HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Mar 03, 2006, 11:28 AM
Diggin the Foam
Tonasty's Avatar
Denver Arapahoe, Colorado, United States
Joined Jul 2004
1,292 Posts
You put us all to shame with that finishing job.
Tonasty is offline Find More Posts by Tonasty
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 03, 2006, 11:31 AM
Slope elope
Cziltang Brone's Avatar
United States, CA, El Cerrito
Joined Nov 2004
497 Posts
Let's see the secret nose art!
Cziltang Brone is offline Find More Posts by Cziltang Brone
Reply With Quote
Old Mar 03, 2006, 02:31 PM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
AAAAAAAaaaaighhhhTTT!!!

Here she is!!!!

Done, programmed, and just needs some lead for ballancing...
THUREN is offline Find More Posts by THUREN
Reply With Quote
Old Mar 03, 2006, 02:35 PM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Gear layout.... I used a "quick release" method for the hatch for WHEN the wing and fuse seperate. I'm going to find some brass 10-24 machine screws instead of the nylon..

edit: 55.8 ounces with no nose lead yet!

Blow wind BLOW!
THUREN is offline Find More Posts by THUREN
Last edited by THUREN; Mar 03, 2006 at 02:44 PM.
Reply With Quote
Old Mar 03, 2006, 03:44 PM
Registered User
Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
28,466 Posts
How much room under the battery do you have? My balancing slug
was 3oz, and I put it in front of the battery for maximum leverage.
I do intend to drill some of my lead out though because I've
currently got a half oz stick on weight 3/4 of the way
down the tailboom, so I'm sitting at the very rear end of the CG
range, and I intend to go back even further.

In the end my AUW will be less than 53oz.

ian
Daemon is online now Find More Posts by Daemon
RCG Plus Member
Old Mar 03, 2006, 04:15 PM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Quote:
Originally Posted by Daemon
How much room under the battery do you have? My balancing slug
was 3oz, and I put it in front of the battery for maximum leverage.
I do intend to drill some of my lead out though because I've
currently got a half oz stick on weight 3/4 of the way
down the tailboom, so I'm sitting at the very rear end of the CG
range, and I intend to go back even further.

In the end my AUW will be less than 53oz.

ian
I've got probably 3/8" under the battery? I'll measure for sure and put some pics up of the slug. I was going to ask you Ian where your CG was before I make the slug, cause I want good inverted/aerobatic performance, and I noticed you mentioned you thought it could go back farther. Are you running any reflex? I have about 1/4"(at root) of usable reflex dialed in since the foil looks like it could take advantage of it, and I like the top end and inverted performance it helps with. How does yours do in a dive?

I know, I could make the plate I put under the battery in pieces so I can easily pull weight...

Molten lead fumes coming soon...

Don
THUREN is offline Find More Posts by THUREN
Reply With Quote
Old Mar 03, 2006, 04:16 PM
jrerickson
jrerickson's Avatar
Valencia, CA
Joined Jan 2005
824 Posts
Ian,

Are you moving the cg back because the plane doesn't feel responsive enough? I would think that by the very nature of construction there is going to be a big yaw moment to overcome. You have a lot of weight out in the tips.

I'd be interested to find out the performance in moderate wind. No doubt it shreds in high wind. I'm always scratching my head when I hear of guys taping weight to their wingtips when they want a more stable plane to DS, but then again I come from the thermal side of things where you want the tips as light as possible.

John
jrerickson is offline Find More Posts by jrerickson
Reply With Quote
Old Mar 03, 2006, 06:02 PM
Registered User
relaxnfly's Avatar
Knoxville, TN, United States
Joined Jan 2004
266 Posts
THUREN
What rx are you using?
Michael
relaxnfly is offline Find More Posts by relaxnfly
Reply With Quote
Old Mar 03, 2006, 09:56 PM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Quote:
Originally Posted by relaxnfly
THUREN
What rx are you using?
Michael

Mikro Designs SPF-5

Don
THUREN is offline Find More Posts by THUREN
Reply With Quote
Old Mar 03, 2006, 10:00 PM
Mr. Innocent's Avatar
Oceanside CA
Joined Dec 2004
4,046 Posts
Does it have UV protection?
Mr. Innocent is offline Find More Posts by Mr. Innocent
Reply With Quote
Old Mar 03, 2006, 10:18 PM
Slope elope
Cziltang Brone's Avatar
United States, CA, El Cerrito
Joined Nov 2004
497 Posts
I got a chance to hold the THORN earlier today as we flew our modlies hoping for some serious wind. I couldn't believe how sturdy it is. The thing is built like a pool table.

I generally try to avoid multiple exclamation points but...THIS THING IS GONNA BE AWESOME!!!!!!!!!!!!!!!!!!!!!!111111oneone
Cziltang Brone is offline Find More Posts by Cziltang Brone
Reply With Quote
Old Mar 03, 2006, 11:49 PM
Registered User
Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
28,466 Posts
While I initially ran it with no camber and maybe even a little
reflex, I found that it flew like a brick when I did that. It felt mushy
in the turns. Added a little camber and it's much happier overall. Doesn't
hurt its energy retention at all and turns much better.
But I'm also finding that coming down out of big pumps it's still
wanting to pull up on its own. If I add more downtrim, then
I really have to hold the nose up to fly slow, so I think I can
continue to move the CG back. It also takes a lot of down elevator
to keep it flying inverted. It hasn't gotten pitchy yet
so I think I've got a goodly amount of room to play yet.

My CG is currently at the most rearward end of the suggest range.. 3 7/16th
and I suspect I'll end up at least an eighth to a quarter behind that.

As for span loading for DS. That's to try to reduce wing flex by more evenly
distributing the load on the wing. I wouldn't add any more
weight to the wings of the Thorn though.

ian
Daemon is online now Find More Posts by Daemon
RCG Plus Member
Old Mar 04, 2006, 02:54 AM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Quote:
Originally Posted by Daemon
While I initially ran it with no camber and maybe even a little
reflex, I found that it flew like a brick when I did that. It felt mushy
in the turns. Added a little camber and it's much happier overall. Doesn't
hurt its energy retention at all and turns much better.
But I'm also finding that coming down out of big pumps it's still
wanting to pull up on its own. If I add more downtrim, then
I really have to hold the nose up to fly slow, so I think I can
continue to move the CG back. It also takes a lot of down elevator
to keep it flying inverted. It hasn't gotten pitchy yet
so I think I've got a goodly amount of room to play yet.

My CG is currently at the most rearward end of the suggest range.. 3 7/16th
and I suspect I'll end up at least an eighth to a quarter behind that.

ian

Thanks a lot ian...

I have my CG at the same 3 7/16" right now, and if reflex made your feel mushy, i'm dialing it out. It does make sense that it wouldn't need it as gravity would do a great job with making it penetrate. I'm wondering where the CG's will end up but a near 60oz 60" plane is a little nerving to start moving it TOO far back, but if it need's it, it should help all around. From what you say it sounds like another 1/8"-1/4" woould really help dive and inverted.

Did you get snap-flaps out for a try yet?

I took it up to the hill today and crossed my fingers for some wind but it sat in the wet grass... Got a few sprinkles on the new wax job..

Don
THUREN is offline Find More Posts by THUREN
Reply With Quote
Old Mar 04, 2006, 03:08 AM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Quote:
Originally Posted by Daemon
How much room under the battery do you have? My balancing slug
was 3oz, and I put it in front of the battery for maximum leverage.
I do intend to drill some of my lead out though because I've
currently got a half oz stick on weight 3/4 of the way
down the tailboom, so I'm sitting at the very rear end of the CG
range, and I intend to go back even further.

In the end my AUW will be less than 53oz.

ian

Took 3.8oz to get to the rear of the CG range. Fit under the battery nice and is only about 1/4" longer than the battery, so all the weight is still up forward.

59.6OZ YEAH BABY!! dang......

I know it's hard to say what windspeed works for different sites, but ian, what do you think would be a SAFE windspeed to toss out for a maiden? I'm thinking a steady 20mph "should" keep it up fine at a good lift site... Our "Ruins" is somewhat similar to you Zion I think...

Don
THUREN is offline Find More Posts by THUREN
Reply With Quote
Old Mar 04, 2006, 03:45 AM
Registered User
Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
28,466 Posts
Ya, 20mph would be nice and safe for a maiden. It'll fly in less
but it depends on the slope. (Being at a lower elevation, it may fly in
a lot less for you) My wind dummy so far has been my 59oz 60 inch
LEG Reno Racer. If it flies decently then I know the Thorn will.
The Thorn's got a little higher wing loading, but of course a lot less drag.
The main thing is to get the speed up, keep it up, and don't over control it.

Regarding snap flaps.. I've been doing it manually by pulling
the throttle stick back just a tick in turns, and it helps. I still
need to switch radios and program it into my Stylus to get all the mixes I
want. (flaperons + snap flaps + left stick roll + flight mode with "thermal" trim
+ flap -> elevator compensation)
Snap flaps both ways, will probably help it fly inverted too.

ian
Daemon is online now Find More Posts by Daemon
RCG Plus Member
Last edited by Daemon; Mar 04, 2006 at 03:52 AM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Different Kind of Slow Stick, "Slow-G" build-n-fly Don Sims Parkflyers 49 Dec 20, 2006 01:32 AM
Fold-n-fly mike glass Foamies (Kits) 8 May 02, 2003 09:13 PM
WTB USAirCore fold n'fly F-16 Majortomski Aircraft - Fuel - Airplanes (FS/W) 0 Mar 06, 2002 09:07 PM
Want to scratch build a fun fly plane. Cay you recommend plans? WilliamSettle Sport Planes 4 Oct 04, 2001 11:29 PM
Why solder ESC's instead of plug-n-fly? J Cubed Power Systems 5 Jun 29, 2001 06:06 AM