Engine Thrust 10ft BN2 Islander

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Andrew Brown
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Joined: January 8th, 2019, 9:29 pm
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Engine Thrust 10ft BN2 Islander

Postby Andrew Brown » November 5th, 2019, 11:59 pm

Hi All.
I'm after a bit of advice regarding thrust lines for a scratch built 10ft BN2 Islander.
A good friend of mine is in the process of finishing off two of these, suited for 2x DLE 20s and we're unsure of what degree of down/out-thrust (if any!) we should be using when mounting the engines.

The original plan is a 60" which has been doubled up to 120", however on the original plan there is no down-thrust built into the firewall, there is however 3 degrees of out-thrust on the left engine, and 4 degrees of out-thrust on the right engine, which is assumed to help with a potential engine failure.

Is it safe to assume that the same applies to the doubled up versions - i.e no down-thrust at all?
Any advice would be greatly appreciated! :)

I know there are a couple of larger Islanders on the circuit and would be interested to know what has been built into these models.

Many Thanks for your help!
Andy

Paul Savage 1568
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Joined: January 16th, 2009, 2:19 pm
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Re: Engine Thrust 10ft BN2 Islander

Postby Paul Savage 1568 » November 6th, 2019, 11:12 pm

Hi Andy,

I designed and built a semi scale Islander which was around the same size as the project you're currently working on.
It was adequately powered by a pair of SC 120 FS engines with no down or side thrust. It flew really nicely. The video link shows the model after I finally gave up with the vulnerable wing mounted under cart and replaced it with a more practical arrangement.
Hope this helps in some way and good luck with your project.

https://www.youtube.com/watch?v=gIGaQxFmOfQ



Paul.


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