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Regal Eagle refurb


Dad_flyer
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And so, 4 becomes 2.

806672186_IMG_20220509_2151598232.thumb.jpg.00d1711d13e92741dea5c58967a05aef.jpg

More than a month just to deal with a hinge and fit two servos! I did not even have to put in bearers or linkages, just screw them in.

Both surfaces have too much movement. They are in the servo arm holes that they came to me in, and bringing them in any further they would bind on the clevises.

 

I shall leave well alone there. The rudder really needs a longer plate for the plate with the pull-pull wires so that the servo could be outside the wire attachment.

 

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  • 1 month later...

At last pressed go on the last few bits yesterday, arrived today from Slough RC and 4-Max. Great service as usual.

When the 4-max one came, I could not think what I had ordered. It was l long package, but I did not remember getting push-rods or anything.

The answer, a prop as big as the wing of my first model!

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It looks a more sensible size against the intended cowl.

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The motor is a lump too.

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Edited by Dad_flyer
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Having almost given up, after searching for about an hour on-and-off, it was in the box with the box for the new transmitter.

Which also means I have found the receiver which I had forgotten was also mislaid, and the XT90 anti-spark connectors.

Edited by Dad_flyer
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  • 4 weeks later...

A friend lent me a laser cutter 😃.

I have mocked up a mount to get the motor in the right place, with a platform for the ESC on top and side plates matching the fuselage width to fix the battery mounting to. This is version 3

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A couple more modifications, then cut from 1/8" ply instead of 1/8" card. There will be a double thickness front firewall. For peace of mind only really, the motor is actually held from the main firewall by M5 studding right through the box.

Edited by Dad_flyer
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On 09/05/2022 at 22:15, J D 8 said:

   I would say leave alone but set up rates with lower movement then fly and see.

Just be aware that if you can achieve the required movement or very near to it mechanically allowing the servo to use much of it arc as possible then you will get smoother action and accuracy.  Turning down movement using just the rates will loose accuracy . 

As I remember the Regal Eagle wasn't a difficult model to set up so providing you set CG correct and don't use 3D type control throws you will be fine.

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Thanks ED. I did manage to move the elevator in a hole (I think) for that reason, and also you get more of the available torque on the control surface. I shall see if I can re-do the rudder crank. I got crimp ferrules yesterday at the Woodspring Wings show, so I can now refit the pull-pull wires if I do change anything. However it did fly with the previous two owners when coupled like this, so it must be at least OK ..

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A bit more this evening. Motor mount finalised as version 4 and cut from 3mm ply.

Back plate tacked to the firewall with cyano to drill the holes. A plug in the central hole aids alignment.

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Which are the new mounting holes?!

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Box loosely assembled and looks about right. Now I shall glue it all together.

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Edited by Dad_flyer
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Are you sure that firewall is up to it? Yes it appears pretty thick, but if it's been soaked in fuel for years and has that many holes I'm not sure I'd trust it. The bond at the top (highlighted in orange) looks somewhat sketchy...

 

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Edited by MattyB
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I think it is solid. The wood feels hard when I drilled it and the surface feels hard. 5/8" thick I think. The part you have highlighted is a replaced thin ply decking. From the inside it is this:

IMG_20220715_173056568.thumb.jpg.a2ea62b2d3266168a2d7357677d0bc1a.jpg

The main join is to the flat sides, and there are wedges to increase the gluing area. I don't see anything that looks weak?

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On 20/09/2021 at 13:55, Martin Harris - Moderator said:

A model of this size is quite practical to fly below 400’ but a large loop will be pushing it unless you’re confident enough to start and finish relatively low. Best to use telemetry to monitor your height - if your radio doesn’t support it perhaps a club mate could do a temporary installation of a sensor and receiver?

I just rely on experience and judgement.  So far, I've never judged my height to be more than about 399 ft., give or take a foot...

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I rigged up a trial Vanessa rig to check the CG. The batteries need to be almost completely out of the cowl. I think I shall still put them on the outside, made up as exhausts, rather than fitting inside. The pilot had a go too.

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All up weight is a small amount under the magic 7.5kg at present, but the battery mount and receiver still to come...

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  • 1 month later...

It has been a while, and not much progress to see. I took her to the club on barbecue day, it was a bit windy so I was only taking one model to fly. Several previous owners of Regal Eagles there who were able to have a look over to check I had not missed anything major 🙃.

 

I have now tidied up the wiring, drilled out the props, and today I had a quick engine test. No video, an electric motor does not have the same crowd draw as one of Jon's glow twins.

 

On the 22x12 APC-E with 8s at a bit above storage charge it gave 5160rpm at 60-70A. This is the biggest recommended prop, and became suddenly loud just approaching WOT. I assume stalling or something at that speed.

 

A 20x13 got to 5700rpm at 60A. That should be plenty of thrust and pitch speed with a little less stress on everything, and more ground clearance.

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