Case in point we purchased a property that tripled in equity after purchase.

Check the HOA reserve budget to see if any assessments are on the horizon and the triple check your numbers.

I feel like I should be able to double the money within two years, triple it within 3 and so on....

Just to be clear, the property has appreciated 100k in 2 years so I will have tripled my initial 35k investment

For an investor with a larger risk appetite, you can trade commodities futures...which have the potential to generate triple digit returns annually.

And Duvet or triple sheeting?

The other two are solid doubles and triples.

I've also been able to increase the rents on the property to $1800 a month, making my net income $400 a month on average. it's been 5 years since purchase and I have already received back triple the money I put into the property in just the equity draw. 

@Keith SmithHowever much money you think you will need, triple it.

Some of my properties I bought in Los Angeles within last 5-9yrs almost tripled.