RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
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RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/8/2008 3:15:34 AM

David Jackson

Posts: 286
Joined: 4/15/2002
From: Nashville, TN, USA
Status: offline

I had one Ram 1000 (detuned to 20 lbs thrust) and a Ram 750 Plus. Both engine were in Jettech bypasses.

(in reply to YellowAircraft)

Post #: 51

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 3:54:23 PM

jkirkon

Posts: 373
Joined: 1/4/2003
From: Stratford, NJ, USA
Status: offline

What is everyone using for the stab pushrods? My stab servos are in the stock location, just forward of the rear main spar.
I can't seem to find anything off the shelf that is either long enough (approx 22" long), or that I am happy about.

I had read in another thread about a gentleman who aeropoxied a 4-40 rod inside a suitable sized c/f tube, then aeropoxied that assembly inside a larger diameter c/f tube. I believe he capped this off with some 4-40 metal ball links. GREAT idea, but am having a little troubel sourcing the proper sized tubes for the job.

Any thoughts, ideas????

Jeff

(in reply to David Jackson)

Post #: 52

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 4:09:21 PM

invertmast

Posts: 766
Joined: 12/11/2003
From: Bridgewater, VA, USA
Status: online

quote:

ORIGINAL: jkirkon

What is everyone using for the stab pushrods? My stab servos are in the stock location, just forward of the rear main spar.
I can't seem to find anything off the shelf that is either long enough (approx 22" long), or that I am happy about.

I had read in another thread about a gentleman who aeropoxied a 4-40 rod inside a suitable sized c/f tube, then aeropoxied that assembly inside a larger diameter c/f tube. I believe he capped this off with some 4-40 metal ball links. GREAT idea, but am having a little troubel sourcing the proper sized tubes for the job.

Any thoughts, ideas????

Jeff

Jeff,
the setup thats currently in mine, is 4-40 threaded rod into the dave brown fiberglass pushrod tubes. they are assembled as per the instructions, but the 4-40 rod goes about 1 1/2" into the pushrod before it makes the 90* bend. But the servo's are currently mounted at the aft vertical stabilizer bulkhead, but the system is very stiff. i believe i'm going to attempt to find a 4-40 rod thats long enough, so when i relocate the servo's to the stock location, the pushrod will be solid 4-40 rod the entire way, then have the dave brown pushrod over the 4-40 rod and aeropoxy or hysol holding the two together to stiffen everything up.

and then their is always this:
http://www.dreamworksrc.com/catalog/product_info.php?cPath=104&products_id=589

which i just found and like better.

_____________________________

Thomas W.
Avant FX, Trex 600N, YA F-18 Twin, Ziroli Panther..

(in reply to jkirkon)

Post #: 53

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 4:21:25 PM

jkirkon

Posts: 373
Joined: 1/4/2003
From: Stratford, NJ, USA
Status: offline

Thomas,

I have those same pushrods from Dreamworks in my Yellow F-16. They are awesome, but about 3/4" short for the F-18.

I suppose I could take 2 pieces of that 6mm pushrod, run a 4-40 rod through it, and sleeve/aeropoxy the whole thing with a c/f tube of appropriate diameter.

Jeff

(in reply to invertmast)

Post #: 54

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 4:56:22 PM

invertmast

Posts: 766
Joined: 12/11/2003
From: Bridgewater, VA, USA
Status: online

jeff,
3/4" man, that sounds about like the luck i would have. haha. i've used the 4-40 and davebrown setup alot previously on 40% airplanes w/o any issues, so thats probly the route i will end up going.

_____________________________

Thomas W.
Avant FX, Trex 600N, YA F-18 Twin, Ziroli Panther..

(in reply to jkirkon)

Post #: 55

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 6:29:24 PM

yeahbaby

Posts: 2506
Joined: 12/7/2001
From: FT Worth, TX, USA
Status: online

Jeff

on my previous hornet i used the DB carbon push rods with 4-40 end caps and threaded rods. to minimize the flex, I inserted an appropriately sized wooden dowel that ran the length between the end caps.

flex is non-existent under tension (up elevator) and nearly as good under compression ( down elevator)

you guys crack me up.

chillax bro's life is good. my primary concern when flying was loading up the airplane in a dive or turn.

(in reply to invertmast)

Post #: 56

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 7:10:23 PM

jkirkon

Posts: 373
Joined: 1/4/2003
From: Stratford, NJ, USA
Status: offline

I had thought about doing it that way, Buck. I was concerned about the flex under compression. May do so If I can't come up with something that makes me happpier.

Ideally, I would like to use the Dreamworks setup, and find some longer rods so that it fits my application.

I have it in my Yellow F-16 and it is absolutely rock solid.

Jeff

Attachments

Click to see fullsize image.

Click for fullsize

(in reply to yeahbaby)

Post #: 57

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 7:23:31 PM

invertmast

Posts: 766
Joined: 12/11/2003
From: Bridgewater, VA, USA
Status: online

quote:

ORIGINAL: yeahbaby

Jeff

on my previous hornet i used the DB carbon push rods with 4-40 end caps and threaded rods. to minimize the flex, I inserted an appropriately sized wooden dowel that ran the length between the end caps.

flex is non-existent under tension (up elevator) and nearly as good under compression ( down elevator)

you guys crack me up.

chillax bro's life is good. my primary concern when flying was loading up the airplane in a dive or turn.

thats what i'm probly going to go with. this is definately a big project and I for one, just want to eliminate as many of the weak spots as possible. I got one of my Ram 1000's for it yesterday, but still need another..

_____________________________

Thomas W.
Avant FX, Trex 600N, YA F-18 Twin, Ziroli Panther..

(in reply to yeahbaby)

Post #: 58

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 7:42:58 PM

yeahbaby

Posts: 2506
Joined: 12/7/2001
From: FT Worth, TX, USA
Status: online

I was willing to accept the minimal amount of flex under compression because i knew I wouldn't be requiring down elevator for my style of flying. i.e. I didnt' plan on doing extended periods of inverted flying. those fuel tanks weigh a ton!!!!

quote:

ORIGINAL: jkirkon

I had thought about doing it that way, Buck. I was concerned about the flex under compression. May do so If I can't come up with something that makes me happpier.

Ideally, I would like to use the Dreamworks setup, and find some longer rods so that it fits my application.

I have it in my Yellow F-16 and it is absolutely rock solid.

Jeff

(in reply to jkirkon)

Post #: 59

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 7:54:38 PM

YellowAircraft

Posts: 3126
Joined: 1/5/2002
From: San Diego, CA, USA
Status: offline

Buck,

Let's see some pics of YOUR project, bro! Help keep ME motivated....

_____________________________

Yellow Aircraft, JetCat Engines, Skymaster ARF+ and Turn Key Jets
www.cyctheatre.com

(in reply to yeahbaby)

Post #: 60

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 7:59:47 PM

yeahbaby

Posts: 2506
Joined: 12/7/2001
From: FT Worth, TX, USA
Status: online

LoL

all you gotta do is search GRbaker and look in his gallery.

I'm cheating and gave it to gary to frame up while I was in san diego last month. he's almost done and then the fun begins!!!

i'm totally psyched to get her back on the work bench and hope to have her done in time for Greater SW Jet Rally in Sept.

I know a thing or two about staying motivated on this project amigo. she'll wear you down!!! Ha

(in reply to YellowAircraft)

Post #: 61

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 9:29:30 PM

grbaker

Posts: 2442
Joined: 12/12/2001
From: La Porte (near Houston), TX, USA
Status: offline

Here are some pics of the YA twin Hornet that Buck's been workin' on.

Attachments

Click to see fullsize image.

Click for fullsize

Click to see fullsize image.

Click for fullsize

Click to see fullsize image.

Click for fullsize

_____________________________

Gary Baker

(in reply to yeahbaby)

Post #: 62

RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT F... - 3/9/2008 9:48:09 PM

invertmast

Posts: 766
Joined: 12/11/2003
From: Bridgewater, VA, USA
Status: online

yall are talking about motivation needed. i'll have to upload pics of what i've been doing for 3 days. stripping paint off the entire airframe so you can save a few pounds of weight by HAND is a major pain... the only thing thats keeping me motivated is the pics of everyone else's projects

_____________________________

Thomas W.
Avant FX, Trex 600N, YA F-18 Twin, Ziroli Panther..

(in reply to grbaker)

Post #: 63