Dave Cunnington Posted August 15, 2018 Share Posted August 15, 2018 A modicum of progress with my scratch build - I don't know about you guys but I always get a boost from seeing the machine with all the bits positioned in their correct places ! PW/extra slim : The wing was built using a K K Scorpion plan, very very similar. I gave up drawing ribs as seen in my previous post ! Quote Link to comment Share on other sites More sharing options...
extra slim Posted August 15, 2018 Author Share Posted August 15, 2018 looking great Dave, I heard you were thinking of an OS40!!!.. yikes.. mine has a PAW 1.5cc..and about 2oz of lead under the motor to balance, unless you have scaled it up you will be way over the top with that motor buddy.. with a lifting wing like that, you will also need a boot full of downthrust.. keep going mate.. Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted August 15, 2018 Share Posted August 15, 2018 No way slim ! It's being built to PW's sketchings and photos, same size as yours I have an old used OS 25 FP which I am putting in it. At one time I was going to fit ailerons and thought the 25 would be good with weight of extra servo etc, but decided not to go that route........the 25 may be a bit over the top now, but at least I would rather have too much grunt and throttled back, than too little ! Alternatively I also have a used OS 15 FP, which I think may be a little marginal on power so onwards and upwards with the 25 Hoping to meet PW on Sunday at the NATS, will you be there on the Sunday ? Quote Link to comment Share on other sites More sharing options...
Stuphedd Posted August 15, 2018 Share Posted August 15, 2018 Excellent progress That looks really good , The Scorpion wings look as good as the "real thing" if not better ! Extra slim will be on holiday during the NATS , silly boy!! but hopefully I shall be there on Sunday . cheers Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted September 12, 2018 Share Posted September 12, 2018 Now has the OS 25 fitted and the nose etc is starting to take shape Quote Link to comment Share on other sites More sharing options...
Stuphedd Posted September 12, 2018 Share Posted September 12, 2018 Looks pretty good to me DC , nice workmanship . cheers PW Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 12, 2018 Share Posted September 12, 2018 Tis a thing of beauty Dave. Shall we be seeing it one day ? Quote Link to comment Share on other sites More sharing options...
extra slim Posted September 13, 2018 Author Share Posted September 13, 2018 Lovely job Dave, there hasnt been one around for over 65yrs and now there are 2!!.. looks great Quote Link to comment Share on other sites More sharing options...
extra slim Posted October 15, 2018 Author Share Posted October 15, 2018 fabulous day yesterday, and took the opportunity for lots of flights, with the PAW backed off she is lovely, and flies beautifully.. very satisfying. Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted October 15, 2018 Share Posted October 15, 2018 Fantastic ! I'll get back to mine soon Quote Link to comment Share on other sites More sharing options...
Dave Cooper 3 Posted October 16, 2018 Share Posted October 16, 2018 I think the KK "Phantom" and "Phantom Mite" were control-liners if I remember correctly...and, not with much dihedral (if any). Very nice engine /exhaust louvres though - do they do what it says on the tin ? Dave Quote Link to comment Share on other sites More sharing options...
extra slim Posted October 17, 2018 Author Share Posted October 17, 2018 Hi Dave, the louvres are semi effective, there is nowt under the hood to divert all exhaust, so being honest it does tend to exit from many places around the front being diesel, but certainly some does via the louvres.. all adds to the vintage effect.. twas my old fellas design, so I cant take any credit.. the cowl at the front wasnt on the original and he couldnt remember if it ever had one being a knock off free flight engine originally, so he has done quite a nice improvised job.. which is quite rare for him!!. aesthetics arent usually his bad Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted February 17, 2019 Share Posted February 17, 2019 Ok guys, in between trying to learn to fly, rebuilding trainers after unscheduled arrivals, life in general, etc, I've actually made progress ! It was nice out today so I got it out. OS 25 fitted, still needs the magnets to be fitted for the new and different nose cowl, the horns for rudder and elevators, and some decoration/decals Thanks to all the advice and tips from reading this forum I know how I should be doing things - but my 75 year old fingers are still learning ...specifically how to bend the heat shrink covering around double curves....oh and I think maybe a degree in gynecology would help also. Do you think the CofG should be about 1/3 chord ? Rgds DC Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted February 18, 2019 Share Posted February 18, 2019 Decorated Quote Link to comment Share on other sites More sharing options...
Stuphedd Posted February 18, 2019 Share Posted February 18, 2019 Super job DC! Just remember to be very gentle on the throttle lever . What weight did it finish up as ?? I think the pilot makes it .We are probably going to need one !. cheers PW Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted February 18, 2019 Share Posted February 18, 2019 Using some old kitchen scales I reckon 1070 grams, with an empty fuel tank and no Rx battery. Balance looks around 40% like this, the battery will bring it forward a touch, but seems it may need some lead Yes, very gentle throttle and other handling will be done PS my son 3D printed and painted the pilot, it's close enough to scale for me Quote Link to comment Share on other sites More sharing options...
extra slim Posted February 18, 2019 Author Share Posted February 18, 2019 Beautiful Dave.. I think I worked on 30%, but it came out more like 35%.. it flys best at a trundle Dave.. mine has quite a bit of downthrust.. and with the 25 upfront quarter to half throttle is all you need.. full power and it would loop !!.. fantastic job.. stunning little plane... shame we don’t know what it is.. ours is known as the “Billy West”.. after dads uncle who he remembers flying it in 1953.. good luck, I do hope she goes as well as mine.. fingers crossed. I would get it 1/4 throttle and a gentle hand launch.. Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted February 27, 2019 Share Posted February 27, 2019 Just don't ask - but it wasn't me on the sticks - it was a very very brief maiden ! For now you guys still have the only complete and flyable example Lessons learnt and the rebuild will fly better - when I can get round to fixing it Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 27, 2019 Share Posted February 27, 2019 I have only just seen this post Dave, and what a beautiful model. I can sympathise with the pilot when I think of a .25 makes my BiFly aerobatic, and your beauty with its tiny elevator and small rudder, and no ailerons. It is obvious in your write up that this is a radio assisted free flight model. We have two similar lads at my patch, complete with stitched hinged surfaces who have compromised with glow power, increasing the rudder and the elevators share of the original surface area And building two wings, to incorporate ailerons, for a different flying experience. Truely, one of the best models I ever fly, is an upgraded vintage model, with ailerons. The owner still brings the non aileron wing for radio guided flight, and this is all achieved on an OS15 This is a great OP to read Quote Link to comment Share on other sites More sharing options...
Stuphedd Posted February 27, 2019 Share Posted February 27, 2019 A great shame David , get it repaired as quickly as poss . and better luck next time Pete Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted February 27, 2019 Share Posted February 27, 2019 Thanks guys, working on it very soon, with mods - watch this space Rgds DC Quote Link to comment Share on other sites More sharing options...
extra slim Posted February 27, 2019 Author Share Posted February 27, 2019 truly gutted for you Dave... did it get lightly tossed in the air as I mentioned..??.. mine has a 1.5 diesel at a very blurp blurp setting and it flies great... a 25 revving will hurtle it into the air and cause a chaotic few seconds I would imagine.. back in the day these were of course free flight, and would be glide tested etc, and the engine was to just pull it along as opposed to hurtle it airbourne... would be interested to hear how it met the ground?? Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted February 27, 2019 Share Posted February 27, 2019 PM sent Slim, thanks. Check your box. Rgds DC Edited By Dave Cunnington on 27/02/2019 13:25:00 Quote Link to comment Share on other sites More sharing options...
Glider Guider Posted February 28, 2019 Share Posted February 28, 2019 Such a shame Dave i have to to say I thought the fuel tank was a little big? maybe installing a smaller one would help ease up on the weight? im sure you'll have it up again very soon Quote Link to comment Share on other sites More sharing options...
Dave Cunnington Posted March 21, 2019 Share Posted March 21, 2019 Done - for now it will be shelved, version 2 has an OS 10 DC Edited By Dave Cunnington on 21/03/2019 21:20:13 Quote Link to comment Share on other sites More sharing options...
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