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HomeAircraftHelicopterHelicopter Main Discussion › TFModel fenestron modifications
10-22-2014 11:30 PM  4 years agoPost 1
heliadictaholic

rrApprentice

Hobart, Tasmania - Australia

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G'day Guys,

Some TFModel Fenestron owners have had problems with the tail holding. I redesigned the blade profile in aluminium, added a thrust race to each blade - and also added an aluminium upgrade actuator mount....

Joel kindly tested my aluminium design in his 800 TFModel Gazelle. You can read about his build and testing here:

https://rc.runryder.com/t731489p6/

Fenestron upgrade

Continuing on from Joel's tests of our new design fenestron blade and hub for the TFModel Gazelle. The new fenestron design has 2 normal radial ball races on each blade similar to the original TFM fenestron, but also includes a thrust race on each blade. The addition of the thrust race has made blade actuation much easier to achieve. The blade profile has also been changed. The blades have been machined from aluminium in an attempt to eliminate any possible blade distortion at high RPM. The blade mounting disc has been redesigned to accept the new bearing arrangement.

Joel tested the new blade design mounted on the stock TFModel fenestron blade hub. He achieved better air flow performance, but blade actuation was not good. While the aluminium blades are quite light in weight, they are about twice the weight of the plastic original – blade actuation in this case was not possible at high RPM.
Testing of the thrust race hub with the aluminium blades was successful. Joel has done several tests and he is happy with the result.

You may be aware that having parts CNC machined is not a cheap process – the more of each part machined in any machining run, the cheaper each part would be.
The main reason for this post is to see if there are any other TFModel fenestron owners who are having problems with the holding ability of the heli tail. I need to order parts for another fenestron and thought I would post here to see if there is any interest from any other TFModel fenestron owners in replacing their fenestron with the new thrust race aluminium version. As I said CNC machining is not cheap so the more parts I order, the cheaper the fan would be.

So If anyone is interested in getting a price – please let me know so I can get a bulk price together. I understand TFModel has partially closed down – is this correct? If they are still in operation, maybe they might be interested in contacting me and take on the new design themselves. I am happy to hand over to TFM, my 3D models. I really don’t have time to make fans as a business – I just need to put together another fan and thought we could help each other to keep the cost down…. Anyway, there are some photos of my Gazelle fenestron and parts below.

Also there is another part of the TFModel fenestron that I was concerned about and that is the mount for the blade actuator. I was not happy with the tiny screws into plastic so I had an aluminium version made. The new actuator mount is pictured as well.

As a guide, machine enough parts to make 3 fans, the cost is somewhere between $500 and $600 “per fan” – this includes 9 blades, 9 blade/bearing mounts, 1 main hub and 1 actuator mount – all aluminium. Depending on bearing costs they could be included in that cost – I need to confirm this…
There is also some hole tapping M1.5, M2 & M3 – these, I do myself.

There is also 1 “LEFT HAND THREAD” I also do this thread myself – this is to attach the belt sprocket fitting to the blade hub which is a left hand thread.

The additional weight added to the heli tail by using the aluminium parts
is about 25 grams. As an example of what 25 grams is, my glasses weigh 27 grams.....

Regards,

Jim

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10-22-2014 11:57 PM  4 years agoPost 2
Dan Minick

rrKey Veteran

Columbus, WI

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Nice!

I upgraded to the 10 bladed on my Vario, cost was comparable.

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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10-23-2014 01:04 AM  4 years agoPost 3
Mahu

rrApprentice

Panhandle , FL

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Nice looking tail.

Got any shots of the whole heli?

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10-23-2014 01:33 AM  4 years agoPost 4
heliadictaholic

rrApprentice

Hobart, Tasmania - Australia

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G'day Guys,
I have not completed my Gazelle yet - actually, when I found that some were having problems with the tail holding of the fenestron, I didn't proceed with the build - instead, I thought I would have a go at solving the fenestron problems. I am still a fairly inexperienced pilot and if I was to get into trouble with the tail, the heli would be history.
I read Joel's build and his endevour to solve his tail issues, as I am so inexperienced, I asked him if he would test my fan design. Joel said he would be happy to do the testing and we ended up with a good result....
My son and I have 2 700 blue thunders and the 800 Gazelle - that is 3 fenestrons. Following the redesign tests, I can now get back into these builds with a bit more confidence in the fans.

Jim

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10-27-2014 01:18 AM  4 years agoPost 5
raholek

rrVeteran

Zachary, Louisiana

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Machine work
Beautiful machine work.

www.redstickrc.net ama#: 968515

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10-27-2014 03:08 AM  4 years agoPost 6
icanfly

rrElite Veteran

ontario

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a bud of mine is looking to get a Blue Thunder canopy, know where I can locate one for sale? Nice work on the Fenestron tail btw.

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10-30-2014 02:03 AM  4 years agoPost 7
deanguy

rrVeteran

TX

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Wow that sucks that the stock one has that many problems.. the new Vario/Cine Scale one is really nice and holds well

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