Model Boat Mayhem - Forum

Please login or register.

Login with username, password and session length.
Pages: [1]   Go Down

Author Topic: Aeronaut Springer - couple of questions  (Read 1032 times)

clockworks

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 135
  • Model Boat Mayhem is Great!
  • Location: Cornwall
Aeronaut Springer - couple of questions
« on: August 18, 2019, 06:50:22 PM »

My first build - an Aeronaut springer kit fitted with brushless motor on two 5000maH 2s LiPos in parallel. Skinned in epoxy and cloth, so it's not exactly a lightweight, but I still needed to add a kilo of lead to get it close to the waterline.


It handles quite well when going forwards - as long as I keep the speed down. Turns nicely too, unless I try going in reverse, when the rudder does absolutely nothing! This isn't a major problem when I'm just pottering around on the lake, but it might make lining up to rescue another boat a bit tricky.


Is this lack of rudder authority in reverse an inherent problem with springers?


Just how low at the stern do I need to ballast it to stop it submarining at higher speeds?
Logged

Gardener

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 172
  • Ribble Model Boat Club
  • Location: Chorley Lancashire
    • The Wildlife Friendly Gardener
Re: Aeronaut Springer - couple of questions
« Reply #1 on: August 18, 2019, 07:20:38 PM »

stopped my cratch built Springer from diving by pushing a barge, it handles much better with the barge than light
Logged

Netleyned

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 8,988
  • Location: Meridian Line, Mouth of the Humber
    • cleethorpes mba
Re: Aeronaut Springer - couple of questions
« Reply #2 on: August 18, 2019, 07:25:25 PM »

I ballasted mine so the waterline was level, then
moved the ballast aft to give the bows about an
Inch and a half between waterline and water
I fitted a Kort nozzle(steerable) on mine as the
Hull has no longitudinal stability, i.e. no keel so
the rudder has little effect. With a Kort nozzle
my Springer will turn in it's own length ahead
or astern.
Ned
Logged
Smooth seas never made skilful sailors
Up Spirits  Stand fast the Holy Ghost.
http://www.cleethorpesmba.co.uk/

clockworks

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 135
  • Model Boat Mayhem is Great!
  • Location: Cornwall
Re: Aeronaut Springer - couple of questions
« Reply #3 on: August 19, 2019, 09:36:51 AM »

Sounds like I need to shift a lot of lead towards the rear.


Steerable Kort nozzle - I guess I could do that by extending the propshaft a little so that the prop sits on the rudder shaft axis.
Logged
Pages: [1]   Go Up