New throttle system for Rotax

[Kyle Communications]

Work is progressing on the production version of the throttle mod

 

The hand made brackets I have now drawn up and modelled in 3D software. This then allows me to 3D print 100% size versions with reasonable accuracy so we know what we get when everything is laser cut. There has been a few revisions done to get the angles correct and some hole spacings. Had a test fit tonight of the main shaft and brackets..The levers and bearing blocks are all perfect now all looks really good just need to extend both the top bracket mounting holes at the rear about 1.5mm to allow for the bends in the brackets. Then print some more models with all bits attached including the carb throttle lever and finalise it then I can think about the laser cutter guys

 

 

 

 

[FlyBoy1960]

I don't know if this picture is any use to you but the only thing I would be worrying about that could upset this system you are proposing is if you start to get some vibration happening especially because you are putting a little bit of extra weight on the backend of the carburettor which could make the intake manifold more vulnerable to cracking.

 

I don't remember what aircraft this photograph was taken from but it shows how they made a simple bracket that stopped any carburettor movement whatsoever.

 

This may be a necessary addition to the whole system you are designing to stop any vibration or harmonics entering the installation you are completing.

 

[Kyle Communications]

I have never seen that bracket before thanks for the picture...The whole system doesnt weigh much at all and it does tie both carbs together so not sure if it would be a problem. Dannys has an hour or two up on the original so far and no issues and will have another few hours up on it after this weekend as he is flying to the savannah muster on saturday. Carb balance is extremely rock solid too. I am making up a onboard carb balance monitor that will sit on the dash and connect to the ports on the carbs themselves rather than disconnecting the balance tube to do it. I have found a pressure sensor that should be perfect for doing that then will just have a LED bargraph that you can look at while flying or turn it around so you can adjust the balance while at the front of the plane.

 

The only thing I hadnt considered was if you had pods and not a airbox. Those pics show there maybe a small issue of clearance, This was designed for a savannah which has a specfic airbox. I have a set of pods here so will fit them to the spare engine and check clearance and see if the one system can be made to do both types of air intakes

[Downunder]

I can't see how you can check carb balance without isolating the balance tube?