HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 05, 2009, 08:32 PM
Physics hate's my ideas
GreenAce92's Avatar
USA, NY, Dunkirk
Joined May 2007
3,913 Posts
Cool sounds great! good luck for building/flying to the both of yas!
GreenAce92 is offline Find More Posts by GreenAce92
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 05, 2009, 11:15 PM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,779 Posts
Assemble the Tailfeathers

The Binary-900 comes with pre-covered balsa tail pieces. There hasn't been much attention to rounding the leading edges or tapering the trailing edges - they're basically 2mm planks.

The kit comes with small CA hinges, and the plans specify where they should go. This is all very standard stuff - cut slots into the edges of the control surfaces, insert the hinges and glue with thin CA. I made some marks on the edges of the tail pieces where the hinges go to help get everything lined up properly.

The only thing I did differently was that, after cutting a slot into my thumb rather than the rudder, I decided to make a quick jig for cutting the slots. I stacked enough post-it notes on the bench to raise an xacto blade to the center of the control surface, then clamped it down to create a nifty slot cutter. Check that the cutting depth is equal to half the size of the CA hinge - that way it will be properly centered when you assemble it.

After the tail pieces are joined, cut slots for the control horns and CA in place.

Next up: slot the tailboom and glue into wing pylons.

-matt
MattN is offline Find More Posts by MattN
RCG Plus Member
Last edited by MattN; Jan 05, 2009 at 11:43 PM.
Reply With Quote
Old Jan 05, 2009, 11:43 PM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,779 Posts
Slot the Tailboom and Attach to Pylons

The vertical stabilizer of the Binary-900 is attached to the tailboom by cutting a 1" long slot into the end of the boom. The instructions call for drilling a hole through the boom, then using a file to cut the notch. Be very careful drilling the hole - it needs to be centered on the boom for the best finished strength. I started with a 1/32" drill in a Dremel Tool Drill Press, which made it relatively easy to get the hole centered in the boom. I then increased the drill size to 3/64, 1/16, then 5/64, which is a tad larger than the 1.8mm specified in the instructions. The hole serves as a strain relief, so a hair bigger than the width of the stab is OK.

I tried to use a Dremel tool with cutoff wheel to cut the slots. It worked OK to get the slots started, but it's really easy to make mistakes with that thing. After the slots were started, I used a small file to finish the job. This resulted in a nice, straight slot, and gave me time to test for a good fit.

The next step is to glue the tailboom to the wing mount pylon sleeves. Dry fit the boom to determine the positions of the sleeves, then rough up the boom with some sandpaper at the sleeve positions. To assemble, I mounted the pylons in the wing, flipped the wing upside down, inserted the boom, applied some 20min epoxy and slid the boom to the final position.

This step determines the relative alignment of the wing and tail, so it is very important to get everything square. I dry-fitted the vertical stabilizer into my new slot and used a square to get it perfectly vertical. This should get the tail/wing alignment just right. You also need to verify that the boom is square to the wing by measuring the distance from the wingtips to the end of the boom. In my case, I was just a hair off, so I nudged the boom to one side while the epoxy cured. There is tiny bit of slop in the sleeves, and was sufficient to fix my alignment problem.

Let it cure, and then we can move on to the next step: mount the boom into the fuselage.

-matt
MattN is offline Find More Posts by MattN
RCG Plus Member
Reply With Quote
Old Jan 06, 2009, 12:23 AM
DLG Fan
AZ_Astro's Avatar
Tempe, AZ
Joined Nov 2002
1,966 Posts
Do you have any idea what airfoil is used on the Binary 900? Any info in the instructions?
AZ_Astro is offline Find More Posts by AZ_Astro
Reply With Quote
Old Jan 06, 2009, 04:46 AM
Tarzanstyle English Sorry
AgoMago's Avatar
Cittadella(PD)(Italy)(Europe)(World)
Joined Nov 2004
517 Posts
Sorry Pivlrs
In the last photo:
It's only a dry fit or you epoxyed it that way?Hope so..
The vertical looks upside down to me
Ago
AgoMago is offline Find More Posts by AgoMago
Reply With Quote
Old Jan 06, 2009, 08:24 AM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,779 Posts
Quote:
Originally Posted by AZ_Astro
Do you have any idea what airfoil is used on the Binary 900? Any info in the instructions?
There isn't any mention of the airfoil. I was wondering the same thing myself

-matt
MattN is offline Find More Posts by MattN
RCG Plus Member
Reply With Quote
Old Jan 06, 2009, 08:26 AM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,779 Posts
Quote:
Originally Posted by AgoMago
Sorry Pivlrs
In the last photo:
It's only a dry fit or you epoxyed it that way?Hope so..
The vertical looks upside down to me
Ago
Dry fit. It's only there to square the boom. I didn't even notice it was upside down until I looked at the photo later...

-matt
MattN is offline Find More Posts by MattN
RCG Plus Member
Reply With Quote
Old Jan 06, 2009, 08:49 AM
Tarzanstyle English Sorry
AgoMago's Avatar
Cittadella(PD)(Italy)(Europe)(World)
Joined Nov 2004
517 Posts
Quote:
Originally Posted by pivlrs
Dry fit. It's only there to square the boom. I didn't even notice it was upside down until I looked at the photo later...

-matt
OK ok..
luky man only a dry fit!!!
ago
AgoMago is offline Find More Posts by AgoMago
Reply With Quote
Old Jan 06, 2009, 11:11 AM
Guz
Gutless wonder
Guz's Avatar
Tempe, AZ
Joined Dec 2005
3,136 Posts
I love your method of clamping down the blade to make the hing slots!!!! So simple, but elegant! (Wish I thought of it).
Guz is offline Find More Posts by Guz
Reply With Quote
Old Jan 06, 2009, 06:13 PM
Physics hate's my ideas
GreenAce92's Avatar
USA, NY, Dunkirk
Joined May 2007
3,913 Posts
question:
when you do your hinging do you sand any bevels? for the tailfeathers to move on?
GreenAce92 is offline Find More Posts by GreenAce92
Reply With Quote
Old Jan 06, 2009, 06:26 PM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,779 Posts
Quote:
Originally Posted by GreenAce92
question:
when you do your hinging do you sand any bevels? for the tailfeathers to move on?
I did not. I left them as they were and just left enough gap to allow for surface swing. Yeah, yeah, this isn't the most efficient way to go, but the gaps didn't need to be very big.

-matt
MattN is offline Find More Posts by MattN
RCG Plus Member
Reply With Quote
Old Jan 06, 2009, 07:16 PM
Physics hate's my ideas
GreenAce92's Avatar
USA, NY, Dunkirk
Joined May 2007
3,913 Posts
huh... ok cool thats pretty sweet...
i do the bevel/sanding but it looks as if it would create extra unwanted drag...
GreenAce92 is offline Find More Posts by GreenAce92
Reply With Quote
Old Jan 07, 2009, 09:20 AM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,779 Posts
Quote:
Originally Posted by AZ_Astro
Do you have any idea what airfoil is used on the Binary 900? Any info in the instructions?
I sent an email to Harry at Peak Hobby with this question. His reply was
"The airfoil of main wing is AG08 08 03"
So it looks like an Apogee-inspired design.

-matt
MattN is offline Find More Posts by MattN
RCG Plus Member
Reply With Quote
Old Jan 08, 2009, 02:51 PM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,779 Posts
Quote:
Originally Posted by LittleG
Just got mine today... Wings are made of foam core covered with very light fiberglass.
Hey, LittleG - have you started building yours yet?

The bit I'm pondering at the moment is how to route the tail control lines. Harry says they should be run outside the boom, but that means holes in the back of the fuse and through the bulkhead. Not too big a deal, but I'm trying to concoct a clever way to get all the holes accurately aligned to minimize drag on the lines.

With the holidays over, full-time work has invaded my schedule again. I'm only able to spend a little time on the build in the evenings. All that's left is to mount the tail and install the radio gear!

-matt
MattN is offline Find More Posts by MattN
RCG Plus Member
Reply With Quote
Old Jan 08, 2009, 07:23 PM
Registered User
LittleG's Avatar
Raleigh, NC
Joined Jan 2007
1,532 Posts
Haven't started building it yet. Like you, I've been busy with work as well.
Quote:
Originally Posted by pivlrs
Hey, LittleG - have you started building yours yet?

The bit I'm pondering at the moment is how to route the tail control lines. Harry says they should be run outside the boom, but that means holes in the back of the fuse and through the bulkhead. Not too big a deal, but I'm trying to concoct a clever way to get all the holes accurately aligned to minimize drag on the lines.

With the holidays over, full-time work has invaded my schedule again. I'm only able to spend a little time on the build in the evenings. All that's left is to mount the tail and install the radio gear!

-matt
LittleG is offline Find More Posts by LittleG
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log Peak-Hobby Binary-III DLG Building Thread Kai@UCSB Hand Launch 141 Aug 26, 2011 02:58 AM
Discussion Peak Hobby Binary II Wave Glider Hand Launch 1 Jan 10, 2009 06:48 PM
Cool My Visit to Peak Hobby - Home of the Binary-900 imack Hand Launch 10 Dec 17, 2008 07:02 PM
Hobby Lobby BD5 Build? saint152 Sport Planes 15 Aug 11, 2003 08:59 PM