Ivan Pettigrew Planes - Build Threads and Videos - Page 224 - RC Groups
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This thread is privately moderated by LukeZ, who may elect to delete unwanted replies.
May 08, 2017, 03:04 PM
Slip the surly bonds...
Sopwith Mike's Avatar
Superb. I like the undercarriage very much and wish you all the best with the rest of the build, and that first flight, of course!
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May 09, 2017, 12:37 AM
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LukeZ's Avatar
Not even finished and she looks magnificent already! Your skill with a covering iron is quite evident.
May 17, 2017, 07:57 AM
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hi lukez

do you have an email? or can i send you a pm?

May 18, 2017, 12:13 AM
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LukeZ's Avatar
Please do send me a PM here at RCGroups.
May 18, 2017, 03:04 AM
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hi lukez

i couldnt send you a pm , could you send me pm then i can maybe reply , maybe that will work

May 26, 2017, 04:17 AM
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SHK1ECG's Avatar

Sealand query

Hi folks, hope you are all enjoying the better weather.

Just working through the pre-maiden snagging list on the Sealand, having completed the undercarriage doors. I also managed to set up my Multiplex transmitter to give differential throttle for steering on the water - took a while to sort that one out!

The control movements as given n the plan seem to be very large compared to my other models. This may be to give more control on the water at low speed, or because the model flies comparatively slowly?

With all the Sealand experience out there, would you advise going with the plan settings or reducing them? I normally set low rates at 70% of full rates, and expo at -30 for ailerons and elevator.

Any advice will be gratefully received.
May 26, 2017, 11:57 AM
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pentaxman's Avatar
I can't personally speak for the Sealand, but I have not yet had to deviate from Ivans suggested control deflections on any of my machines.

As for the other settings, I pretty much do as you have suggetsed, -30 expo on ailerons and elevator at full and part rates, and 65 - 70 % rates on ailerons and elevator. Never had to use low rates yet, even for learners who have a go on the Chipmunk with buddy box.

Good luck
Last edited by pentaxman; May 26, 2017 at 12:57 PM.
May 26, 2017, 04:00 PM
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Trevorh's Avatar
Martin, I don't recall any issues with the control throws on my Sealand, although I might have reduced the elevator travel a bit in subsequent flights. I haven't got a note of the travels but if you are still concerned, I'll put the model together and do some measurements.
May 27, 2017, 07:27 AM
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SHK1ECG's Avatar
Thanks for the info. I will stick with Ivan's settings, but will probably fly initially on low rates.

Just had to recover an aileron as it needed shortening slightly to give better clearance at the ends. Should have checked more carefully before I covered it the first time!

Balance point was spot on with a 3S 3600 lipo, Flying weight is 82 oz.

Next job is to annoy the fish and do a flotation test in the pond.
May 27, 2017, 12:14 PM
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SHK1ECG's Avatar

Sealand complete

All jobs and testing completed, hoping for a weather window tomorrow.

Pics of-
flotation test with U/C doors closed,
in land based mode,
close up of U/C doors open.
May 27, 2017, 02:08 PM
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Trevorh's Avatar
Looking great Martin! Good luck with the maiden - and if you fancy a trip down to Longham, let me know and we'll try to get the two Sealands in the air together. Hopefully we will be able to make a better fist of flying them in formation th we managed with the Stearmans a couple of years ago!

May 27, 2017, 03:31 PM
What could possibly go wrong?
nickchud's Avatar
Or bring it to the BIMBOs on 28-30 July at Arthingworth and Cransley.

May 28, 2017, 11:32 AM
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SHK1ECG's Avatar

Sealand maiden successfully completed

The weather window duly materialised, so took Sealand with Twotter for company (and a practice circuit).

No dramas, used half flap on the first takeoff. Needs full up elevator when taxiing on grass (bigger wheels may have been better), but with takeoff power no further problem.

Plenty of power, cruises at half throttle and looped without difficulty. Stalls a non-event, would gently drop the port wing if really provoked. Very little trim change with flaps.

Differential throttles very responsive when taxiing on the grass - meaning that the tailwheel could do with more authority. As the springs are buried in the fus I will have to live with it.

Three flights in all, with no scares and nothing broken.

We will be at the BIMBOs meet - plan to bring Sealand, Twotter (with floats) and a brace of Turbuli.

Thanks for the offer of Langham, Trevor. Diary is pretty full at the moment, may be possible.
May 28, 2017, 02:09 PM
meatbomber's Avatar
Awesome the retracts really add another dimension to the sealand !
May 28, 2017, 03:51 PM
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Trevorh's Avatar
Brilliant Martin - and nice pics too. I look forward to seeing it soon.

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