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Swamp Rat builders

Peter millers

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kc21/08/2013 18:28:58
6058 forum posts
169 photos

swamprat3.jpg

This is the Liteply battery tray on my version which reinforces the nose as well. Note holes for plugs to pass through and slots for Velcro strap in two different positions so the Lipo can be placed further back if needed.

kc21/08/2013 18:40:16
6058 forum posts
169 photos

swamprat1.jpg

Motor & Lipo placed in postion just to see how everything fits.........the ESC is placed underneath out of the way.

A simple hatch on top should produce a sleeker appearance but this is just a practical plane not built for looks.

Note that I joined the fuselage sheet at the front with a simple butt joint rather than at the tail with a scarfed joint as designed. I figured it would be strong enough as it's lapped by the 1/32 ply ( as designed for glow it would also be lapped by a 3/16 trebler as well as the ply if joined here)

swamprat2.jpg

This is the underside view. A hatch underneath will cover the ESC & have an airscoop for cooling. The Lipo access is on top for safety even if it weakens the construction having a hatch top & bottom.

Gary Vinten 121/08/2013 19:40:38
522 forum posts
326 photos
1 articles

Hi KC

It will be interesting looks like you have gone for 300w on 3s. Hmmmmmmm

Just looking at the location of the lipo, my only suggestion would be to remove the studs (cut them down) or put in a safety wall to cover them. The reason, if you have a disaster the lipo could get damaged by the studs .

(as me how I know ) it happened to me on 6s a huge smoke ball and flames and nothing left very very frightening

​good luck with the build I will be interested to know the auw!!!

 

 

 

 

Edited By Gary Vinten 1 on 21/08/2013 19:42:14

kc22/08/2013 15:00:33
6058 forum posts
169 photos
Gary, you are absolutely right .....but of course this was just a lash up to show how it all fits and the bolts were just left oversize at the moment! Interesting to hear that it did cause a fire though....a soft balsa bulkhead seems a good idea to locate the Lipo & save damage.
It is not clear whether as designed the part of the fin extends right down between elevators--- the grain shown suggests not, but I will extend it to meet the tailskid plate to make it a bit more sturdy to resist hanger rash etc. A cutout for elevator joiner will be needed.

I have to say Peter's wing construction method is easy & much quicker than 2 panels. Almost as quick to make 1 long panel as to make half a wing! So it's almost twice as quick. Makes me wonder whether any wing needing dihedral would be quicker to build in one piece and sawn in half and rejoined with dihedral braces!
Peter Miller22/08/2013 18:23:12
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10271 forum posts
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The fin stops on top of the tailplane and is supported by the triangular stock shown. The rudder goes right down to the bottom of the fuselage. Putting the fin through the tailplane will weaken the tailplane and that is NOT a good idea..

I suppose you could build wings in one piece and then cut them and jpoin them. I do not have a long enough building board for wings of more than 48"

kc23/08/2013 12:24:27
6058 forum posts
169 photos
Actually Peter I was not suggesting cutting into the tailplane! I noticed that 1 inch of the fin can go down between the elevator halves without cutting into the tailplane. so that is what I intend to do. I have pulled in the fuselage to leave just a 1/4 inch gap ( instead of about 3/16 on the plan )to allow the rearmost 1 inch of the fin to just fit & go right down to the tailskid plate.

Cutting into a tailplane is a very bad idea as Peter says, in fact just scoring the tailplane when trimming the film can cause tailplane failure - a fellow club member had a Wot4 tailplane shear off on one side in flight due to this. Fortunately magnificent flying by his instructor saved the plane and allowed inspection which revealed the probable cause of the fault was a light scoring of the balsa where the film had been trimmed.

Peter Miller23/08/2013 18:34:57
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10271 forum posts
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I simply used a bit of tapered wood between the sides at the rear. I suppose you could run the rear of the fin down to the bottom. On the drawing it shows that the rear of the fuselage is in fact 1/4".

Note that on my original drawing the triangular wood each side of the fin only covers the width of the tailplane.

Gary Vinten 126/09/2013 19:00:12
522 forum posts
326 photos
1 articles

Hi KC

How is the swamp rat going any updates smiley

kc27/09/2013 13:55:55
6058 forum posts
169 photos
Just about finished covering it 5 minutes ago......
...lots of fitting out now, glueing hinges, pinning them, horns, clevises, motor, .....all the things that muck up a good covering job!

What news on the Patriot plans being published Gary?
Gary Vinten 127/09/2013 17:23:15
522 forum posts
326 photos
1 articles

Hi KC

Patriot plans ah!! Not a lot on that front but will try to do something during the winter .

Do you have any photos of the rat covered ?wink

kc28/09/2013 00:47:40
6058 forum posts
169 photos
No photos yet, but soon.....

All up weight with 3S2200 Lipo is just under 3 pounds which is quite good. CG should be OK without any lead. Nothing special was done to keep the weight down, just good balsa selection, wiping away glue excess ( Evostik Resin W was used mostly )and Solarfilm covering. Servos in the fuselage were moved forward a bit ( no need to leave room for tank with electric )and 2 HS 55 servos used for ailerons. One thing which might have saved a bit of weight is use of glue film instead of contact adhesive on the ply doubler.
kc28/09/2013 20:01:28
6058 forum posts
169 photos
Has anybody else built the Swamp Rat except Peter, Gary and myself?
Formtex194730/09/2013 15:25:17
44 forum posts
14 photos

Hey KC, Yes I am curretly building The swap rat and am almost finished the fuselage now.
The wing is done have to say enjoyed the cowl a lot especially as she's going to be the IC version so lots of cut outs etc. When she begins to get assembled and looks Ok will post a picture. Hope she flys as well as she looks so far.

Gary Vinten 130/09/2013 22:24:08
522 forum posts
326 photos
1 articles

Hi formtex

You will not be disappointed in the performance they fly great yes

Peter Miller01/10/2013 08:49:29
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10271 forum posts
1226 photos
10 articles

I use Swamp Rat as my windy weather model. If it is windy I know I can fly her even when other models are struggling.

Gary Vinten 101/10/2013 11:07:56
522 forum posts
326 photos
1 articles

Hi Peter

Yes you are right i can fly mine in quite windy conditions along with the Patriot smiley

kc01/10/2013 11:43:03
6058 forum posts
169 photos
This is such a simple build there must be more than just 4 people who have built this! If it flys as well as you both say, and I am sure it does, then it should be a very popular model.....so I nominated it for the 2014 Mass Build
Gary Vinten 103/10/2013 20:30:14
522 forum posts
326 photos
1 articles

I have nominated the swamp rat for the mass build as well

If it gets to a build I will do the electric convertion on this thread for others to follow wink

Gary Vinten 103/10/2013 20:34:31
522 forum posts
326 photos
1 articles

Hi KC

How is the build coming on is the covering done yet

Gary Vinten 103/10/2013 20:35:46
522 forum posts
326 photos
1 articles

Hey formtex

How is the build  any photos yes

 

Edited By Gary Vinten 1 on 03/10/2013 20:36:40

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