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Post by chamm37 on May 11, 2008 22:20:59 GMT 10
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Post by felix on May 11, 2008 22:48:09 GMT 10
hey well done buddy,i started like most by modyfying all types of unlikely planes at bout your age.lucky for you you have one advantage that i didn't and that's access to plenty of advice.with a bit more work there's no reason why it won't fly well for you.
couple of suggestions though:
remove those fins on your tips and make the fin in the centre a fair bit bigger (about 3 times the size should do).those fins on your tips are ahead of your balance point so they will make it more unstable in yaw (side to side) and because your design has no sweep it will need a big fin out the back.
also make sure you have the least amount of control movement you can get (they are some big elevons there).
also what you might want to do is measure a point from the leading edge that is 30% of your wing width get it to balance on your finger tips there by adding wieght to the nose and then test fly it (you will need a fair bit of up elevator).
do all that and you may just have a good little light wind flyer.
good luck mate.
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Post by chamm37 on May 12, 2008 0:32:22 GMT 10
yer well this is made from a 3D aerobatic plane that i had so that is y it has got big ass allerions.......i am thinking of gluing them down and decressing them buy about half the distance....wat ya think....and thanks for those tips and i am going to have to get some coroplast or something for the verticle fin.....i am sure i will find a house sign somewhere....hahahahahahahaha...do u no of somewhere i can find some of that stuff from mate..thanks again
Regards,
Chris ;D
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Post by chamm37 on May 12, 2008 19:20:31 GMT 10
i have now made some big changes to it and have taken your advice felix.........i have taken the 2 side fins off and have now made a bigger single fin for the middle out of coroflute.......i will post some pics on soon when i can get some batteries for my camera....thanks again felix
anyone else want to help....be all means and throw in some suggestions and stuff ae ;D ;D ;D
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Post by Pij on May 12, 2008 19:36:32 GMT 10
Okay, I'll throw a suggestion. Just promise you won't take too much notice of me - I'm a beginner.
My suggestion is: Don't reduce those nice big elevons. You'll need them to give you the reflex your tail-less glider needs. It's smoother on the airflow to deflect a large surface a small angle, than a smaller elevon a large angle. Just make sure you set it up for VERY SMALL throws after finding an initial stable glide position.
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Post by chamm37 on May 12, 2008 20:27:12 GMT 10
yer no i was thinking that myself ae......thanks for the suggestion ae but yer no it flys really really well just throughing it around the joint with no wind....the big test will be on the weekend....hopefully i will be able to get it in the at SC this weekend ;D ;D ;D any other suggestions that might be helpfull....plz leave them  |
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Post by felix on May 13, 2008 17:18:12 GMT 10
hey chamm another idea on pij's......set those large elevons to give you the ideal reflex (this is up elevator to give the wing stability in pitch).you should be able to get a nice stable glide but i've got a feeling that wing will need to be fairly nose heavy with a fair bit of reflex to have a chance of flying decent. once you got your angle set so it glides hands off in a nice straight line glue them solid.then cut the last 1/3rd off and make them your elevons.reason i say this is is unless you have the ability to adjust your rates it will be nearly uncontrollable with such huge surfaces.failing that if you find it is too sensitive at minimum rates make yourself some extra long control horns.
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Post by felix on May 13, 2008 18:25:15 GMT 10
btw coroplast is a little tricky to find and there is not a supplier that i know of in caboolture.you could try caboolture signs that is along beerburrum road (past the rsl but before noyz honda -pretty much on the railway tracks there).although for sale signs are an option and easy to "borrow".the other material that is better unless combatting is balsa,can get that cheap at the toyworld in moronfield.another thing to consider is taping your leading edge.that foam is likely to be very fragile and you'll need the nose wieght anyway.
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Post by callun on May 17, 2008 21:23:16 GMT 10
You can buy coreflute sheets (which I believe is the same as coroplast?) at the Bunnings in Stafford. I'm sure there'd be similar in Bunnings near you.
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Post by felix on May 17, 2008 21:44:53 GMT 10
never knew they sold it at bunnings,will have to drop in there.
there is a bunnings on morayfield rd in morayfield.nice and close to you.
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Post by chamm37 on May 18, 2008 16:45:00 GMT 10
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Post by felix on May 18, 2008 18:05:51 GMT 10
hey that is starting look like it may just fly well now bud,well done.
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Post by chamm37 on May 18, 2008 22:56:16 GMT 10
yer thanks well i hope it flys well...... Me and this other guy that is in New Zealnd are working on it...he is going to cut it out for me on his cutting machine and stuff like that for me and then send it to me to build... it is very similar but i have made some additional changes to it.. there is a slight degree angle in the back where the allerions are and is solis at the back....it is going to have the carbon fibre set up as the reaper and is going to be 1200mm in lenght with the widest part of the plane being 225mm in width....so yer it is all coming into plan.... i hope it goes all smoothly and if it flys well i might just have to see if anyone will buy any....we will see how it all plays out i guess |
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Post by chamm37 on May 19, 2008 22:09:21 GMT 10
to get this plane built for me it is going to cost me $151 New Zealand money so just under $123 Australian......that is including freight and to be cut with the spars allready cut out and comes with them allso......i reakon it is a steal myself........if it flys well, anyone interested of purchasing one....... |
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Post by Pij on May 19, 2008 22:20:29 GMT 10
Are you going to make sure the prototype flies right before investing all that money in the cores to be cut? Also, there are Aussie foam cutters who could do it for you, maybe somebody close to where you live.
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