Airspeed indicator for $99
Heres my thoughts on this. If the unit was inexpensive (under $100), I could see a need for this type of product.
My questions would be:
How big would the unit be?
Could it be plugged into your current receiver battery, or would it need a seperate battery?
How quick and easy would it be to swap out into another plane?
Would it max out? In other words at what speed, would it no longer work?
I think simplicity, ease of use, and a low cost will make a product like this a winner. There are already several products out there that seem to do everything including PC interface.
Keep it simple and cheap, and I think you have a market.