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RCPowers and FRCFoamies - Mossie and Lancaster

Old 01-08-2019, 11:07 AM
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solentlife
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Default RCPowers and FRCFoamies - Mossie and Lancaster

Normally I do not pay for plans ... yes I'm a cheapskate !! My usual haunts are Hippocket and so on ... where thousands of plans have ended up.

But as many know - I have a particular love affair with two aircraft : Dh Mosquito and the Avro Lancaster.

Free plans for these are there - but all full fuselage and require a reasonable length of time and skill to build. Always on the lookout for simpler versions - I caught that RCPowers (under new 'management') had basically folded foam plan versions. The Lancaster having been shown in a recent UK RCM&E magazine. The Lancaster flying well on 2S and prop hanging !! on a 3S ..

I HAD to have some of this !!

So Paypal and both Mossie and Lanc are now on my hard-drive. Once I get started on them - I will post up the builds as they progress ...

I have to confess - folded foam I have not done before ...

​​​​​​​Nigel
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Old 01-08-2019, 12:21 PM
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I'll follow that
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Old 01-08-2019, 03:55 PM
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The Mossie flight vid is VERY SWEET !!


http://www.frcfoamies.com/dh-havilland-mosquito.html

I will be looking to see if retracts can be fitted ...

Nigel

Last edited by solentlife; 01-11-2019 at 07:02 PM.
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Old 01-11-2019, 06:51 PM
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NICE!!!
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Old 01-11-2019, 07:21 PM
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The build is coming on of the Mossie ... my workspace is like a bombsite !! so excuse the mess !! Stuck for space until I get workshop done.

Ok ... basic fuselage as a flat plate and then spine and formers added ... wing is half sections glued to the flat plate fuselage. Imagine a profile model - then formers added ...







The engine pods 'nacelles' are created by using a spine and then 'folded' foam casing.



The same folded foam system will be used for the fuselage shell.

The folded system of course leaves the 'trenches' where foam is cut and folded ... so i will be looking at ways to fill without adding weight. I may cover the model with lightweight Nysilk with PVA ...

Wing ... best way to describe that ... again flat plate base .. with what is similar to a KM layer but folded and raised by a spar to create an aerofoil form.

Motors are to be the Turnigy L2210 1400kv bell motors with 7x4 3 bladers ... 30A ESC and 2S lipo with 3S on standby in case needed !
Retracts will be fitted of course ... the small 33x25mm Hobby King set that are sane as used in the HK Lancaster. Shame that I cannot get the Lancaster plastic legs to add to the metal rod ...

Interesting build ...

Nigel
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Old 01-16-2019, 07:27 PM
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Well it all goes together !!

Wing spar etc.



Fitting folded fuselage shell





Starting to fit gear



Because I am waiting ESC's and motors ... I cannot glue on top wing panels yet.

back end controls



Yes - I have fitted retracts



Wing panels laid on to rough out the paint scheme ...



Plans indicate 8x4 3 bladers but eCalc shows that 6x4 3 bladers are more than enough to get this baby going on 1400kv .. and 3S



One panel in place now that ESC's arrived and I already had one motor (2210 Bell motor 1400kv)





Once other motor arrives and wing panel fitted ... the folds will be filled and final painting done. With an overall matt varnish to complete before decals applied.

Really looking fwd to this !!

Nigel
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Old 01-21-2019, 12:15 PM
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Just waiting on that last motor - very frustrating ! ... then fit ... glue wing top on .. paint and then recheck location of gear to balance on the spar. I need to leave that top skin of so I can feed and fix motor wires / ESC in place.



Reason she leans is that the tail skid is not fixed and has collapsed !

She will have HE SuperII Stab, FrSky 8ch, Soloshot mount, arranged inside.

Retracts along with the usual ailerons, elevator and rudder.

Motors have 15% differential programmed in to give me better handling on ground.

Over-prop'd with 9x4.5 3 bladers contra props on the 2210 1400KV with 3S lipo ... but that's to keep the throttle lower and sound better. Originally I was going to use the 6x4 or 7x5 ... but that would mean higher throttle and high pitched sound. Not really in keeping with the Mossie !!

nigel
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Old 01-24-2019, 07:54 AM
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Motor arrived ... wing skin fitted ... painted ....











Now waiting suitable day !

Nigel
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Old 01-27-2019, 09:09 AM
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Really mad with MYSELF !!

Yesterday 26 Jan was a great day .. cold, -7C but little or no wind .... so I decided it was time to maiden the Mosquito.


What I cannot underatsnd is why two ... yes two ... brand new LiPo's showed same problem while others older were fine.

The LiPo's were Blue Turnigy 1800 3S 40C ....

First went into the Mosquito in the video and shortly after take--off I had battery alarm. I had to pull throttle back to half or less to stop the alarm sounding ... this put me in a situation of any more slow and OOOP'S ... would be the result. I lowered retracts to prepare to land ... but one refused to lower completely ... so STUPIDLY - I decided to go round and try UP / Down repeatedly to see if it would free ... THIS was my real mistake ... to drag out that battery longer ...
As you see and hear on that turn to line up ... she said - No Way Joe !

The second sister LiPo I put in my Polaris and it was same ... literally seconds after take-off it went down ... landed Polaris and swapped out to an old trusty 2200 Compact and fine.

Damage is repairable and she will be back again.. smashed nose, split stbd nacelle and both motor mounts loose. Wing sheet split top and bottom but clean splits. Fuselage side pieces on stbd side - but its just plain jigsaw puzzle to fix.

But she was gorgeous in the air ... well worth effort to repair.

Nigel.
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Old 01-27-2019, 12:24 PM
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Think the cold air had anything to do with the battery failure?
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Old 01-27-2019, 01:44 PM
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That was my initial thought. But immediately prior to that - I flew my Eurofighter which has the battery pack directly open to all air flow ... flew as usual - fine.

The Mossie battery came from my battery bag from inside the car ... and is enclosed inside the foam body ...

I later flew my Polaris with the other same battery and that failed as well ... but swapped to an old battery and all was fine,

I have to admit I was not happy about the Wattmeter test at home :

3S 1800 40C pack ... 26A and 0.5 ~ 0.6V voltage drop at WOT. I stupidly assumed that as I did not need full throttle to fly - I would risk it ... evdently not.

Mossie is already on bench being fixed.
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Old 01-27-2019, 03:36 PM
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That is tough!
Being an ex glider pilot I would have had no hesitation in belly landing it certainly as soon as there was an issue with the U/C or even if I was not happy with the battery!
Belly landing damage (if any!) is usually much less than from any sort of crash.
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Old 01-27-2019, 04:30 PM
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Totally agree ... and I learnt on Slope ... Butser Hill .. so I should know better.

But being human - we make mistakes !

She's going back together well ... cut out the worst at the front ... scarf in new parts ...

I'm now wondering whether to change the motors ... as you know Q - the RCPowers guys are flyng her on 2S ... but of course averaging about 27 - 30oz instead of 38.

At 100W per lb for flight and about 150W per lb for throw about ability ... I'm thinking that the 200W each motors I have are possibly a bit too much and dropping back to about 150W each may give me back some battery time. I know that in the end you throttle to fly so it may not be such a great advantage.

Decisions decisions ....
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Old 01-27-2019, 08:15 PM
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solentlife
It really all comes down to weight.
If you are throttling back significantly then some of your 200W motor is just unnecessary weight. As you suggest all you need is just enough for hand launching and the duration at that power level is measured seconds.
If you are thinking of changing to lower power motors try and find lower kV ones to allow you to keep the same big props.
Net result you end up with less weight (less power to fly) and better prop efficiency (you are not driving them so hard) which just might equal a better flight time.
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Old 01-28-2019, 08:58 AM
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Strange thing is the RCP guys are generally using a less power motor - same kv of 1400 - but bigger props than myself ... on 2S. I have 7x4x3 ... they use 8x4.5x3 and that 2S.

Lets get her back together and then I'll have a think about it ...

Cheers
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Old 01-29-2019, 06:24 PM
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OK .... repairs completed ... just need to varnish the water based paints ...

Here's the run of repairs ...

Crash damage :





Cut out concertina'd foam and also get to ESC's etc as I have a cogging motor and possible ESC failure ..



Scafr in new formers and spline for the nose ..



Piecing back like a jigsaw puzzle ..



Make sure hatch still mates ..



planking up nose ..





May not be Concours ... but will do for test second maiden ... then will set to fill those 'holes' ... she still has to have her varnish top coat - that then darkens the poster paints and will blend all in ..



Motors are out ... swapped to Floaterjet motors and 7x3.5x3 Gemfan flexi props ...
Spinners are 3D printed specially for this model.

ALL works ... even that retract !!

Weather now is snowing ... cold ... and blustery winds ... will be quite a while before she gets a re-maiden. May just fill those holes / improve her looks while waiting.

Nigel
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Old 03-17-2019, 06:05 PM
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Cold blustery wet winds ............... but decided to go for it ..... swapped to 6x4x3 props on 2200 3S .



Magic ! But oh that wind ...
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Old 04-09-2019, 12:26 PM
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Sunday 7 April ... silly me - over-ran my battery and she went in.

On checking at home - CF spar is shredded ... and with her being overweight - decided to strip out all gear and will build a new one.

Here's the flight :


Sad but ... I learnt a lot that I can now use in the new build.
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Old 04-12-2019, 01:15 PM
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New build is in progress...
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Old 06-30-2019, 09:59 AM
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All done --- ready to go ...



Retracts of course



1100mm span
810mm length

870gr without battery

3S 2200 puts CoG spot on.

7x4 3 bladers
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