SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Jan 11, 2010, 04:05 AM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
465 Posts
Build Log
Outboard Kneeler Hydro - Hedlund 1/4 Scale

I have a build thread going in the scale boats section for my 1/8 scale version, but I figured this was a better spot for the 1/4 scale hydro. This is my first full R/C build. I will be running a Graupner GTX 650 on it to start with.

I started cutting this weekend, getting the main coaming girders cut and shaped, and then joining them with the transom and crossmembers. I've never built a model this large! This should be fun!
Chinewalker is offline Find More Posts by Chinewalker
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 11, 2010, 07:18 AM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
465 Posts
Framing coming together...

I got all the main frames in last night...
Chinewalker is offline Find More Posts by Chinewalker
Reply With Quote
Old Jan 11, 2010, 12:27 PM
Grumpa Tom
Kmot's Avatar
United States, CA, Los Angeles
Joined Sep 2003
23,576 Posts
Nice!
Kmot is offline Find More Posts by Kmot
Reply With Quote
Old Jan 11, 2010, 06:32 PM
Studying Engineer
MarcRacer18's Avatar
United States, CA, Santa Barbara
Joined Jun 2009
685 Posts
Nice strart!
MarcRacer18 is offline Find More Posts by MarcRacer18
Reply With Quote
Old Jan 13, 2010, 10:33 AM
**NOT GUILTY**
Capt.Crash's Avatar
Millbrook, Alabama
Joined Jun 2004
6,444 Posts
Ah...nice simple clean lines...maybe I should have done something like this.

Looks good so far.
Capt.Crash is offline Find More Posts by Capt.Crash
Reply With Quote
Old Jan 13, 2010, 02:15 PM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
465 Posts
1:1 Boat

Awhile back someone asked me what the real boat looked like underway. I found a pic of my Dad driving it with my 1952 Mercury KG-7H Hurricane on it. This was the first motor I ran on the boat when I got it. It did about 45-48 mph with that motor. It wasn't a bad set-up but the boat really came alive when I put a 1980 Mercury 25SS on it and it would nudge 60mph. The boat really likes to fly and doesn't pack enough air under it to float it until it hits the mid 50s. It's kinda like riding an elevator - your gut gets that sinking feeling as the boat just lifts up about 6-inches off the water and just hangs.
Chinewalker is offline Find More Posts by Chinewalker
Reply With Quote
Old Jan 14, 2010, 12:59 AM
Registered User
Amp Abuser's Avatar
Joined Dec 2007
1,390 Posts
Where was the CG? Looks like it was back quite a bit base on the picture.
Amp Abuser is online now Find More Posts by Amp Abuser
Reply With Quote
Old Jan 14, 2010, 04:31 AM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
465 Posts
The CG in an outboard hydro is considerably different than that of an inboard hydro. With the driver and motor the center is well back of the sponsons.
Chinewalker is offline Find More Posts by Chinewalker
Reply With Quote
Old Jan 14, 2010, 11:24 AM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,164 Posts
Looks good . Great subject for a model.
Are you going to fill the spaces between the bulkheads with foam before you put the skin on? Certainly makes for a stronger hull & it won't sink if you have a serious crash.
Cheers.
Paul.
785boats is online now Find More Posts by 785boats
Reply With Quote
Old Jan 14, 2010, 11:54 AM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
465 Posts
Would I use a pour-in foam? I have some 8 lb. density 2-part left over from a 1:1 project.
Chinewalker is offline Find More Posts by Chinewalker
Reply With Quote
Old Jan 14, 2010, 03:33 PM
Registered User
mxz70017's Avatar
Joined May 2006
911 Posts
chinewalker

I would not use a commercial grade 2 part foam.They make one for models.Its a low E ok.The stuff you use for a real boat or home.Will expand way to much per volume an will blow that frame apart.What most do an I would do on that balsa frame.Is use a closed cell Ridgid foam board. An cut an shape It. To fit between the bulkheads.Make sure It Is a closed cell foam!!!If not the open cell absorbes water an that's not good...

Hey also looking good...See you put In some cross members to stiffen It up.
mxz70017 is offline Find More Posts by mxz70017
Last edited by mxz70017; Jan 14, 2010 at 06:44 PM.
Reply With Quote
Old Jan 14, 2010, 03:46 PM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
465 Posts
Thanks! I have some closed cell foam board I can use....
Chinewalker is offline Find More Posts by Chinewalker
Reply With Quote
Old Jan 15, 2010, 08:15 AM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
465 Posts
Thinking out loud, and having Googled around a bit on building RC outboard hydros, I am now wondering if I should be building this in wood over foam construction? I really don't have a whole lot of time or money into it so far, so it wouldn't be hard to backtrack and start from scratch. Coming from a 1:1 boating background, my first thought was to build it plank over frame like a real boat, but now I'm having second thoughts.... Any input?

Thanks!
- Scott
Chinewalker is offline Find More Posts by Chinewalker
Reply With Quote
Old Jan 15, 2010, 11:46 AM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,164 Posts
No need to change what you've done so far.
Just put the bottom & side skins on, as you were going to do. Then cut & fit the blocks of foam to each section & glue them in, leaving them a bit proud of the deck bulkheads & frames. Then carve & sand to shape. Then glue on the deck skin. That's the way I do it anyway.
All the best.
Paul.
785boats is online now Find More Posts by 785boats
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log Hedlund Class B Outboard Hydroplane Chinewalker Scale Boats 35 Jan 20, 2014 10:59 PM
Sold Have a Mugen MBX6 KIT 4 Trade 4 1.9 Scale Truck rcdirtslinger Cars - Trucks and Parts (FS/W) 1 Jan 04, 2010 05:16 AM
Sold 1/4 scale Duncan Hutson Hanriot H.D.1 kit ryan_m Aircraft - Fuel - Airplanes (FS/W) 0 Dec 14, 2009 09:07 AM
Discussion 1/12th scale fiberglass t-plus hydro for FE. maverick pro Racing Boats - Electric 28 Nov 13, 2009 08:49 AM
For Sale DPI 1/4 Scale Seabold Tunnel Hull Brand New! With K&B 13.3cc outboard! FrankW Boats (FS/W) 6 Dec 06, 2008 08:50 PM