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Old Nov 06, 2012, 11:22 PM
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Joined Jun 2012
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with that power, I would just skip the retracts and hand launch it.
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Old Nov 07, 2012, 12:15 AM
Anything that gives me a High
super kupfer's Avatar
Canada, BC, Richmond
Joined Jan 2010
1,427 Posts
Quote:
Originally Posted by jefffassbinder View Post
If your bird is 7-8 pounds your airplane is going to be ballistic. I have that same fan in many of my airplanes some in excess of 25 lbs. Your airframe better be super strong as your thrust is going to be 2:1 and that should be insane. Good luck and your build technique looks great. Short take offs. But thinking about this on 12s 3.5 lbs, plus 2 lbs on fan you may not be 2:1 but very much in the 1.5:1 range which is still awesome.
I think airframe strength is about the only thing I am currently worried about, I'm currently waiting on some 1k carbon cloth to arrive so that I can address this concern but with that kind of whooosh who knows what will happen on maiden or down the road.
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Old Nov 07, 2012, 02:36 AM
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FoxausRhens's Avatar
Germany, RP, Koblenz
Joined Nov 2011
17 Posts
I will follow this thread, than I am very curious about this jet, see how it fly.
Wish you a good maiden flight, you building skills look great so I think you will fix the small problems and we will see a great very fast maiden flight.
Best regards
Alexander from Germany
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Old Nov 07, 2012, 06:27 AM
EDF Jet Jam May 2014
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
6,043 Posts
Quote:
Originally Posted by super kupfer View Post
I hope she doesn't fall apart in the air.
Light is right!

Please weigh the model prior to the first flight.
How did you cut the different carbon pcs?
The flight performace will be amazing if you acheive this weight.
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Old Nov 07, 2012, 07:53 AM
High Dynamic Thrust
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United States, FL, Mt Dora
Joined Feb 2007
2,210 Posts
with this type of power ratio. this would be a great candidate for thrust vectoring
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Old Nov 07, 2012, 09:36 AM
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USA, NC, Hope Mills
Joined Jan 2010
256 Posts
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Originally Posted by stoneenforcer View Post
with this type of power ratio. this would be a great candidate for thrust vectoring
Yes and with fully functional canards it would be awesome to fly it with thrust vectoring. It will be like a miniature of those Turbine C-ARF's Eurosport evolution we see tumbling in the Joe Nall videos, even thou is not the same fuselage but is really similar so performance and moves would be almost identical.
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Old Nov 07, 2012, 10:44 AM
Anything that gives me a High
super kupfer's Avatar
Canada, BC, Richmond
Joined Jan 2010
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Quote:
Originally Posted by Robert Belluomini View Post
Light is right!

Please weigh the model prior to the first flight.
How did you cut the different carbon pcs?
The flight performace will be amazing if you acheive this weight.
I will weigh the model once done, stay tuned.

Cutting carbon plate (my way):

1. Choose a thickness you want to work with and shape you want cut.
2. Wallpaper one side of the carbon plate with painters tape (I use the widest I can find).
3. Draw the shape you want cut over top of the tape.
4. Use a dremel with a cut-off disk to cut shape as close as you can to shape (leave some room for fine shaping/sanding).
5. Using a sanding drum bit on a dremel, sand/finish to shape (sometimes I do it by hand or I attach the dremel to a shaper table depending on the job).
6. Peal off the painters tape and clean pc off and bling bling.

It takes a bit of time but all worth at end.

Note:
I only use this technic for 1-3mm carbon plate, anything thicker gets milled at the shop.
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Old Nov 07, 2012, 07:36 PM
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Guatemala, Guate
Joined Jul 2007
226 Posts
This is a great build.....


Fallowing
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Old Nov 09, 2012, 09:43 AM
Anything that gives me a High
super kupfer's Avatar
Canada, BC, Richmond
Joined Jan 2010
1,427 Posts
OK guys, I have finished shaping the new bulkhead and ready to glue it and the ducting but before that I need to figure out the gear doors (without the ducting and fan bulkhead there is better/more room to work on the main gear doors).

I need to think about a better way of gear door actuation, maybe a sub-micro servo or a small pneumatic Cyl. (Not crazy about the old school mechanical wire setup).

LOL, but on another note there is the thought of "the hell with them" let's move on to the wings and get this jet flying already.
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Old Nov 13, 2012, 11:49 PM
Anything that gives me a High
super kupfer's Avatar
Canada, BC, Richmond
Joined Jan 2010
1,427 Posts
OK, I decided to take the easy road and ditch the gear doors (I hate doing gear doors anyways.......they can be a pain in the as at times).

- New bulkhead installed (The #68 on the plans).
- Ducting installed (Still need to finish the intake lips).


Next is installing the TJ120 EDF unit in and I have a few questions.

1. I'm not planning to use Tam's mounts (too much in the way, need a cleaner mount), I want to make/use the same mount style as on the new Schubeler HST, What thickness of carbon plate should I use??? would 3mm be enough???

2. What size screws should I use to scure the fan to the fuse??? On my first Rafale I used 3mm when I installed the original TF4000 unit, Should I go with 4mm given the amount of power the TJ120 produce???

My first 12cell setup, any feedback would be appreciated.

I'm thinking YES to both questions but want to confirm.
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Last edited by super kupfer; Nov 14, 2012 at 01:47 AM.
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Old Nov 14, 2012, 01:49 AM
Neil Jarvis
Neil Guildford's Avatar
Surrey U.K.
Joined Sep 2004
1,999 Posts
My DS-77 hst on 14s was held in with 3mm screws. I think 3mm would be enough.

I have used only the two included side lugs with the TJ120. I used the rings to set the positions and then removed them after the glue had dried. I used 30 min epoxy.
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Old Nov 14, 2012, 01:53 AM
Anything that gives me a High
super kupfer's Avatar
Canada, BC, Richmond
Joined Jan 2010
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Quote:
Originally Posted by Neil Guildford View Post
My DS-77 hst on 14s was held in with 3mm screws. I think 3mm would be enough.

I have used only the two included side lugs with the TJ120. I used the rings to set the positions and then removed them after the glue had dried. I used 30 min epoxy.
Thanks a bunch, the rings are just a bit too much for my tight setup.
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Old Nov 14, 2012, 01:55 AM
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Richmond B.C. Canada
Joined Aug 2006
542 Posts
Super, where are you planning to fly this? Ridge?
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Old Nov 14, 2012, 02:17 AM
Anything that gives me a High
super kupfer's Avatar
Canada, BC, Richmond
Joined Jan 2010
1,427 Posts
Quote:
Originally Posted by 172AMD View Post
Super, where are you planning to fly this? Ridge?
Not on the maiden but they do have about 500' of a nice cut runway (as good as a golf fairway).

Can't say at this point as the biggest problem in Ridge is the limited airspace.
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Old Nov 14, 2012, 09:49 AM
High Dynamic Thrust
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United States, FL, Mt Dora
Joined Feb 2007
2,210 Posts
please please record a video of the maiden. im really looking forward to this.
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