopters Factory Support


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Old 02-15-2018, 03:48 PM   #1 (permalink)
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Default Three bladed tail.

Hi guys! Bought two helicopters. I want to put three bladed a tail and to twist with turns of 2250 on the head! (the head two bladed) there Is such experience? The tail won't tear off?


Blades 3 * 105. I am afraid vibration will destroy a tail.

It is possible to put from GOBLIN 700 KYLE STACY EDITION



Trioblin by Пётр Кокорев, on Flickr
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Old 02-16-2018, 12:24 PM   #2 (permalink)
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This may give some perspective of how robust the SAB Goblin 3-blade tail assembly is.

The Goblin 700 KSE is designed with a 1:5.29684 tail gear ratio. The stock tail blades are 115mm and each one weighs between 7.76 g and 7.88 g. The manual suggests not to exceed 2000rpm head speed. With this 2000rpm head speed, the tail would spin those 115mm tail blades at 10,590rpm. With your shorter 105mm tail blades, you should safely be able to spin the head faster than that.

So, figure out the tail gear ratio of your heli, and take it from there.
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Old 02-17-2018, 06:08 AM   #3 (permalink)
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Guys who be flew on three a bladed tail with turns of 2250?
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Old 02-17-2018, 06:36 PM   #4 (permalink)
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I have spun mine with a two bladed head up to 2300hs for years now running a tri tail but that was an RC Tek version. I outfitted one of my G700s last year with a Sab tri tail running at 2200hs and is fairly quiet with a variety of different cf blades, the only ones that are noisy and do vibrate more are the Kbdd plastics. Which I do run from time to time when flying on rough terrain. Tri tails usually run with around 80% less tail vibes than almost any traditional two blade tail if the blades are reasonably balanced.
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Old 02-19-2018, 11:35 AM   #5 (permalink)
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Many thanks friend!

Prevy flight.


Облёт! (2 min 49 sec)




Летаем в Звенигороде by Пётр Кокорев, on Flickr
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Old 02-19-2018, 01:15 PM   #6 (permalink)
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Beautiful
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