This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.

Simple Basic Mechanical Variable Flow

This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.

Simple Basic Mechanical Variable Flow

This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.

Simple Basic Mechanical Variable Flow

This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.

Simple Basic Mechanical Variable Flow

This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.

Simple Basic Mechanical Variable Flow

A quick population rate model to help get acquainted to modular designs.

Population Simple Tutorial First

A quick population rate model to help get acquainted to modular designs.

Population Simple Tutorial First

first attempt at an Insight model

Population Simple

A quick population rate model to help get acquainted to modular designs.

Population Simple Tutorial First

A toy model to see what happens to employment when people must move through various states to get to certain jobs

Economy Employment Simple

Simple model for new product sales that contemplates the effect of success and competition.
Sales initially grow as the new product moves from introduction into growth.  Sales success attracts competitors who introduce their own products which reduces sales growth of the new product.
Eventually the total number of products that the market can bear are sold which stops further sales.
More advanced models could contemplate how competition affects price, how new successful products from competitors take market share, etc.

Simple Product Sale