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Mounting screws for horseshoe backplate Empty Mounting screws for horseshoe backplate

Post  roddie Mon Apr 22, 2024 8:25 pm

The Cox .049 product-engine (horseshoe) backplate can be mounted with small wood screws obviously.. but what's worth doing.. is worth doing right... especially when it comes to securely mounting an engine in an airframe. That said.. the horseshoe backplate has X4 holes for mounting radially. The holes all have a .125" (1/8") inside diameter.. so your screw "body" (threaded portion and shank) can be that diameter or less. The screw "head" obviously needs to be a larger diameter.. but ideally between .180" and .200" diameter. Any "washers" used (flat, lock or otherwise) also cannot exceed that diameter.

I'm being a tad conservative with these measurements.. but take a look at the photo below; where I'm using 5-40 threaded hex-head "cap-screws" for mounting my engine to a bulkhead/plate.. and you'll see that there's no room for a washer that's any larger of a diameter.. than that of the screw-head.


Mounting screws for horseshoe backplate 5_cap-10
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Post  Greenman38633 Mon Apr 22, 2024 9:06 pm

Looks Good to me. No need for a washer is what I am thinking
Right ?
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Post  roddie Mon Apr 22, 2024 11:17 pm

Greenman38633 wrote:Looks Good to me.  No need for a washer is what I am thinking
  Right ?

Correct.. not needed with screws shown.
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Post  KariFS Tue Apr 23, 2024 12:12 am

Spring-type lock washers are often about the same outer diameter as the head of the same size allen screw. I have used those in some tight spots that require a washer.

I like the horseshoe backplate especially because M3 bolts can be used, and being a DIN standard size, hardware like bolts, nuts, washers and especially captive nuts can be sourced easily. The #2 used in most other 049’s is about 2.2mm, hard to get anything except bolts and nuts, and even these I need to order. The slightly more common M2.5 won’t fit without drilling.


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