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Chris Freeman 308/05/2018 11:24:53
80 forum posts
88 photos

img-20180507-wa0002 (002).jpgimg-20180507-wa0001 (002).jpgFlew my Seagull Lysander, great aircraft.

img-20180507-wa0000 (002).jpg

Chris Freeman 308/05/2018 11:24:59
80 forum posts
88 photos

img-20180507-wa0002 (002).jpgimg-20180507-wa0001 (002).jpgFlew my Seagull Lysander, great aircraft.

img-20180507-wa0000 (002).jpg

Chris Freeman 308/05/2018 11:27:34
80 forum posts
88 photos

Before I build a new aircraft I check for information regarding the aircraft both full size and models. Quite a lot of information is available for the Seagull Lysander and most mention these faults:

CG position is too far forward

Stab incidence is wrong

Cowl is too long

Undercarriage is soft.

Reading up on the real aircraft I found that it had 2 main issues, 1 was a temperamental engine that would quit if incorrectly handled when opening the throttle and the adjustable tail plane had to be set correctly for the mode of flight as the elevators were not that powerful.

Most of the build blogs I saw were powered with 60cc and larger motors and a friend asked me to test his 5 Cylinder Magnum f/s so this was the main reason for me buying the Lysander as I thought it would be a great match. On reading the blogs I was concerned about the CG and incidence issues so I decided that I would test fly the airframe on Super Tigre and once sorted move on to the 5 cylinder. I first thought I would test fly with a 45cc but once I had a good look at the kit I thought that that much power was not needed and a 3250 would be plenty.

not used flaps. I elected to take it home to ensure all was still good before flying again.

So what am I changing, nothing so far. I want to fly it a little more before I decided what is needed. I think landing with a little flap is a good idea as it is more lift and drag so you can have a little power to help the elevators. If we are honest and you want to design a great flying aircraft it will not look anything like a Lysander, high aspect ratio wings with lots of taper and a low aspect ratio tail plane with lots of taper are not what you would expect on an aircraft. As this is a scale model, that is what you have to have so the challenge of flying scale aircraft is flying it in a scale manner. Each aircraft will have its quirks and that is what I enjoy is learning to live with them and that would mean fly a Lysander slow and gentle. If you feel the need for speed build a Mustang or Spitfire but then do not expect them to fly slowly.

Building the airframe was quite easy with the construction and fittings all being good and all the supplied parts and fittings being used. The overall design was very good and covering was excellent. A few parts construction were not clear, I had to cut slots in the wheel pants/covers to clear the strut attachments. I added ply to the rib for the elevator servo mountings and made a 6mm ply wedge to change the geometry of the tail wheel as it slanted forward not back. I also strengthened the wheel pants/ covers with 163 gram cloth and epoxy to make them stronger in the areas that I thought needed it. Epoxy was also added to the forward fuselage to fuel proof and strengthen the undercarriage area. I found that the wing could be moved up and down on the leading edge as the hole for the anti-rotation dowel was elongated. I made a template and added a second dowel to the rear of the root rib to prevent this play. When doing this I had the wing with the most positive incidence that was available.

Chris Walby08/05/2018 11:28:09
avatar
541 forum posts
96 photos

Great looking model, shadows are long and it looks rather cold where you are?

Chris Freeman 308/05/2018 11:28:13
80 forum posts
88 photos

I mounted the ST 3250 that my son had been given and found to my dismay that it would not run, I was faced with to options, one was to use another 3250 that I was not happy with or use a 30 year old reliable 30cc ST. I changed motors and test ran the 30 which seemed strong and reliable. My main question was now would it be enough as I am in Johannesburg South Africa which is 5500 feet above sea level so this affects lift and engine performance. I reasoned with Myself that a ¼ J3 would fly well on a 90 2 stroke and a 120 F/S and this was the same amount of wing so allowing for more drag and higher weight the 30 cc should be enough power. A local modeller posted pictures of a Seagull Lysander that he test flew a week before and I contacted him to query what they had done and also what the aircraft flew like. They had not changed the incidence on the stab but had moved the cg to 10mm behind the leading edge at the root of the wing. Flight performance was great and over powered with a twin cylinder 60cc motor.

I got my aircraft to the airworthy stage so I could test fly to see for myself what the performance was like as the varied reports do cast doubts of the flying qualities and the fact that I have never seen a previous model in my 45+ years of modelling seemed to indicate that it would not be an easy flying aircraft. I balanced the model on my fingertips at around 10mm on the leading edge and did not change the incidence of the stab. Sunday morning early I picked up my son and we went to the flying field and assembled the aircraft before there was even enough light to fly. Range check done with the motor running just to ensure all was good, final control checks done and time to see if it flies!

Take off was brisk and climb out was brisk and quite a bit of up trim needed but all other controls were fine. I throttled back to less than a 1/3 throttle for some circuits but found it hard to slow down, the Lysander was too fast for scale even with low power. I let Byron fly it and he climbed and did a stall test and it just slows down to a ridiculously slow speed with no bad habits. Byron also had a problem slowing it down so we landed and changed the prop from a 20x8 Top Flight to a Master Airscrew 20x6. Next flight was a bit better speed wise and still plenty of power for climbs. Landing was a little fast as Byron complained that he ran out of up but had not given power to help and had not used flaps. I elected to take it home to ensure all was still good before flying again.

So what am I changing, nothing so far. I want to fly it a little more before I decided what is needed. I think landing with a little flap is a good idea as it is more lift and drag so you can have a little power to help the elevators. If we are honest and you want to design a great flying aircraft it will not look anything like a Lysander, high aspect ratio wings with lots of taper and a low aspect ratio tail plane with lots of taper are not what you would expect on an aircraft. As this is a scale model, that is what you have to have so the challenge of flying scale aircraft is flying it in a scale manner. Each aircraft will have its quirks and that is what I enjoy is learning to live with them and that would mean fly a Lysander slow and gentle. If you feel the need for speed build a Mustang or Spitfire but then do not expect them to fly slowly.

This is a great aircraft that I look forward to flying for many years and commend Seagull for producing such a great unusual aircraft, I love it.

Martian08/05/2018 20:18:22
1896 forum posts
910 photos

my recently completed Spitfire

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Max Z16/05/2018 19:19:48
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437 forum posts
203 photos

Radio-assist free flight model for an upcoming "Dutch Old Warden" event:

p1030163.jpg

p1030165.jpg

It is a 150% version of Walter Musciano's PeeWee Pal from the '60s, suitably adapted to RC and sporting some design alterations of my preference.

martin collins 116/05/2018 19:43:19
32 forum posts
11 photos

Very nice, looks nicely finished and very unusual.............

Chris Barlow16/05/2018 22:31:58
avatar
1749 forum posts
1192 photos

Finally the successful maiden of my Vic Smeed Popsie bought at the Deanwater swapmeet.

Built as a 3 channel RC model the first attempt to fly was with the supplied geared, brushed motor on a 2S LiPo which was woefully under powered. 2nd attempt was with 3S which had more power but burnt the brushed motor out on the take off run!

Despite wanting to keep the old geared unit I succumbed and fitted a brushless motor, mounted to a 20mm motor box glued to the firewall. 3rd maiden attempt tonight was interesting. 9mph wing and quite tail heavy made for some erratic flying but ended with a safe landing.

A chunk of lead in the nose and attempt No 4 was much better although the wind was way too much for her and attempting to maintain control by increasing the throttle resulted in a hefty torque roll towards the ground. Landing on idle power and she was light as a feather touching down.

Another 2 more successful, although untidy flights in the wind and I decided to put her away and save her for some calm summer evening flying. Looking forward to flying her on the trims and just sitting back, watching her go.

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Old Geezer17/05/2018 01:23:28
510 forum posts

All my pictures are taken with an iPad or an iPhone, stored on them (both) and iCloud. How can I convert these to the jpg format that you require for downloading onto the site?

Thanks - Gurth.

Ron Gray17/05/2018 07:49:07
924 forum posts
231 photos

They will upload fine as they are. All of mine are taken using my iPhone.

Old Geezer18/05/2018 02:09:35
510 forum posts

Thanks Ron - but I'm completely ignorant as to how I go about uploading - and any results from a Google search are pretty unhelpful as they all seem to assume a lot of basic knowledge. I really need a step1, step 2, step 3 / join part a to part b type instructions - don't need to know how it works - just how to do it! Any help of that sort will be muchly appreciated. Cheers Ron - Gurth.

onetenor18/05/2018 06:50:37
1718 forum posts

Re the St 3250 not running Check or replace the plug and clean out the carb jet holes etc. and make sure batteries are charged and connections are good.

Ron Gray18/05/2018 07:37:09
924 forum posts
231 photos

@ Old Geezer - have you looked at this thread **LINK**

Ron Gray18/05/2018 07:48:16
924 forum posts
231 photos

I posted these in the ‘Powered by Laser’ thread, should have put them here as well, a Great Planes U Can Do powered by a Laser 80:

fullsizeoutput_126e.jpeg

img_3319.jpg

Martyn K18/05/2018 09:11:28
avatar
4612 forum posts
3227 photos
Posted by Martian on 08/05/2018 20:18:22:

my recently completed Spitfire

img_20180506_143449_burst_02.jpg

img_20180506_143540_hdr.jpg

That's nice Martian. How big and is it a kit, artf. plan and how big?

Nigel R18/05/2018 09:47:09
avatar
1413 forum posts
309 photos

Martyn

Martian's Spit is (I would guess) a Warbird Replicas:

http://www.modelflying.co.uk/forums/postings.asp?th=132160

Old Geezer18/05/2018 10:52:34
510 forum posts

Precisely what I was after Ron - many thanks. Gurth.

Manish Chandrayan18/05/2018 12:08:43
452 forum posts
56 photos
Ron, is that a 40 or 60 U can do ?
Ron Gray18/05/2018 13:24:10
924 forum posts
231 photos

Hi Manish, here are the specs:

Wingspan
65 in (1650 mm)
Wing Area
1072 in² (69 dm²
Weight
7-7.3 lb (3.18-3.35 kg)
Wing Loading
15-15.9 oz/ft² (46-48 g/dm²
Length
69.5 in (1765 mm)
Engine Required
2-stroke .61-.91 cu in or 4-stroke .70-.91 cu in

Edited By Ron Gray on 18/05/2018 13:24:45

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