flyrotary@lancaironline.net Mailing List Archive

Bill and Lynn.

I did have an idea for a 2 piece plate sump, a while back which used a channel type sump side, in steel, with brackets welded to it. It would be very rigid the top of the channel ( flange would be the same as the sump flange, perhaps thicker material with a mirrored flange at the bottom ( hence channel). Because this channel with integral mounts would be so rigid, it would only require a flat or shaped al bottom plate to act as the sump bottom.

There could be baffles on the inside that act as stiffeners as well. I envisaged channel going from one side to the other at mount points or criss-crossed internally or both.

This would be very strong indeed and you could still take off the bottom plate, if you wanted to.

George ( down under)

George, I really liked your bellhousing! I believe with a guy like Larry cutting the form CNC yours would be the "way to go!" With a CNC'ed form I don't even think it would weigh more than a pound more. I like it because with simple add ons you could fit almost anything.Much more flexible. That is what you and Butch were after anyway right? An aside, you might look at the way that Mistral is going with the 20B based engine. The bellhousing is tapped and the bed mount is attached in the same position as your pads! The 2 rotor could use the lightest setup possible. The 3 rotor is light enough that a good mount a few pounds heavier wouldn't make any difference to me at all. I think you were going the right direction.

Bill Jepson (But then you knew that already didn't you George?)

That's why I designed a bellhousing ( with Butch) with side pads for engine mounts.

George (down under)

Robert,

Funny you should ask. I have been working on this problem for a while. Those devils at Mazda seem to have conspired to make the Renesis very hard to design a mount for. They took away the point for a mount on top of the engine. They moved the engine mount bolts all over the place and put a lot of exhaust and plumbing in the way . It was as if they sat down and said....how can we make this engine really really hard to instal in an airplane.

I would have to agree with Lynn on this one. I am going to use the plate option. I will be modifying it so that it is lower profile. The plate will be the size of the engine pan and the bolts will go in from the side. The standard conical mounts will be on the sides as close to the engine as I can get them. Imagine a hybrid between a bed mount and a P51 beam mount.

It is a difficult problem if you have a tight cowl.

Don't rely on the engine mount to help you if you loose a prop blade!!

Put at least a 3/16 safety cable on the engine.

There are some design suggestions here:

Monty

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