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Old Jan 30, 2013, 12:20 AM
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Dirty Dee's Avatar
United States, IL, Northbrook
Joined Sep 2011
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Fixed up the two-seater a bit. Gotta say that one is starting to grow on me.

The hotswap idea could possibly work without doing major changes to what I have currently. I think I have something in mind as to how to implement it.

Still a bit of a ways of from getting a decent number, but I'm thinking this will have somewhere around a 10-15lbs AUW. Not sure what battery setup, and whether to go for 6S or 8S for the 12 blade changesuns. Have a bit of reading to do in the thread.
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Old Jan 30, 2013, 02:20 AM
I fly Helis too!
Keenan smith's Avatar
United Kingdom, London
Joined Dec 2010
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If your going 6s in the cs 90 then go for a 1500kv motor and 110A esc, if your going 8s then go 1350kv with a 150a Esc

K
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Old Jan 31, 2013, 06:05 AM
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Ventress, Louisiana
Joined Oct 2007
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Still a bit of a ways of from getting a decent number, but I'm thinking this will have somewhere around a 10-15lbs AUW. Not sure what battery setup, and whether to go for 6S or 8S for the 12 blade changesuns. Have a bit of reading to do in the thread.[/QUOTE]

How about this set up, RC Lander 12 blade fan 1000kv motor can be run on 8
9 or 10 cells, impressive thrust 3.6 kg to 4.6kg. Would be worth looking at, will be putting one of these in my Fly Fly F-100.
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Old Feb 01, 2013, 01:22 AM
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St.Catharines, Ontario
Joined Jan 2009
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the fans seem good. probably cheaper through Hobby King.

the twin seater just oozes cool. I gotta have one, some day.
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Old Feb 01, 2013, 12:37 PM
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United Kingdom, Birmingham
Joined Jan 2013
179 Posts
Hi Dirty Dee,

I just wanted to say that this is some seriously good CAD / design work!

Keep up the great work
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Old Feb 01, 2013, 01:10 PM
“Do it Right The First Time!”
CoolerByTheLake's Avatar
United States, MN, Hermantown
Joined Dec 2008
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Quote:
Originally Posted by Keenan smith View Post
If your going 6s in the cs 90 then go for a 1500kv motor and 110A esc, if your going 8s then go 1350kv with a 150a Esc

K
A 150A ESC?? Over kill, isn't it? Look at the numers on this set-up.


Re: HET 700-68-1680 /JetFan 90
--------------------------------------------------------------------------------
I'm using 1,5 year old Turnigy Nanotech 4s5000 (45c/90c) 2x.
This setup pulls about 110amps at 3,25KW.
It's hard to say how much thrust it generates.
Inflight the Jetfan produces visibly more then shown in the graphs of ejets. I experience similar in my Habu.
A HET 700-68-1500 on 8s would be enough for good flight performance but for grass takeoff more power is welcome.
The setup perfoms fine but my next setup would be
10s4500 on HET 700-68-1200.

Grtz,
Emile
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Old Feb 01, 2013, 08:18 PM
I fly Helis too!
Keenan smith's Avatar
United Kingdom, London
Joined Dec 2010
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The CS90 is an Amp Hog!
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Old Feb 02, 2013, 12:52 AM
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St.Catharines, Ontario
Joined Jan 2009
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as are all multi blade fans. if you want efficient, you go with less blades. if you want good sound, you sacrifice Amps for sound. just the nature of the beast. in a plane like this, I'll sacrifice Amps for a cool sound.
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Old Mar 03, 2013, 02:12 PM
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United States, IL, Northbrook
Joined Sep 2011
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Got back to working on the model. fuselage is mostly complete. added servo pockets to the elevators and rudders.fixed up the canopy since what i had before would cause issues when vacuum forming. the canopy will be pulled twice. the first pull will be the canopy portion. then the excess plastic will be trimmed, put back on the mold, and then pulled again. the second pull will be trimmed to be the canopy framing.


Still need to mess around with rib layout and possibly changing some out to balsa since it looks like this is going to be on the heavy side, maybe closer to 12lbs AUW.
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Old Mar 19, 2013, 12:22 AM
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Dirty Dee's Avatar
United States, IL, Northbrook
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small update.

Been working on not having this so overbuilt and trying to lower the weight. managed to get it down about 1 3/4 lbs so far. Closer to ~10lbs AUW now.

Playing around with the retracts and I'm deciding that I'm going to go with the Robart 510RS air up/spring down set. This will give me some wiggle room and be able to install blocks to restrict the movements as it retracts up. The nose gear bay is pretty tight.

also made a Nanotech 6S 5000mAH battery to see how it fits in the bay.
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Old Mar 19, 2013, 06:07 AM
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meerkat13's Avatar
United Kingdom, Birmingham
Joined Jan 2013
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Nice work and well done on the weight saving... it doesn't half add up!

Looking forward to your next update.

Steve
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Old Mar 19, 2013, 03:31 PM
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SDF
Joined Sep 2002
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Looks great. What's left for you to do before you start cutting?
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Old Mar 19, 2013, 11:39 PM
Tijuana Mexico
Mig29's Avatar
Tijuana Mexico
Joined Jul 2006
120 Posts
Looks perfect

I like your design my design is still in the work any tips I will appreciate.
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Last edited by Mig29; Mar 19, 2013 at 11:45 PM.
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Old Mar 20, 2013, 01:59 AM
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darook's Avatar
Johannesburg, South Africa
Joined Apr 2006
469 Posts
Quote:
Originally Posted by Mig29 View Post
I like your design my design is still in the work any tips I will appreciate.
Nice!! What are you using? CAD, Sketchup?

I used sketchup for my beaver build but would like something more cad oriented. Anything that does not cost loads you guys could recommend?
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Old Mar 20, 2013, 12:30 PM
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Dirty Dee's Avatar
United States, IL, Northbrook
Joined Sep 2011
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Quote:
Originally Posted by FOShowNoClass View Post
Looks great. What's left for you to do before you start cutting?
Vertical and horizontal stabs are 99% with only some minor tweaks needed prior to nesting for cutting. I was debating making the horizontal stab removable to aid in rewiring if a servo went bad in the tail. may just use some rolled paper for conduits and run some pull cable prior to sheeting and glassing. Need to keep weight down.

Quote:
Originally Posted by Mig29 View Post
I like your design my design is still in the work any tips I will appreciate.
Hey Mig. I remember following your original A-10 build thread. from what it looked like, you sketched all the ribs and formers individually. What I would suggest is make a solid/surface model of the plane, and then use intersection planes to get the outlines. Lots of threads and videos made showing this approach (I think D_Fast has a video of his workflow).

here is a good solidworks-specific thread going from start to finish:
http://www.rcgroups.com/forums/showthread.php?t=1227712


darook, maybe you can check out Alibre Design:
http://www.alibre.com/products/hobby/
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