Timo Starkloff Posted January 2, 2021 Share Posted January 2, 2021 Second lockdown in Germany, a few free days at Christmas and the first time in the workshop since many months - I just had to have a quick build of a new model for 2021. Beneath preparing 1/12 drawings for the classic Bf 109 for FMT magazine including the H "Hoehenjaeger" version, I found out about some more exotic Messerschmitt projects. And beneath the chance to get small electric glider for daily flying, there's the possibility for an unusual warbird for formation flights with other 1/12 scale aircombat models. The P.1091 was one of many German WWII projects that never got realized. Further development at Blohm&Voss lead to the Bv 155 and finally a flying example. But the need for an extreme high altitude fighter never materialised. Allied bombers flew below the projected height of around 12-15.000 meters. There's an interesting book, well researched and with many details including the P.1091. Timo Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 Then came the request from Martin and a short discussion, preparation of the 1091 plans for him for PSS and everything was in place to have a built on my own. With many tools and materials still at unknown places due to moving last summer, it's also a good project because it's a simple plane and not much is needed. 50% of the parts are the same as for my 109 and 90% of building is identical, just a few ribs more to glue. First task as always is to produce a kit with all the parts, cut out by hand with saw and cutter. I use paper templates for balsa parts. The template for the 1.5mm balsa wing skin is especially useful because it's also needed to mark rib and spar positions. Length comparison of 109 and 1091 fuselage template is impressive. Timo Edited By Timo Starkloff on 02/01/2021 20:23:07 Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 Balsa spar and ribs are glued to the lower wing skin, fuselage sides are reinforced with balsa. Fuselage end is sanded. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 Fuselage sides are glued together at the end and the central frames, as symmetrical and straight as possible. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 Frames are always tested dry without glue first, but due to the experience with the standard 109 everything fits together fine. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 Adding fuselage planking. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 For correct washout, a thin piece of balsa is put below the wing. Outer wing panels are glued to the center with much wood glue. Edited By Timo Starkloff on 02/01/2021 20:30:34 Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 Accumulator and motor hatch is made from thick balsa to be sanded in proper shape, hollowed out on the inside. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 Inbetween check for weight is good with just 310 grams. Quote Link to comment Share on other sites More sharing options...
Martin Gay Posted January 2, 2021 Share Posted January 2, 2021 Hello Timo, I am following this thread. I like the slot in the fuselage sides for the fuselage formers! Looking forward to building a PSS version. Regards, Martin. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 And very important, checking the optics of the complete model The looks are quite unusual. Weight will be low, there's a long fuselage and a wing with a ratio of 1/10, airfoil is AG35 for my model to be able to soar in thermals (SD6060 for the PSS version). What can go wrong? The tail is much increased in size bit still small. Hopefully vertical stabiliser size is enough and center of gravity is on the correct point for the first flights. A wing with a balsa spar is easy to build and the wing loading will be low, but if it's strong enough for all flying conditions will be interesting, too. A small 180 Watt brushless motor, 20A ESC and 3S1300-1700 is planned for this model to keep weight low. Standard 109 with 85 cm wing span is possible with around 600 grams, so 800-900 grams should be possible for the P.1091 with 177 cm wing span and a length of 111 cm. First flights are always interesting and this model will be no different, Timo Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 Hello Martin! I cut the parts last weekend and started building on Monday, nearly finished already Maybe the wing spar of the PSS model should be doubled in size in the middle of the center wing or tapered, Martin. Low weight at the wing tips is important for good flying characteristics of all models. But with no motor/accumulator the PSS version should be fine with some reinforcements, depending on slope and wind conditions at hand. Timo Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 2, 2021 Share Posted January 2, 2021 Nice Timo, I've never heard of it. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 2, 2021 Author Share Posted January 2, 2021 I heard about that particular model only a year ago, John. But until reading the Bv155 book I never realised how much energy went into this high altitude project by Messerschmitt and Blohm & Voss. A complete waste of time. German fighters were competitive with Allied models but the lack of proper training seemed to be the biggest factor of loosing the air war, a factor which wasn't realised by German leaders. https://airandspace.si.edu/collection-objects/blohm--voss-bv-155-v2/blohm--voss-bv-155-v2 https://www.secretprojects.co.uk/threads/secret-projects-of-the-luftwaffe-blohm-voss-bv-155-by-dan-sharp.32684/ Good result for us modellers is a big variety of types. The closest in size and shape would be the Westland Welkin, another exciting looking aeroplane Timo Edited By Timo Starkloff on 02/01/2021 20:57:42 Edited By Timo Starkloff on 02/01/2021 21:01:23 Edited By Timo Starkloff on 02/01/2021 21:02:23 Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 3, 2021 Author Share Posted January 3, 2021 I always thought about building a 1/12 Vickers Wellesley for the purpose of PSS, soaring and aircombat fun flying. But the advantage of the 1091 with using spinner, canopy and so many other parts from the standard 109 is too tempting. And then it is a widley unknown aeroplane. Further detail work on reinforcing the tail (the weak point of the 109, not only because of flying characteristics) and preparing the cowling and motor mount. The cockpit gets a few details more than my contest models. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 3, 2021 Author Share Posted January 3, 2021 And another check of the appearance. From a certain angle it looks fine, from other views... well it is how it is. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 6, 2021 Author Share Posted January 6, 2021 Adjusting wing to fuselage is always difficult, especially with a long wing. It never seems right. Edited By Timo Starkloff on 06/01/2021 16:19:12 Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 6, 2021 Author Share Posted January 6, 2021 Aileron end is glued to the wing, aileron itself cutout later. It is a good reference for a pre-flight check if ailerons are straight. The other reason is the idea to prevent an early stall at the tip through aileron movements, but from experience with my standard 109s with different aileron shapes, there's no difference. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 6, 2021 Author Share Posted January 6, 2021 Center hole is for wing wiring. Reinforcement for the screw is on both sides of the wing. Edited By Timo Starkloff on 06/01/2021 16:22:40 Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 6, 2021 Author Share Posted January 6, 2021 Then there#s the elevator. In contrast to the aircombat 109 and my previous plans, I'll try to keep the hole in rudder as small as possible. Left and right of elevator are joined by hard wood, the I apply the cutout for rudder movement. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 6, 2021 Author Share Posted January 6, 2021 More work also done on the nose. Two hatches this time, one for the motor and the other for the accumulator. The Japanese saw was a present from a friend and is one of the best tools I have. Edited By Timo Starkloff on 06/01/2021 16:25:58 Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 8, 2021 Author Share Posted January 8, 2021 Holidays over and building slows down. But yesterday I received Oracover and servos, so there's something to do on the coming weekend. But there was time to work on CAD for an update for the plan so Martin has less trouble with non fitting parts when building the PSS version. Timo Edited By Timo Starkloff on 08/01/2021 16:23:59 Edited By Timo Starkloff on 08/01/2021 16:27:48 Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted January 8, 2021 Author Share Posted January 8, 2021 The question remains to build Stufe II or III version. I would prefer the last one, but for gliding I would have to attach the radiators and air scoops with magnets for quick detachment. The colours will be partly camouflage, partly metal and British markings. Similar to the different unfinished projects at the end of war which were test flown in Britain or America. In fact, the Bv 155, successor of the 1091, was presented in Britain to the public and is in America today, waiting for restauration. Timo Quote Link to comment Share on other sites More sharing options...
Tim Flyer Posted January 9, 2021 Share Posted January 9, 2021 Wow great work and an amazing WW2 plane. The design seems quite ahead of its time. Reminds me of the US U2 spy plane. Quote Link to comment Share on other sites More sharing options...
perttime Posted January 10, 2021 Share Posted January 10, 2021 I was browsing the Secret Projects Forum, and came across some Bf 209 designs or proposals. Not the small speed record 209 but what mainly look like enlarged Bf 109 with various engines: **LINK** For example: Quote Link to comment Share on other sites More sharing options...
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