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Ron’s HeliProz South . MTA Hobbies . Model Rectifier Corp

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Aerobatic FAI F3C Contest > New Hirobo Turbulence D3 for FAI
 
 
blt4ice
Key Veteran
Location: Newark, DE

My Posts This: Topic  Forum		Has anyone used one of these for F3C? Fuse installation and which one? Also is the head good enough for F3C or would that need to be upgraded? Just wondering if I should keep mine and convert it to a FAI bird or sell it and try something else.

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar
10-23-2009 05:50 PM
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joec
Senior Heliman
Location: VA

My Posts This: Topic  Forum		Where's all the hirobo guys? Ben, Gordie, George? Can't you help out?
10-24-2009 03:48 AM
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blt4ice
Key Veteran
Location: Newark, DE

My Posts This: Topic  Forum		I'll leave it up for the discussion and the fun of it. But I traded it for a 90sg

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar
10-24-2009 04:43 AM
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joec
Senior Heliman
Location: VA

My Posts This: Topic  Forum		Wow... That was quick....
10-24-2009 04:51 AM
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GM1
Elite Veteran
Location: Tallahassee, Florida US

My Posts This: Topic  Forum		Too late

The SSZ-IV head can indeed be made usable for F3C. Dr Ben and I spent quite a bit of time with it and after figuring out the correct (or at least near correct) flybar ratio and the installation of the soft SDX dampers, it does quite well. I know the standard Hirobos like the Evo, EX2, and Eagle 3 will fit nicely in the Blackshark and Staysee series fuselages but I don't know the vertical measurement of the D3 so cannot say for sure it will fit. I bet it would.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.
10-24-2009 10:50 AM
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nighttrain
Senior Heliman
Location: Louisville KY

My Posts This: Topic  Forum		I don't think the D3 will go into a Staysee fuse, the tail boom is too low.
10-24-2009 03:46 PM
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Dr.Ben
rrProfessor
Location: Richmond, VA, USA

My Posts This: Topic  Forum		I tend to agree with Doug. The issue isn't so much the front end of the model as it is the tail boom height.

The other big issue for this model right now for FAI is the limited motor gearing option. The stock ratio really is too short for the engine to drone well in hover and to keep the engine RPM safe at 2K RPM upstairs.

Ben Minor

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines
10-24-2009 06:19 PM
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joec
Senior Heliman
Location: VA

My Posts This: Topic  Forum		Interesting... I didnt realize that the D3 didnt offer a gearing option for F3C....
10-24-2009 06:30 PM
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LoveMyTrex
Veteran
Location: Hamilton,VA

My Posts This: Topic  Forum		what gear ratio do most of you use for F3C? 8.0?

team Hobby Hangar VA www.hobbyhangarva.com
11-02-2009 01:25 PM
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ReadyHeli . Power Helis . CANOMOD

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Aerobatic FAI F3C Contest > New Hirobo Turbulence D3 for FAI
 
 
Dr.Ben
rrProfessor
Location: Richmond, VA, USA

My Posts This: Topic  Forum		7.9 to right around 8.0 seems to be ideal. There was a time when 7.75 could be used to good effect, but if the weather gets hot and the air thin, that taller ratio never really allows the engine to get up on a step and to recover from the loads applied with today's schedules.

Ben Minor

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines
11-09-2009 04:34 AM
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Ron’s HeliProz South . MTA Hobbies . Model Rectifier Corp

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Aerobatic FAI F3C Contest > New Hirobo Turbulence D3 for FAI
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