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HomeAircraftHelicopterAerobatic FAI F3C F3N Contest › New Hirobo Turbulence D3 for FAI
10-23-2009 05:50 PM  8 years agoPost 1
blt4ice

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Newark, DE

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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

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10-24-2009 03:48 AM  8 years agoPost 2
joec

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VA

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Where's all the hirobo guys? Ben, Gordie, George? Can't you help out?

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10-24-2009 04:43 AM  8 years agoPost 3
blt4ice

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Newark, DE

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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

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10-24-2009 04:51 AM  8 years agoPost 4
joec

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VA

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Wow... That was quick....

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10-24-2009 10:50 AM  8 years agoPost 5
GM1

rrElite Veteran

Tallahassee, Florida US

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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.

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10-24-2009 03:46 PM  8 years agoPost 6
nighttrain

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Louisville KY

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I don't think the D3 will go into a Staysee fuse, the tail boom is too low.

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10-24-2009 06:19 PM  8 years agoPost 7
Dr.Ben

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Richmond, VA, USA

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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

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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10-24-2009 06:30 PM  8 years agoPost 8
joec

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VA

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Interesting... I didnt realize that the D3 didnt offer a gearing option for F3C....

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11-02-2009 01:25 PM  8 years agoPost 9
LoveMyTrex

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Hamilton,VA

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what gear ratio do most of you use for F3C? 8.0?

600N 55HZ/SAB-55 600V's
700N 91HZ/SB-20 690V2 V's
90SG 91HZ/SB-20 710V2 V's

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11-09-2009 04:34 AM  8 years agoPost 10
Dr.Ben

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Richmond, VA, USA

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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

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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02-02-2010 12:26 AM  8 years agoPost 11
FP-C Medic

rrApprentice

North Carolina

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So Ben, the Turbulence won't fit into any fuse that you know of?

Does anyone know if Hirobo plans to maybe offer a different pinion or is there a different main gear to change the ratio at all?

Paramedic
If you bleed, I can fix it...

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02-10-2010 02:58 PM  8 years agoPost 12
FP-C Medic

rrApprentice

North Carolina

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So will any other main gear work on a D3 to change the ratio, like maybe one from the Freya/EVO??

Paramedic
If you bleed, I can fix it...

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02-10-2010 03:51 PM  8 years agoPost 13
cmir2425

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miami, fl usa

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They won't work. Totally different gears.

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03-28-2010 05:27 PM  8 years agoPost 14
chat1

rrNovice

Sweden

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Hl
I have made a new part to the D3 so I can change the ratio to 7.91..
I have pictures of it in my gallery.
T.J

[/PHOTO]

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03-28-2010 10:32 PM  8 years agoPost 15
FP-C Medic

rrApprentice

North Carolina

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That is interesting......

Paramedic
If you bleed, I can fix it...

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03-29-2010 01:07 PM  8 years agoPost 16
GootyS

rrApprentice

Gauteng South Africa

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Gear ratio
what makes the 7.9 gear ratio from a 8.1 is it less teeth? I have never taken not of gear ratios, just flow what comes with the machine. Whats the advantages of running a 7.9 compared to a 8.1 or vise versa. maybe even point me to this topic if its been discussed before, im keen to read about this.

Thanks guys.

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03-29-2010 01:31 PM  8 years agoPost 17
Salesmanheliboy

rrVeteran

Nashville, TN

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The 91 engines perform well at 7.9 ratio while the 8.1 runs the engines a little high in the aerobatics.

I'm using 7.75 and would really like to have that option.

Tim

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03-29-2010 03:13 PM  8 years agoPost 18
FP-C Medic

rrApprentice

North Carolina

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Well the stock ratio is 8.25:1, so I'd like to get it down around 7.9...

Paramedic
If you bleed, I can fix it...

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03-29-2010 05:20 PM  8 years agoPost 19
Dr.Ben

rrMaster

Richmond, VA, USA

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If you made a few extras of that part, you might be surprised at the demand for some to buy them from you.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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03-29-2010 06:16 PM  8 years agoPost 20
chat1

rrNovice

Sweden

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Ben
I will test fly next week,if it goes well I might make a few more.

Tord J

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