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From Gerry’s Workshop — Firewall designation for a Zenoah G-38

We always demeanour for good techniques to share with a readers so we reached behind to some of my Sopwith Camel Build-along posts. With this post we spin a attentions to a front finish and work on a firewall installation. The techniques can be used with any RC indication we wish to cgange so we can hang a gas engine on a nose.

So before installing a firewall with a scold down and right-side bearing offsets, we had to work on a engine designation and a soft-mounts and scarf clearance.


For 2 degrees of down and 2 degrees of right thrust, we equivalent a centerlines on a firewall 1/4 in. in a conflicting directions, so a engine’s column missile would be centered in a cowling.


Here is a batch G-38 mountain image we have on a engine. To transparent a soft-mount isolators so they would not hold a scarf box nonetheless to be built into a model, we had to cavalcade new holes in a reduce section.


Also to concede a mountain image to set prosaic opposite a soft-mounts, we counter-sunk and commissioned flush connection screws to secure a engine to a mountain plate.

I thereafter centered a mountain image with a equivalent centerlines and drilled out a holes for a isolators. The scarf clearway was eliminated from a side perspective of a plans. This way, when a enclosing box is glued into place there is scold clearway for a ascent hardware and a scarf to fit into a box.

Here we am exam wise a engine and muffler. Plenty of clearway all a approach around.

Here is a front of a firewall, As we can see, a soothing mounts would not have privileged a scarf if we used a aged ascent holes.

Next regulating a side views we commissioned a tristock subsidy strips for a firewall. They are also equivalent so a 2 degrees of right and 2 degrees of down bearing will be set when a firewall is glued into place.

With a fuselage upside-down, we trip a engine and firewall public into place.

A good fit and a bearing angles are correct. Remember a fuselage is upside down.

Before gluing a firewall in, we done certain a scarf would also fit and transparent a cell to be commissioned afterwards.

After stealing a engine and soothing mounts, we placed a fuselage on a side and epoxied a firewall into places. we used lead weights to make certain a glue joints fit cosy opposite a behind support tristocks strips.

Placing a fuselage upside down again, we glued in a front support strips. we checked a angles and centerlines during a whole process.

Here’s an abaft perspective of a finished installation. The former shown here will be used to support a front of a fuel tank supports.

Remember, for good laser-cut parts, use Trillium Balsa (

That’s it for now. Now on to a alighting rigging connection blocks. Stay tuned.

To go to a subsequent installment (Part 4,) click  a link:

To see Part 2 of a build-along go to:



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