diff --git a/docs/src/index.md b/docs/src/index.md
index c07c3367e..19ab607e0 100644
--- a/docs/src/index.md
+++ b/docs/src/index.md
@@ -83,7 +83,7 @@ times faster.
 - the documentation was improved
 
 ## Provides
-The type [`AbstractKiteModel`](@ref) with the implementation [`KPS3`](@ref), [`KPS4`](@ref) and [`SymbolicAWEModel`](@ref), representing the one point, the four point kite model and the ram air kite model, together with the high level simulation interface consisting of the functions [`init_sim!`](@ref) and [`next_step!`](@ref). Other kite models can be added inside or outside of this package by implementing the non-generic methods required for an AbstractKiteModel.
+The types [`KPS3`](@ref), [`KPS4`](@ref) and [`SymbolicAWEModel`](@ref), representing the one point, the four point kite model and the ram air kite model, together with the high level simulation interface consisting of the functions [`init_sim!`](@ref) and [`next_step!`](@ref). Other kite models can be added inside or outside of this package by implementing the non-generic methods required for an AbstractKiteModel.
 
 Additional functions to provide inputs and outputs of the model on each time step. In particular the constructor [`SysState`](@ref) can be called once per time step to create a SysState struct for
 logging or for displaying the state in a viewer. For the KPS3 and KPS4 model, once per time step the [`residual!`](@ref) function is called as many times as needed to find the solution at the end
diff --git a/docs/src/types.md b/docs/src/types.md
index 2cfa94078..faffcc9e6 100644
--- a/docs/src/types.md
+++ b/docs/src/types.md
@@ -9,7 +9,6 @@ CurrentModule = KiteModels
 SimFloat
 KVec3
 SVec3
-AbstractKiteModel
 AKM
 ```
 
diff --git a/src/KPS3.jl b/src/KPS3.jl
index 63d3c5fdb..4abe7c941 100644
--- a/src/KPS3.jl
+++ b/src/KPS3.jl
@@ -35,6 +35,8 @@ $(TYPEDFIELDS)
     am::AtmosphericModel = AtmosphericModel()
     "Reference to winch model as implemented in the package WinchModels"
     wm::Union{AbstractWinchModel, Nothing} = nothing
+    "Integrator, storing the current state"
+    integrator::Union{OrdinaryDiffEqCore.ODEIntegrator, Nothing} = nothing
     "Iterations, number of calls to the function residual!"
     iter:: Int64 = 0
     "Function for calculation the lift coefficent, using a spline based on the provided value pairs."
@@ -188,6 +190,10 @@ function KPS3(kcu::KCU)
     clear!(s)
     return s
 end
+function KPS3(set::Settings)
+    kcu = KCU(set)
+    KPS3(kcu)
+end
 
 """
     calc_drag(s::KPS3, v_segment, unit_vector, rho, last_tether_drag, v_app_perp)
diff --git a/src/KPS4.jl b/src/KPS4.jl
index c5dee9c65..88df56033 100644
--- a/src/KPS4.jl
+++ b/src/KPS4.jl
@@ -68,6 +68,8 @@ $(TYPEDFIELDS)
     am::AtmosphericModel = AtmosphericModel()
     "Reference to winch model as implemented in the package WinchModels"
     wm::AbstractWinchModel
+    "Integrator, storing the current state"
+    integrator::Union{OrdinaryDiffEqCore.ODEIntegrator, Nothing} = nothing
     "Iterations, number of calls to the function residual!"
     iter:: Int64 = 0
     "Function for calculation the lift coefficient, using a spline based on the provided value pairs."
@@ -233,6 +235,10 @@ function KPS4(kcu::KCU)
     clear!(s)
     return s
 end
+function KPS4(set::Settings)
+    kcu = KCU(set)
+    KPS4(kcu)
+end
 
 """ 
     calc_particle_forces!(s::KPS4, pos1, pos2, vel1, vel2, spring, segments, d_tether, rho, i)
diff --git a/src/KiteModels.jl b/src/KiteModels.jl
index 92fb29d3a..b3f2a4528 100644
--- a/src/KiteModels.jl
+++ b/src/KiteModels.jl
@@ -81,14 +81,6 @@ Basic 3-dimensional vector, stack allocated, immutable.
 """
 const SVec3    = SVector{3, SimFloat}  
 
-"""
-    abstract type AbstractKiteModel
-
-All kite models must inherit from this type. All methods that are defined on this type must work
-with all kite models. All exported methods must work on this type. 
-"""
-abstract type AbstractKiteModel end
-
 """
     const AKM = AbstractKiteModel
 
diff --git a/test/runtests.jl b/test/runtests.jl
index cdc5e5721..92ef7faf6 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -37,5 +37,7 @@ KiteUtils.set_data_path("")
     println("--> 4")
     include("test_inertia_calculation.jl")
     println("--> 5")
+    include("test_interface.jl")
+    println("--> 6")
     include("aqua.jl")
 end
\ No newline at end of file
diff --git a/test/test_interface.jl b/test/test_interface.jl
new file mode 100644
index 000000000..32c6fe83d
--- /dev/null
+++ b/test/test_interface.jl
@@ -0,0 +1,33 @@
+# SPDX-FileCopyrightText: 2025 Uwe Fechner
+# SPDX-License-Identifier: MIT
+
+using KiteModels, KiteUtils, Test
+
+set = load_settings("system.yaml")
+kps3::KPS3 = KPS3(set)
+kps4::KPS4 = KPS4(set)
+set = load_settings("system_ram.yaml")
+sam::SymbolicAWEModel = SymbolicAWEModel(set)
+
+@testset "KPS3 constructor interface" begin
+    @test kps3 isa KiteUtils.AbstractKiteModel
+    @test kps3.set isa KiteUtils.Settings
+    @test isnothing(kps3.integrator)
+    @test kps3.am isa AtmosphericModel
+    @test kps3.iter isa Int64
+end
+@testset "KPS4 constructor interface" begin
+    @test kps4 isa KiteUtils.AbstractKiteModel
+    @test kps4.set isa KiteUtils.Settings
+    @test isnothing(kps4.integrator)
+    @test kps4.am isa AtmosphericModel
+    @test kps4.iter isa Int64
+end
+@testset "SymbolicAWEModel constructor interface" begin
+    @test sam isa KiteUtils.AbstractKiteModel
+    @test sam.set isa KiteUtils.Settings
+    @test isnothing(sam.integrator)
+    @test sam.am isa AtmosphericModel
+    @test sam.iter isa Int64
+end
+nothing