KB59
New Member
Hi
I am new to posting on this site, but have been reading posts on here for quite a while now and must congratulate the members on their willing and open discussion. It is refreshing to see in this era a group of people willing to help other enthusiast for the sake of helping.
A little about myself and my project.
My design is a tandem open cockpit 2 seat amphibian with a 100hp/68 inch prop as a pusher with a MTOW of 640kg and designed for saltwater application with a round a 5 year first flight build time from now.
If you think of a Super Drifter with the fuselage boom replaced with a floating hull as a general layout. 14.884 m2 USA35B Flapped Wing, VNE 85knots.
One area I am a little stuck, I expect the hull will have some in flight lift and with most of the hulls possible lifting area well forward of the wing CofG. I need to get a handle on how this may affect the overall flight CofG. The hull underside area in front of the CofG is 4.805m2 and behind 2.371m2. The inflight air stream will be hitting the underside flat surface of the front section at about the same AOT as the wing cord line without flaps.
From an aerial view the hull will look a bit like a stingray with a wide area near the step (1750mm) to be stable in water without wing floats, a step in and then a narrowing tail section. The design is displacement balanced at rest in water to the same CofG as flight CofG with a slight tail down. Draft and floating level at MTOW 640kg is shown in the bottom right drawing.
The cross section drawing is the bulkhead at the step.
The hull will be completely sealed so in boating terms it would be referred to as a wet deck like a jet ski.
Drawings are of the hull only in 4 stages of on water operation and the bulkhead at the step.
KB
I am new to posting on this site, but have been reading posts on here for quite a while now and must congratulate the members on their willing and open discussion. It is refreshing to see in this era a group of people willing to help other enthusiast for the sake of helping.
A little about myself and my project.
My design is a tandem open cockpit 2 seat amphibian with a 100hp/68 inch prop as a pusher with a MTOW of 640kg and designed for saltwater application with a round a 5 year first flight build time from now.
If you think of a Super Drifter with the fuselage boom replaced with a floating hull as a general layout. 14.884 m2 USA35B Flapped Wing, VNE 85knots.
One area I am a little stuck, I expect the hull will have some in flight lift and with most of the hulls possible lifting area well forward of the wing CofG. I need to get a handle on how this may affect the overall flight CofG. The hull underside area in front of the CofG is 4.805m2 and behind 2.371m2. The inflight air stream will be hitting the underside flat surface of the front section at about the same AOT as the wing cord line without flaps.
From an aerial view the hull will look a bit like a stingray with a wide area near the step (1750mm) to be stable in water without wing floats, a step in and then a narrowing tail section. The design is displacement balanced at rest in water to the same CofG as flight CofG with a slight tail down. Draft and floating level at MTOW 640kg is shown in the bottom right drawing.
The cross section drawing is the bulkhead at the step.
The hull will be completely sealed so in boating terms it would be referred to as a wet deck like a jet ski.
Drawings are of the hull only in 4 stages of on water operation and the bulkhead at the step.
KB
