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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › CD industries fenestron
06-22-2009 04:39 AM  11 years ago
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Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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CD industries fenestron
okay so CD isnt a real company making a fenestron but it sounds good.
anyway, i aquired some time back, a vario EC135 fuse, the smaller one for 60 size engines, no longer available from vario. as we all know, the vario stuff is on the higher end of the price scale which forces me to make my own parts. the fenestron has always fascinated me both on the fullsize and on models and i thought i would give designing and building one of my own a go. of course using available parts help to keep the machinework to a minimum and since my junk box has more stuff than i can keep track of sometimes, it proves to be very resourceful. after much experimenting and head scratching i have managed to make a sort-of-a fenestron for my ec135 without spending too much and compromising appearance. the blades are a bit wider than you'd expect but a set that is narrower in width is under way on the manufacturing table. gears to speed the system up is also handy and waiting to be installed. the setup shown is using the std ratio of the xcell t/r gearbox and works extremely well at low rpms all the way thru healthy headspeeds. the diameter of the disc is the same as that of the vario as i wanted to use it without changing anything on the fuse's tail section. flight test were done in calm and windy conditions and performed very well in both. next i will install in the fuse and see how it does with the shroud around it. first i will fly it with the thinner blades to see how they do. the only part machined was the center hub, the grips are form a kalt enforcer and that large pitch plate is a big circular arm for futaba servos. lucky for me i think they made it knowing i would be needing it for this

drive a rotary, fly a rotorcraft
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06-22-2009 06:13 AM  11 years ago
Hoverup

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Golden Gulf Coast - USA

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You always come up with the greatest home brews Doc. Your approach proves the KISS priciple yet again. Keep us posted as you continue development.Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired
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06-22-2009 12:57 PM  11 years ago
BarracudaHockey

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Jacksonville FL

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I love the servo wheel hub cap!Andy
AMA 77227
http://www.jaxrc.com
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06-22-2009 01:42 PM  11 years ago
RaptorEngineer

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Aguadilla, Puerto Rico

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Imagination
Imagination and creativity is the most powerful tool. Great work!
If I doing this design; I use a layer of FG over the blades to be sure the wood doesn’t fail in the root/bolt area. Again congrats for your creativity. Continue post your project progress.
if it ain't broke, it doesn't have enought features yet"
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06-22-2009 02:06 PM  11 years ago
Dr.Tim

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Mojave Desert

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Another 'Mona Lisa' from my good friend Emily!!!! This one is sure to get the attention of Hally Barry for sure .. can't miss with this one buddy!! Just bring her to IRCHA with you .. I want to meet her too!

Looks Great Emile!! Well done and I love the "E!" on the blade ..
From Simple minds come simple ideas! Approach Engineering
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06-22-2009 03:47 PM  11 years ago
coptercptn

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Mesa AZ. USA

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Just exactly how much of that old "Kalt" stuff do you have Emile????...LOLHome of the "Sea Cobra".....
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06-22-2009 07:12 PM  11 years ago
Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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oh my junkbox is, er, was full of a lot of heli goodies goodies from the 90"sdrive a rotary, fly a rotorcraft
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06-23-2009 01:16 PM  11 years ago
Super-Hornet

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Singapore

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That is damn cool!!!

Is it possible to shrink it down to 450 size
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06-23-2009 02:24 PM  11 years ago
v22chap

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Granger, Indiana

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That is just great Emile ....Look forward to seeing it at IRCHA .... just when I think I have seen everything from you ,,,, you pop up with another idea ...Larry C ----------Bergen R/C helicopters
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06-24-2009 07:21 PM  11 years ago
Copter Doctor

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oh just wait, i got a bunch "O" stuff on the drawing board, just you wait!!
too much time to daydream about stuff while i am working i guess
drive a rotary, fly a rotorcraft
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06-24-2009 07:36 PM  11 years ago
BarracudaHockey

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Jacksonville FL

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The McGyver of helicopters thats for sure.

Emile, does it sound weird? I know a full scale Fennestron thats in the shroud makes a very distinctive sound.
Andy
AMA 77227
http://www.jaxrc.com
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06-24-2009 07:39 PM  11 years ago
FloridaHeli

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jacksonville, florida

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Doc,

You might want to try some shortened 450 main blades; like from a crash or something. If you don't have any ask us and maybe we have some damaged blades you can use. Especially if you can get some Carbon Fiber blades. Just might do the trick and look good too.
This hobby is WAY too expensive!!
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06-25-2009 12:14 AM  11 years ago
Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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Cuda, so far, no rc heli's fenestron has ever sounded funkey to me like the real ones. not the vario or the hirobo. the cinescale one i have never seen in person so i dont know. this one of mine is no exception but we will see when i put it in the shroud. i sure hope it does. Darrell has an electric dauphin from vario and it sound slightly like the fullsize but not very loud.
Florida Heli, thanks for the offer i just may take yo up on that. lets see where my experiments take me
drive a rotary, fly a rotorcraft
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06-25-2009 12:27 PM  11 years ago
Heli143

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Phenix City, Alabama

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very cool Emile!
you never cease to amaze me with your project ideas.
Roy Mayoral
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06-25-2009 02:30 PM  11 years ago
cgflyer

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Boca Raton, FL

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Hi Emile, I met you at IRCHA 2007 when you had the incident with your Blackhawk. My Dauphin does have the distinctive sound from the tail like the full size. This is due to the minimal blade clearance with the shroud and the blade spacing. We (the Coast Guard) have recently upgraded the tail rotor on the HH65 to offset the spacing on the blades. It it suppose to increase efficiency but unfortunatley, it sounds like a weed wacker and does not have the familure fenestron sound anymore. As you know, once you enclose the blades in the shroud your tail authority will change. I have done alot of fabrication with my scale as well so I really enjoy watching your new projects. Keep up the great work!

Rich
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06-25-2009 09:10 PM  11 years ago
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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hey yeah i remember you. i didnt remember paying attention to the sound of your fenny but i do remember your impressive flying and a well deserved placing. yeah i will be making the system with a close fitting shroud and hope to get that high pitched whine.
hate that the new technology on the fenestrons make them quiet as thats what ggives the dauphin its character. i have heard the ec135 and 155 and they are just too quiet. i have also noticed the two groups of four blades opposing each other and the single blade that separates them on either side. real funkey design work by those europeans but its queter which is a good thing.....i guess
will keep everyone posted on this project as i get time to do stuff with it.
drive a rotary, fly a rotorcraft
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