Goliath engine and water

[The_Rocketeer]

I was tinkering with an amphibious vehicle, trying to get a wheeled-hydrofoil design to work, and suddenly realised that a Goliath engine mounted backwards and set to reverse-thrust  (mounted forwards looks wrong) would make a really awesome boat-propellor, possibly very useful to my design process. However I've since discovered that the Goliath is insanely buoyant - so much so that the engines barely dip into the water even with a sizeable Mk2 hull attached above.

Two thoughts immediately struck me:

1. Goliath engines are almost perfect for boats - huge buoyancy, excessive thrust, and exceptionally high ISP. The only real downside is their sheer size.
2. Goliath engines are also excellent for submarines - mount on vertical axis, naturally float, increase thrust to dive, trim thrust to maintain depth, etc.

Wondering if anybody else has experiences to share about using the Goliath (or other jet engines) in or on water?

[The_Rocketeer]

 

Cruising at 40m/s with a nearly full 10000 LF tank. 2 extra engines got me to 100m/s but I had stability issues.

[Rocket In My Pocket]

Hmm...maybe this is what the Goliath was for all along?