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Author Topic: Yet another new build Springer!  (Read 30518 times)

Arrow5

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Re: Yet another new build Springer!
« Reply #100 on: August 21, 2014, 02:20:16 PM »
with video , of course. <*<
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KillerDave

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Re: Yet another new build Springer!
« Reply #101 on: August 21, 2014, 03:17:49 PM »
I do like videoing stuff!  :D
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KillerDave

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Re: Yet another new build Springer!
« Reply #102 on: August 21, 2014, 10:25:16 PM »
Here you go...


Now then... when you guys say the Springers like to submarine, you're not kidding!


The speed is much better but man! get to full speed and the tail lifts up and the front digs in! on the plus side, the washports work!  :-))


https://www.youtube.com/watch?v=xS9CGwXtq1k&feature=youtu.be

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radiojoe

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Re: Yet another new build Springer!
« Reply #103 on: August 21, 2014, 11:06:52 PM »
Well Dave you got to be pleased with that, good performance, but I can now see what the guys are talking about in the submarine tendencies but then she should push OK which I guess is what they are designed to do, nice one mate  :-))
Joe.
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Arrow5

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Re: Yet another new build Springer!
« Reply #104 on: August 22, 2014, 08:33:19 AM »
Nice going, try moving the batteries back a bit if you can. If not some ballast at the stern to give a slight bow up when at rest.  Brass prop for increased reverse performance.   Don`t allow the ducks to chase you ...you can get reported for allowing them ;) 
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KillerDave

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Re: Yet another new build Springer!
« Reply #105 on: August 22, 2014, 10:20:44 AM »
Please correct me if I'm wrong but...
 
On the plans it showed several options for the propshaft angle, I went for the one that alowed me to fit the gearbox also on the drawing....
 
This angle would give a downward thrust line coupled with the resistance of the bow wave and lifting the stern and so pushing the bow under!
 
It was quite alarming though!
 
I don't think I have much chance to move the batteries back but I will look at it....
 
Thanks chaps!  :-))
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Arrow5

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Re: Yet another new build Springer!
« Reply #106 on: August 22, 2014, 01:42:59 PM »
Ballast can be "working"  i.e. brass bollards, tow hook, resin inflatable etc., as far back as possible.  Lots of non-diving devices have been tried, underwater wing, bulbous nose (added buoyancy) etc.  Prop shaft angle too dodgy to alter at this stage. There has been a trio of submarines that were a result of this tendency to dive.   Toesup`s Red Oktober, my HMS Sprub and the Yellow Submarine by ...um ? {:-{  sorry forgot who :((
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Netleyned

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Re: Yet another new build Springer!
« Reply #107 on: August 22, 2014, 04:10:46 PM »
Thats a good looking Springer.
People foget that a Springer is a model of a Truckable Towboat
                                                                                         
They only do 40Knts on the back of a truck >>:-(

They jus push barges at a slow rate of knots

Ned
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Calimero

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Re: Yet another new build Springer!
« Reply #108 on: August 22, 2014, 05:10:12 PM »
I assume that the "inverted wing" profile doesn't help. Might actually generate some downforce ?


I've found a way to get mine to go bow-up at full throttle:
http://youtu.be/YsZXOuTRnmw?t=2m15s

Just tow a 300kg heavy-lift ship.  {-)


Here's how mine is trimmed:


At full throttle it still tends to dive. There's water coming on the deck but it is still safe to sail that way (although it looks weird).
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KillerDave

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Re: Yet another new build Springer!
« Reply #109 on: August 22, 2014, 06:57:47 PM »
Quote from: Netleyned on August 22, 2014, 04:10:46 PM
Thats a good looking Springer.
People foget that a Springer is a model of a Truckable Towboat
                                                                                         
They only do 40Knts on the back of a truck >>:-(

They jus push barges at a slow rate of knots

Ned


Thanks Ned, it's not completely finished just yet... I'd like to get some more detail and sort the rubbish paint too...
So truck measure their speed in Knots?  ok2


I am a huge speed freak and this is by far the slowest thing I've ever built! my current fastest is hitting 100+mph! this Springer could be my backup rescue boat for when my fast one ends up on its back!  {-)
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KillerDave

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Re: Yet another new build Springer!
« Reply #110 on: August 22, 2014, 07:08:19 PM »
Quote from: Calimero on August 22, 2014, 05:10:12 PM
I assume that the "inverted wing" profile doesn't help. Might actually generate some downforce ?


I've found a way to get mine to go bow-up at full throttle:
http://youtu.be/YsZXOuTRnmw?t=2m15s

Just tow a 300kg heavy-lift ship.  {-)


Here's how mine is trimmed:


At full throttle it still tends to dive. There's water coming on the deck but it is still safe to sail that way (although it looks weird).


I thought that about the shape too and was thinking of building a traditional bow under the waterline???


I also have a bulwark all round and I deliberately pointed the section between the knees forward to help but it still floods the deck, the extra weight of the water drags it in deeper and I've been lucky not to send it down!!!


I've now put some weight right in the back so I'll give it a go and see how it looks....
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Calimero

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Re: Yet another new build Springer!
« Reply #111 on: August 22, 2014, 09:27:04 PM »


Springers are good recovery boats even without such a rig. The flat bow is very convenient.
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KillerDave

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Re: Yet another new build Springer!
« Reply #112 on: August 26, 2014, 07:54:16 AM »
Thanks Calimero! I will keep it in mind for when I brave the fast one again...
 
Well... This weekend, I did shuffle about the ballast and now it's more bow up...
 
IF the weather is ok this evening, I will pop to the lake for another test....
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KillerDave

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Re: Yet another new build Springer!
« Reply #113 on: August 27, 2014, 06:42:52 AM »
I'm wondering....


What are people doing on their drive angles??? Is my downward thrust line pushing the back up and the bow into the water???





Anyway, I moved 320g of weight from the bow and put it as far back as I could plus added another 160g and this is the result...



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KillerDave

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Re: Yet another new build Springer!
« Reply #114 on: August 27, 2014, 07:56:36 AM »
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Arrow5

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Re: Yet another new build Springer!
« Reply #115 on: August 27, 2014, 11:33:48 AM »
Looks like you still need some more weight aft. The prop shaft angle is a contributing factor built it really is the hull shape that causes the dive.    A skid/prop saver coming out of the skeg could be brass or heavy gauge piano-wire , the rudder could be heavy body filler round a brass centre for more weight. For better turning add a T or triangle vertical strip down the trailing edge of the rudder, looks technical even if it doesn't need it !  Video doesn't need music , unless you have a noisy U/J %)
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KillerDave

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Re: Yet another new build Springer!
« Reply #116 on: August 27, 2014, 01:00:14 PM »
Thanks for your comments arrow5, I take them on board and will add more weight....
 
On a slight tangent, and I know this might upset things but...
 
Has anyone tried fitting a traditional bow under the springer?
I have a feeling about it....???
 
As far as the rudder goes, I like how it turns now.... it just has little astern performance...
I will get a better prop for it soon, I just want to address the diving...
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Arrow5

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Re: Yet another new build Springer!
« Reply #117 on: August 27, 2014, 01:25:29 PM »
Yes someone did de-springer a springer by putting a sharp front on it...er pointless exercise if you ask me , it wont be a springer.  Remember what they are .. truckable pushboats. The variations of the topsides have spawned all type as you know but most people hesitate at going the pointy end bit.  Just build a simple conventional shaped tug which a lot of people do having been introduced to model boating by the simplicity of the blunt bow.  They weren't designed for efficiency  :((   BTW I was the idiot that tried the bulbous bow on springer, designated by some as "Arrow`s Knob" {-) .   Toesup had front foils under the bow, worse than the bulb O0   Your raised bulwark is a better idea, I`ve got a couple with  a strip of 90* angle sticking out front.
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KillerDave

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Re: Yet another new build Springer!
« Reply #118 on: August 27, 2014, 06:38:36 PM »
I wasn't thinking of a "pointy" bow, Just the part under the water... the part that pushes against the water..


I've been playing with boats for 25 years or more but I built a Springer because it looked fun, plus my daughter wanted a boat and this is a great start for her.


I think I saw your design. I say!  {-)


I was also thinking of putting a clear screen on top of my forward bulwark???


BTW, I actually built that section leaning forward to stop the bow wave.... not quite enough though....  %)
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Arrow5

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Re: Yet another new build Springer!
« Reply #119 on: August 27, 2014, 07:40:23 PM »
The "part under the water"   i.e. most of the hull ?  {-)   The answer is weight distribution.  Waterline at rest should be an inch lower at stern.  The V under the bow would be an interesting  study, try a block of blue (or pink) foam and video the result.
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KillerDave

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Re: Yet another new build Springer!
« Reply #120 on: August 27, 2014, 08:03:28 PM »
Quote from: arrow5 on August 27, 2014, 07:40:23 PM
The "part under the water"   i.e. most of the hull ?  {-)   The answer is weight distribution.  Waterline at rest should be an inch lower at stern.  The V under the bow would be an interesting  study, try a block of blue (or pink) foam and video the result.


I will move my batteries and go from there.


My thought about the "V" bow was to see if it pushed the water sideways instead of forward and up....
I think I'll try a simple mock-up....???


Hang on.... Are you setting me up??? Lol...  ok2
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Arrow5

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Re: Yet another new build Springer!
« Reply #121 on: August 27, 2014, 08:44:19 PM »
Dave`s wedgie  ??? %) ;D
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KillerDave

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Re: Yet another new build Springer!
« Reply #122 on: August 27, 2014, 08:54:38 PM »
Quote from: arrow5 on August 27, 2014, 08:44:19 PM
Dave`s wedgie  ??? %) ;D


Ha! That did make me laugh!  {-)
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dave parker

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Re: Yet another new build Springer!
« Reply #123 on: August 03, 2016, 08:10:53 PM »
Hi KillerDave

A springer newbie here

Apologies for bringing upan old thread,i just wonderedif you could spare a little time to tell me your routine and technique for cutting your wood,in particular plywood for hull and the major parts?  :-)

Cheers
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dave parker

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Re: Yet another new build Springer!
« Reply #124 on: August 03, 2016, 08:12:32 PM »
Just realised Dave hasnt been on here since 2014

Can anyone else giveme their techniques i mentioned??

 :-))
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