HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Mar 03, 2014, 06:08 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
Well I worked on the internal control horn for the rudders today
and I think it'll work

I've cut out four hinges from some fiberglass sheeting I made a while back; they need to be drilled and a nylon bushing added where the steal music wire goes through.

I need to run a test w/ the radio and then build the rudder; I'll see if I can make a short video tomorrow w/ it working.

I think I'm done for the day,

Bruce
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 04, 2014, 11:50 AM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
I continue on the tail section, the rudder actuators I went ahead and made the second one and doubled the thickness to the brass where it connects to the clevis
on the prototype.

Before I did that I ran a test w/ the radio TX / RX and it works very well OF course there's some tweeking that's needs to be done.

I'm still not working like I normally would focusing is a bit harder; I'm not sick just moving slow.
I'm now putting together the rudder and the hinges.

If I can I'll make a short video and post it later on today.

Bruce
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 04, 2014, 05:14 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
Well I didn't get quite as far as I had hoped today life things kept me busy
Both of my tower orders have come in and now I well supplied once again.

I was looking at the drawings and Gene only put 5 ribs in the rudders?
I went to one of my reference photos and there are 7 ribs it's not as if I were covering w/ fabric but I put in 7 ribs.

There notched in forward and aft as per his drawing; this I like very strong,
he has many different thickness pieces going on here and some 1/8" scabbed on to 1/4" I'm not sure if he did this to make it strong or if he was thinking that's what modelers would be able to get?

I used 3/8" stock; and there are a few places where I'll add some gussets.
the blocks that are the counter balances have to be tapered from 5/8" to 1/2" before I glue them to the rudder, the white nylon tubing will be covered over.

Next I need to drill the hole for the music wire to run through the top block of the rudder and bend the wire, then create an notch that the bent wire will seat into.

Well there's always tomorrow,

Bruce
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 05, 2014, 08:34 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
Got some more details added on this evening; added structure / gussets and lightning holes as well as rough shaping the rudder.

I added some blocks for the carbon fiber tubes to seat in when in place as well as blocks for the hinges, I still need one on the top hinge.

There's quite a bit of small things that need attention but it's starting to shape up; in the morning I push to get the actuator set and running w/ the RX.

There's one thing I've been noticing and that's the center section still needs more structure; when you put pressure on the tail section it moves the far side of the wing very easy, I'll have to add a tube in there and maybe some more stringers?

Bruce
splinterz25 is offline Find More Posts by splinterz25
Last edited by splinterz25; Mar 05, 2014 at 08:45 PM.
Reply With Quote
Old Mar 06, 2014, 10:34 AM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
Okay here's the video of the rudder actuator test run; I would like to get
more range of motion and think I can w/ some more sanding to remove more on the LE radius, but check it out she's working.

BV-138 RUDDER TEST RUN (1 min 33 sec)
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 06, 2014, 11:01 AM
71% of the world is runway . .
Bart83's Avatar
Nederland, ZH, Oostvoorne
Joined Jun 2009
1,791 Posts
Very cool Bruce ! this wors very nice and scale.

Cheersm

Bart
Bart83 is offline Find More Posts by Bart83
Reply With Quote
Old Mar 06, 2014, 11:52 AM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
Thank you Bart I think it does also but would like a bit more throw if possible.

Then I still have side two, BUT I made two sets of parts while building the first side and I know what I'm doing now so the next side should go much faster.

I'm also tracing all parts to light ply for templates; I'm out of Masonite.

Bruce
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 07, 2014, 01:36 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
I made some changes and a new video.

BV-138 RUDDER TEST RUN TWO (1 min 11 sec)
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 07, 2014, 01:41 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
Alright before moving on I wanted to get the rudder setup a bit better; I first removed some of the nylon servo wheel and ran a test, this worked much better.

The clevises were hitting on the inside; the other thing I did was, I didn't think the nylon wheel would hold up very well.

So I had some large composite wheels / horns that I thought would be much better suited for this application;But they had to be modified first.

The other things I did was enlarged the hole where the push rods pass through the TE of the virt. fin, then reinforced the sides w/ carbon fiber threads/ tape.

Also I added a piece under the servo to help reinforce the rib the servos mounted into.

In the actuator box I made more clearance for the clevises and added there retaining clips.

Nothing is glued in solid yet; but I made a little better video, I still need a lot of work on these videos yet.

CHECK IT.
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 07, 2014, 05:13 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
Now this afternoon I started on the part where the tail breaks apart.
There will be an ALUM. clip that will go at the bottom locking in a groove like the boom did.

There will be a bolt running through the ALUM. and 9 ply that has been glued in to the former and will thread into a T-nut that's sandwich 1/4" ply, that will be notched to the stringers and the bolt will pull all of this together tight.

This only holds the tail from coming off; the 2 long carbon fiber tubes are the strength of this hole system, that's why I made sure the were very tight and seat snugly.

I post photos when I have it a bit farther along.

Bruce
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 07, 2014, 05:24 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
I'm trying to get the screen to show here?
BV-138 RUDDER TEST RUN TWO (1 min 11 sec)
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 08, 2014, 01:19 AM
71% of the world is runway . .
Bart83's Avatar
Nederland, ZH, Oostvoorne
Joined Jun 2009
1,791 Posts
works better Bruce , way more throw !

Cheers,

Bart
Bart83 is offline Find More Posts by Bart83
Reply With Quote
Old Mar 08, 2014, 08:07 AM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
YES ...Thank you Bart... also there's no bind and w/ the composite horn / wheel I feel
it's much more durable.
Now for the removable tail section, before moving on to building boom two.

Bruce
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Old Mar 09, 2014, 06:34 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,322 Posts
Alright today after running to get some supplies I was able to get the removable tail completed on one boom, the other side will be the same way w/ the stab. / elv. connected permanently in between.

I picked up 12- 4" clamps a countersink set and a laser level; I'm not going to try and explain what I did just look and if you have any questions feel free to ask.

Check it out,

Bruce
splinterz25 is offline Find More Posts by splinterz25
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Blohm und Voss BV-141 edbu1 Scale ARF/RTF 0 Oct 26, 2013 06:07 PM
Discussion Blohm & Voss BV 138 'Sea Dragon' Foam Builders Kit Gemma Jane Scale Kit/Scratch Built 60 Oct 29, 2011 06:32 PM
Build Log Blohm and Voss BV P.215 EricClark Electric Warbirds 18 Dec 09, 2007 08:15 PM
Blohm & Voss BV-141 mu2freighter Scale Kit/Scratch Built 14 Nov 10, 2003 10:29 AM