Ever thought of building your own wind tunnel to test engine and propeller set ups. For the price of a couple of top line F3d models, Mike Smith is on the case, building this fine looking test rig for the control line speed and team racers, Mike has told me that it can be modified easily for larger F3d engines. If you’re interested let me know and I will put you in contact with Mike.
This is a “Wind Tunnel/Test Flow rig” to test model aeroplane engines and in particular F2A racing engines and Single Blade Propellers. It was designed and built by mike Smith to run 2.5cc engines up to 290 K.P.H using a “Flight propeller”.
It has a centrifugal fan with a capacity of 7,200 cubic meters an hour = 2 Cubic meters a Second. This is driven by two 2.5 HP single phase motors via a belt drive at a speed of 1600 RPM. There is an electrical control box to provide 1.5V for the glow plug and a 12V supply to power the light source for the rev counter. The exhaust is directed into a firearm “type” silencer and is extracted by vacuum and vented to the outside of the test cell. There is a sliding section of ducting that enables a quick maintenance of the engine or change of the propeller. To compensate for flight centrifugal fuel pressure the tank can be raised to approximate 40 G. To measure the airspeed of the rig there is a Pitot tube connected to an angled glass manometer. The engine and pan are swung by a pendulum with a counterbalanced arm connected to a variable weight’s to measure the engine thrust. There are two stops (front & back) wired to red and green lights. When running, weight is added the pendulum arm until the green light is extinguished and the red illuminated. This gives the thrust force via a small calculation. It was calibrated using an Irvine 15R Halman Special and a Profi 15 Back to back. The photos were taken during manufacture. A complete set of drawings and details will be supplied.
The rig is 2.7 Meters high, 0.5 wide and 2.9 long. And weighs 170 Kilos.
For shipping it will condensed into a 2.5 meters x 1.5 x 0.5 box and can be sent overseas by container.