jacktores69 Show full post »
jacktores69
Thanks for the tip! I’ll use that next time I build something like that, that big. Anyways, I did scrap that plane and built a new one, kind of the same shape but with my fish style wing for stability, the back is designed different to. I think this one should do good. Let me
know what you think. 
IYAOYAS
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mastermalpass086
Ah yes, you've got it looking like a trainer, that one should be a breeze to fly! 🙂
BRB - Building another nosecone.
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bogusbandit56
jacktores69 wrote:
Thanks for the tip! I’ll use that next time I build something like that, that big. Anyways, I did scrap that plane and built a new one, kind of the same shape but with my fish style wing for stability, the back is designed different to. I think this one should do good. Let me
know what you think. 


I agree with MM, I don`t know about a breeze, but you should have more success than the anhedral model.
Wot, no Depron?
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jacktores69
thanks, will update.
IYAOYAS
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JTiger
Another thing that might help would be to move the main wing forward and increase the size of the horizontal stabilizer. It might also help if you moved the horizontal stabilizer up; right now I think the turbulence from the wing would really reduce the effectiveness of your elevators.

EDIT: whoops, didn't even notice the new model when I posted this.
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jacktores69
Took it for a test flight and it flew really well for the first time👍🏾. Since the shape of the front is angled down it caused a bit downward pull so I had to pull back on the stick a bit to keep the nose up. Other than that it was a successfully flight. I will fly it tomorrow and put up some videos, it was too dark to get it tonight. Love this scratch building!!
IYAOYAS
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jacktores69
thanks, will update.
IYAOYAS
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jacktores69
he fist flight was a good one, it flew great. I had a couple of hick ups but no big deal, couple of fixes here and there will due the trick. I will post some videos next.
IYAOYAS
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solentlife
Actually if you look at all Soviet era planes ... Iluyshin .. Antonov ... for commercial use - you will see a proliferation of Anhedral regardless of size and intended use. It was literally their 'trademark'.

If you come into the west ... odd fighter / multi-role designs have used a variation where wing tips are angled down ... TSR2 for example.

I live and work with Russians and what I hear from ex Military guys - is a possible reason for Soviet use of such - may have been due to construction and material limitations. We are talking relatively early days and alloys were not as tolerant of flexing as todays variants. Sit on an Airbus or later Boeinmg and watch that wing bend upwards as the plane gains lift to take-off. A way of countering in early days would be to have the wing at rest angled down. As the wing bends with increasing lift force - it compresses the spars etc. giving increased resistance and strength to that structure.

The Soviets were careful not to publicise the air accident records ... but during those days Aeroflot for example had one of the worst records of all national carriers. (My Father was Senior Flight Ops and Safety for UK CAA ... was involved in not only development of Concorde, Trans Polar Flights - but also in Accident Investigation). I can remember as a child his talking about Russian incidents.

Sorry to divert ... but on this theme of materials and construction : TU144 has three fundamental flaws that made it impossible to compete with Concorde.

1. The fuselage was more like a 'rolled tube' and suffered stress cracking. Concorde was different in that it could absorb such due to its modular style and also its ability to allow expansion / contraction. The metal used in the TU144 in that fuselage was sadly inferior alloy as well.
2. Engines too close together and they had to fit heat shields to the tail ... this also led to increased problems allied with 1.
3. Until the later K versions - TU144 was unable to sustain Supersonic speed without re-heat.

The TU144 was relegated to primarily mail flights Moscow to Almaty - with TWO aircraft always rolled out for each flight. Its reliabiity was so poor - the second was ready to assume the flight if first failed checks. Senior Govt officials were not allowed to fly as groups on it - in fact top most officials were not allowed to fly on her.
Passengers could only hold shouted conversation due to the noise level inside - another result of the tube construction and engines used. The joke was that hand written notes were the preferred communication !

Sorry to veer of there .. 

Back to Anhedral  ... it was a standard Soviet era style ... 
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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JettaManDan
anhedral (sp?) will always make for a very unstable plane without a lot of electronic help....when i built and flew my colonial viper it was very difficult to keep in stable and level flight. Good luck!
My YouTube Channel - 250+ Video's! http://www.youtube.com/jettamandan09

I'm an R/C Junkie! 40+ planes - 12 Heli's - 6 multirotors - and ground vehicles galore! I've got issues.
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solentlife
JettaManDan wrote:
anhedral (sp?) will always make for a very unstable plane without a lot of electronic help....when i built and flew my colonial viper it was very difficult to keep in stable and level flight. Good luck!


Years ago - I had the Pavel Bosak Mig 15 with 20 Glow up front. Its was a Rud / Ele model and with dihedral ... not a lot but enough to turn etc. It crashed one day at a show we were at and the spar sheered at centre. In those days ZAP or Satelite City was the usual CA and only from Hobby Shops ... So I cut in .. Zapped it and left to cure. Hour later - I noticed it had anhedral now !! I didn't fly it again that day - it was a show and just to to be safe.

Few days later at club field - I thought - why not ... lets see what difference. Honest - it flew better !! 

Reminds me - with todays EDF's / E-Power and smaller better servos - that model would be good to build again with Ailerons. Maybe just transpose to foam as is.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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