|
|
my axn floater |
Post Reply 
|
Page <1 345 |
| Author | |
Sawdust 
Platinum (AU) USERID: 628468 Hobbyking Addict 
Joined: 07/Oct/2010 Location: Parkes NSW Au Online Status: Offline Posts: 3138 |
 Quote Reply
 Posted: 31/Dec/2011 at 9:57am |
|
Hey thanks Sooty, excelent suggestion
 . I'll definately remember that for next time, and there almost certainly will be one.
I checked the plane out a short while ago. When I plugged the battery in it made it's usual happy noises, aelerons responded normaly, rudder also and the motor too but the elevator went to full up all on it's own and made some funny twitches but wouldn't realy respond to control inputs. Just to be sure it wasn't in the receiver I plugged the aelerons into the elevator output and they worked fine so it looks like it's cost me one of those ultra expensive hxt900 servos. The water level inside the fuse would have been over the top of it and the rudder servo so I count myself lucky the rudder one seems fine and both speedy and 4 chanel FrSky receiver all survived. |
|
|
I'm never wrong, once I thought I was but I was mistaken. |
|
 |
|
|
youngatheart
Platinum (AU) USERID: 997510 Bargain Addict! 
Joined: 18/Dec/2011 Location: Perth, WA. Online Status: Offline Posts: 32 |
Quote Reply
Posted: 31/Dec/2011 at 11:05am |
|
Sawdust, Its been 38 degree plus over here and windy for dayts on end. So we have been waiting for the wind to ease. The day came, my 15 yo put his blue angle in air maiden flight - what a little ripper. The wind got it and he landed it over trees in an adjacent park without much visual - unbeleivable ! no dameage upright - my 14 yo old caught the event on his phone camera. Then he went to land with full visuals and he bent the nose landing wheel against hull. Is snapped when we got home so it was dad off to the workshop to manufacture a new landing and steering mechanism. its flying again. The ANX, went to fly and no matter what we did TX/RC would not talk - after getting home and hours trying to figure what was wrong opened the back up of TX and found one of the mods i had made was faulty,I had changed the Tx circuit to enable tx to be used in trainer mode - must have been a cold solder and broke when bounced!. all FIXED now (also works in trainer mode - 15 yo training "youngatheart" - and we flew this morning (14yo).Having twisted the the hull back into shape it flew like a dream until the rubber retainer broke and the prop came off. So all good! Thanks everyone for your advice - It all helped to figure the twist in the hull was the problem. A bit of mild heat and brut force and ignorance and its all good. As for using the ANX on the water that will be interesting! You will need heaps of power to break free of the water - landing on the water ought to be interesting as well. Look forward to hearing more about it.
|
|
|
|
|
CaleyD
Platinum (GB) USERID: 589774 HobbyKing aficionado 
Joined: 09/Aug/2010 Location: Scotland Online Status: Offline Posts: 406 |
Quote Reply
Posted: 31/Dec/2011 at 11:40am |
|
Whilst you might think the wider nose would assist, it actually hinders take-off because it increases the "grip" the water has on the plane. What's more, if you think of the bottom of the plane as the hull of a boat, the waterline needs to be below the point where the fuselage starts to narrow (upwards)...or you get the reverse effect that you are seeing, which is to drag the nose under.
You can overcome that in one of three ways (most likely a combination)...... Additional lift - possibly using some flaps to generate more at lower speeds. Raising the plane further out of the water - adding foam to the underside of the fuselage to increase the depth of the hull and increase buoyancy would be one way. Reshaping the sides of the fuselage - raise the lip and stop water running over it to the point where it is acting against the lift. Water is about 1000 times denser than air (close enough for our discussions), so it would take a lot more lift from the wing to overcome the submarining effect you are witnessing. With that in mind, I would keep the "increased lift" option as something for overcoming surface tension and getting the lift at lower speeds. To prevent the submarining, you need to look at deepening the fuselage (hull) and/or reshaping it on the sides. There are those far better placed than me to help you in regards to what exactly that reshaping should entail, so hopefully they will chime in with some assistance on that front. |
|
|
|
|
Sawdust
Platinum (AU) USERID: 628468 Hobbyking Addict
Joined: 07/Oct/2010 Location: Parkes NSW Au Online Status: Offline Posts: 3138 |
Quote Reply
Posted: 31/Dec/2011 at 5:03pm |
|
Yougatheart. Glad to hear you got it worked out and flying the way it should be
Caley. Thanks for the helpful advice, I do apreciate it. I don't want to permanently modify the plane since it's only a bit of a fun experiment and very soon there wont be any water to take off from anyway. You have started me thinking along a slightly diffferent track though. I was thinking of more or a pair of cigar shaped lengths of eps on either side at the front, now I'm thinking more along the lines of a block of eps shaped a bit more boat hull like and carved out on the inside to fit the nose of the plane into. Still mulling it all over and there's only 1 guarantied result, it's going to look like something doctor Frankenstein helped on  .
|
|
|
I'm never wrong, once I thought I was but I was mistaken. |
|
|
|
|
Sawdust
Platinum (AU) USERID: 628468 Hobbyking Addict
Joined: 07/Oct/2010 Location: Parkes NSW Au Online Status: Offline Posts: 3138 |
Quote Reply
Posted: 02/Jan/2012 at 4:55pm |
|
Good news everybody! New hxt900 elevator servo installed, pretty hot here at 35c today but took the floater out for a run, after a bit of retrimming and playing about doing silly stuff decided being tied with that other bloke with his easystar at 5 loops unpowered while descending just was absolutely not acceptable. The clearly vastly superior floater jet had to be proven a clear winner, sooooo I had another crack at it. This time I got NINE loops out of it on the way down, I'm pretty sure I'd be able to fairly easily beat that too if I bothered to work out how to set the brake on the speedy too so that spinning prop wasn't slowing it down so much every time it was diving. I nearly lost the plane because I was too focused on getting the loops and not on where the plane was headed and by the time it was getting close to the ground and time to fly back the little 4 chanel park flyer type receiver was only responding intermitantly. I don't care though, even if it had cost me the model it would have been totaly worth it to beat the other bugger by a full 4 loops
 .
We are good friends by the way, it's just that it's unacceptable that he beats me at anything .
|
|
|
I'm never wrong, once I thought I was but I was mistaken. |
|
|
|
|
Bootstrapper
Platinum (AU) USERID: 1201486 Newbie 
Joined: 28/Nov/2011 Online Status: Offline Posts: 1 |
Quote Reply
Posted: 06/Feb/2012 at 2:00pm |
All sea/float planes have a step cut into the underside of the hull/floats. You might like to consider modifying the AXN's fuselage appropriately. If buoyancy is a problem perhaps adding a layer of foam to the underside of the fuselage, back to the CG point. That way. you get extra flotation and a step, all in one. |
|
|
|
|
elolz_Au
Platinum (AU) USERID: 1287956 Bargain Addict!
Joined: 17/Jan/2012 Online Status: Offline Posts: 83 |
Quote Reply
Posted: 14/May/2012 at 6:52pm |
so true lol |
|
|
|
|
Post Reply
|
Page <1 345 |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options
.
Why the heck not give a water takeoff a try! ...