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Author Topic: Trimming KK Eaglet  (Read 265 times)
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Viperkite
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« on: April 12, 2019, 12:23:02 PM »

Just trimmed a Keilkraft Eaglet. No CoG on the plan so kept adding clay until it glided. Under power kept stalling until I reduced incidence on both wing and tailplane with fiddly bits of balsa. It nearly buggered off out of the field because I haven't fitted a trim tab yet and it flew in a straight line. Still need to make the decalage permanent but have high hopes for the model.
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VictorY
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« Reply #1 on: April 12, 2019, 12:35:05 PM »

Adjust glide with aerodynamic trimming like incidence changes and trim tabs, as well as weight changes. Adjust powered flight with thrust angle on the prop. If you start adjusting powered flight with aero changes, you ruin the work you put in on the glide. I'm sure there are exceptions but that seems to be the rule. One of the members put together a nice strategy for trimming if you want it.
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Viperkite
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« Reply #2 on: April 12, 2019, 12:41:52 PM »

Adjusting the noseblock made it worse in every way. It does fly well with the adjustments I made, but the permanent setup will just have the tailplane tweaked.
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billdennis747
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« Reply #3 on: April 12, 2019, 01:26:53 PM »

Just trimmed a Keilkraft Eaglet. No CoG on the plan so kept adding clay until it glided.
Balance it on the spar and go from there, as VictorY advises
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Viperkite
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« Reply #4 on: April 12, 2019, 01:32:31 PM »

That's how I rough trimmed it, but it did need more. I recently made a Senator, gave it a standard two-wheel undercart and it came off the building board in perfect trim, no clay, no noseblock adjustment and no incidence changes. First model I have ever had that with.
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Newbie_John
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« Reply #5 on: April 13, 2019, 07:40:36 AM »

Hi VictorY,
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One of the members put together a nice strategy for trimming if you want it.

As a relative beginner to this stuff, I'd really appreciate a copy of the trimming strategy - do you have a link?
Many thanks,
John
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DLS
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« Reply #6 on: April 13, 2019, 09:32:03 AM »

Don DeLoach wrote a very good article about trimming. Google My approach to rubber scale flying
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VictorY
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« Reply #7 on: April 13, 2019, 10:31:48 AM »

Hi VictorY,
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One of the members put together a nice strategy for trimming if you want it.

As a relative beginner to this stuff, I'd really appreciate a copy of the trimming strategy - do you have a link?
Many thanks,
John

Here you go. http://www.gryffinaero.com/models/ffpages/tips/10step.html
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Newbie_John
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« Reply #8 on: April 13, 2019, 01:03:13 PM »

What great info, VictorY - many thanks indeed for the link!

and I've also downloaded Don DeLoach's article, thanks DLS!

John
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