Goose's H9 F4U Corsair ARF bash
05-25-2010, 09:16 PM
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RE: Goose's H9 F4U Corsair ARF bash
Hey Joe...
Have to agree, he did an awesome job!
Weight... hmmm... [sm=cry_smile.gif] right now I am guesstimating it will be around 12lbs all up, maybe even a little more although I am being super careful with adding any weight.
The motor is an Axi 4130-16 and comes in at a whopping 452g as per the pic.
Cheers
Goose
Have to agree, he did an awesome job!
Weight... hmmm... [sm=cry_smile.gif] right now I am guesstimating it will be around 12lbs all up, maybe even a little more although I am being super careful with adding any weight.
The motor is an Axi 4130-16 and comes in at a whopping 452g as per the pic.
Cheers
Goose
05-26-2010, 07:51 AM
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RE: Goose's H9 F4U Corsair ARF bash
Guys, this is a great thread. My H9 corsair is a basic e-conversion so far. One of the issues I have is the motor thrust angle, I have installed the motor mount to introduce down & right, but it appears to be insufficient. Last weeks maiden was a handfull, my heart was in my ***** for the whole flight, she kept nosing up whenever I applied power.....
Managed to get her back on the ground in one piece and to add insult to injury the gear collapsed!! Still had to do the walk of shame. :-(
When I took the cowl off Inoticed the firewall was slanted where it almost looks like the the top is further back than the bottom, making the motor appear to point up? How are you making sure you get down-right, thrust, how many degrees & relative to what line on the fuse?
Thanx.
Managed to get her back on the ground in one piece and to add insult to injury the gear collapsed!! Still had to do the walk of shame. :-(
When I took the cowl off Inoticed the firewall was slanted where it almost looks like the the top is further back than the bottom, making the motor appear to point up? How are you making sure you get down-right, thrust, how many degrees & relative to what line on the fuse?
Thanx.
06-04-2010, 08:04 AM
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RE: Goose's H9 F4U Corsair ARF bash
Gidday Dangaras...
Congrats on getting your bird back in one piece! Sounds like it was a real handful.
If you are using stock gear, you will have then collapse many times my friend... replacement is the only solution.
The firewall is supposed to have a right and down offset to counter engine torque. I don't the angle specifically, but both of my H9's were ok.
I will check mine out as it will be easier with no motor installed yet and let you know.
Cheers
Goose
Congrats on getting your bird back in one piece! Sounds like it was a real handful.
If you are using stock gear, you will have then collapse many times my friend... replacement is the only solution.
The firewall is supposed to have a right and down offset to counter engine torque. I don't the angle specifically, but both of my H9's were ok.
I will check mine out as it will be easier with no motor installed yet and let you know.
Cheers
Goose
06-04-2010, 02:16 PM
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RE: Goose's H9 F4U Corsair ARF bash
Goose,
I reworked the thrust angle, 5 down, 4 left. Screwed with the retracts for 45 minutes before Igot a solid down & locked condition. Retracted position is pitiful with half the wheels still exposed.
Took her out for the second maiden, throws were adjusted and I found her more managable. Ichanged the prop from MA 3-blade 16x8 to a 3- 14x9, no real performance diff as Iwas taking it easy. The throws were still too high for my liking, but Iwas doing ok and the "quaking in my boots" was subsiding.
I practised 2 approaches and go arounds and was planning a landing on the 3rd when Iwas a bit long and decided to go around. Well that was a mistake! On applying throttle the Turnighy 50-55 screeched like the rotor was blocked or slipping and at 6 feet up, she left wing tip stalled and smacked the ground. Ahhh!!!
The wing was cracked in and around the retract location and at the inner edge. Istripped the cover and am busy wood gluing the cracked ribs and adding support braces. The left wheel collapsed, but with that hit Icould expect no less, it broke a blade, cracked the cowl a little (easy to fix & paint touch up) and pushed the horizontal stab loose (epoxy fix)..
Ithink Iwill kick myself later, but right now Iam going to drop my throws more to decrease my sensitivity even more.
If you can let me know what and how to measure the thrust angles that would be great.
Thanx.
I reworked the thrust angle, 5 down, 4 left. Screwed with the retracts for 45 minutes before Igot a solid down & locked condition. Retracted position is pitiful with half the wheels still exposed.
Took her out for the second maiden, throws were adjusted and I found her more managable. Ichanged the prop from MA 3-blade 16x8 to a 3- 14x9, no real performance diff as Iwas taking it easy. The throws were still too high for my liking, but Iwas doing ok and the "quaking in my boots" was subsiding.
I practised 2 approaches and go arounds and was planning a landing on the 3rd when Iwas a bit long and decided to go around. Well that was a mistake! On applying throttle the Turnighy 50-55 screeched like the rotor was blocked or slipping and at 6 feet up, she left wing tip stalled and smacked the ground. Ahhh!!!
The wing was cracked in and around the retract location and at the inner edge. Istripped the cover and am busy wood gluing the cracked ribs and adding support braces. The left wheel collapsed, but with that hit Icould expect no less, it broke a blade, cracked the cowl a little (easy to fix & paint touch up) and pushed the horizontal stab loose (epoxy fix)..
Ithink Iwill kick myself later, but right now Iam going to drop my throws more to decrease my sensitivity even more.
If you can let me know what and how to measure the thrust angles that would be great.
Thanx.
06-07-2010, 06:32 AM
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RE: Goose's H9 F4U Corsair ARF bash
Gidday Dangaras...
And so begins your journey of discovery with the H9
Yes, the wheels do not fully retract into the wells. I have CJ gear in mine and have had to change the angle of the mounting blocks, squeeze the scissor links shut, buy the skinniest wheels I can find that don't suck and grind my axle and retaining collars down to nothing and there is still 1-2mm sticking out.
What was that noise?? Did the prop retainer let go?
Ah, too bad about the resulting 'arrival'... but it sounds like you are well on your way to repairing her... just call it battle damage
Regarding throws, I set mine as per the manual which if you look at it is very small plus I flew it with 20% expo. I put the rudder high rates on a switch for takeoffs (absolutely needed) and mixed in a little elevator when the landing gear went down. Flew like a tiger, landed like a kitten.
You would think with all the rain this weekend I would have remembered to measure those angles for you, but I forgot. Sorry. I will look at them tonight.
Cheers
Goose
And so begins your journey of discovery with the H9
Yes, the wheels do not fully retract into the wells. I have CJ gear in mine and have had to change the angle of the mounting blocks, squeeze the scissor links shut, buy the skinniest wheels I can find that don't suck and grind my axle and retaining collars down to nothing and there is still 1-2mm sticking out.
What was that noise?? Did the prop retainer let go?
Ah, too bad about the resulting 'arrival'... but it sounds like you are well on your way to repairing her... just call it battle damage
Regarding throws, I set mine as per the manual which if you look at it is very small plus I flew it with 20% expo. I put the rudder high rates on a switch for takeoffs (absolutely needed) and mixed in a little elevator when the landing gear went down. Flew like a tiger, landed like a kitten.
You would think with all the rain this weekend I would have remembered to measure those angles for you, but I forgot. Sorry. I will look at them tonight.
Cheers
Goose
06-07-2010, 06:47 AM
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RE: Goose's H9 F4U Corsair ARF bash
Gidday guys...
As per the previous post, it rained here most of the weekend effectively cancelling the club Ed Rae Memorial Fun Fly but did allow me some workshop time. It was kinda lucky because the carbon landing gear for the Ultimate didn't show up this week as expected.
Pic 1: The gear door actuator and mounting blocks are glued in and given a light coat of zinc chromate green.
Pic 2: A little more of the air system is installed allowing 2 quick connectors to pneumatically connect the wings to the fuselage.
Pic 3: The door links got smaller and smaller to the point where they work... very fiddly.
Pic 4: This is a dry fit of the gear and doors only thing missing is the spring that holds the actuator bar up.
Pic 5: And finally with the front door taped in place. I am still figuring out how to mount this.
Maybe thats why I couldn't sleep last night *lol*
Still moving ahead.
Cheers
Goose
As per the previous post, it rained here most of the weekend effectively cancelling the club Ed Rae Memorial Fun Fly but did allow me some workshop time. It was kinda lucky because the carbon landing gear for the Ultimate didn't show up this week as expected.
Pic 1: The gear door actuator and mounting blocks are glued in and given a light coat of zinc chromate green.
Pic 2: A little more of the air system is installed allowing 2 quick connectors to pneumatically connect the wings to the fuselage.
Pic 3: The door links got smaller and smaller to the point where they work... very fiddly.
Pic 4: This is a dry fit of the gear and doors only thing missing is the spring that holds the actuator bar up.
Pic 5: And finally with the front door taped in place. I am still figuring out how to mount this.
Maybe thats why I couldn't sleep last night *lol*
Still moving ahead.
Cheers
Goose
06-07-2010, 08:56 AM
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RE: Goose's H9 F4U Corsair ARF bash
Goose,
When I took a look at the prop, it was still on tight. Now that I think about it, the sound was more akin to the screech heard when a motor is under power and the rotor is blocked. I think my throttle up may have caused the magnetic coupling to slip and the rotor did not spin up in sync essentially as if someone was holding the prop. I tested the motor and it appears fine, for now I hope.
I have to add some final balsa sheeting to close up the wing around the bend. I have soaked a piece of balsa sheet for a few hours and I can't get it to flex enough to bend and stay in position. I may have to borrow a friends clothing steamer & give that a try.
As for the gear, I have done serious mods to the fuse to accommodate a 6 cell battery loaded from the top through a removeable hatch I built which means pneumatics will be extremely difficult. I may have to switch to 2 retract servos, one in each wheel well area.
When you have the oportunity to get the thrust angles, that would be great.
Thanx,
When I took a look at the prop, it was still on tight. Now that I think about it, the sound was more akin to the screech heard when a motor is under power and the rotor is blocked. I think my throttle up may have caused the magnetic coupling to slip and the rotor did not spin up in sync essentially as if someone was holding the prop. I tested the motor and it appears fine, for now I hope.
I have to add some final balsa sheeting to close up the wing around the bend. I have soaked a piece of balsa sheet for a few hours and I can't get it to flex enough to bend and stay in position. I may have to borrow a friends clothing steamer & give that a try.
As for the gear, I have done serious mods to the fuse to accommodate a 6 cell battery loaded from the top through a removeable hatch I built which means pneumatics will be extremely difficult. I may have to switch to 2 retract servos, one in each wheel well area.
When you have the oportunity to get the thrust angles, that would be great.
Thanx,
06-07-2010, 09:09 AM
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RE: Goose's H9 F4U Corsair ARF bash
Hey Dangaras...
Try this, it has worked really well for me:
[ul][*] Cut your balsa piece to slightly bigger than you need.[*] Saturate it in water.[*] Stick it in the microwave on high for 20 seconds[*] Pin it in place or use weights, tape etc
[/ul]
Time in the microwave may vary and don't let your wife catch you
Goose
Try this, it has worked really well for me:
[ul][*] Cut your balsa piece to slightly bigger than you need.[*] Saturate it in water.[*] Stick it in the microwave on high for 20 seconds[*] Pin it in place or use weights, tape etc
[/ul]
Time in the microwave may vary and don't let your wife catch you
Goose
06-07-2010, 09:39 AM
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RE: Goose's H9 F4U Corsair ARF bash
Goose,
excellent. I will try that while the wife is at work. I already killed one microwave experimenting with garlic.....
I will update later.
Thanx.
excellent. I will try that while the wife is at work. I already killed one microwave experimenting with garlic.....
I will update later.
Thanx.
06-07-2010, 10:01 PM
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RE: Goose's H9 F4U Corsair ARF bash
Dangaras...
Interestingly, my first H9 firewall measures 5 degrees right thrust and this one measures 4 deg.
Even more wierd is the 2 degrees of up thrust when measuring the angle between the firewall and top/bottom of the fuselage but I am convinced that the fuselage tapers towards the tail immediately so that could account for the 2 degrees... If I were rebuilding it, I would be inclined to make the downthrust zero.
Cheers
Goose
Interestingly, my first H9 firewall measures 5 degrees right thrust and this one measures 4 deg.
Even more wierd is the 2 degrees of up thrust when measuring the angle between the firewall and top/bottom of the fuselage but I am convinced that the fuselage tapers towards the tail immediately so that could account for the 2 degrees... If I were rebuilding it, I would be inclined to make the downthrust zero.
Cheers
Goose
06-08-2010, 08:12 AM
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RE: Goose's H9 F4U Corsair ARF bash
Goose,
thanks. Ihave got to the point where Ithink Ihave the thrust angles set to where Ineed to work on the control surface throws next. My quick twitch muscle fibres out number my slow slow steady ones, so Ineed lots of expo &use low rates (really low).
Iused the centerline of the top and side of the fuse to determine the thrust angles. Looking at the motor now, the down right looks huge however, my last flight interstingly still experienced the upward zoom whenever I applied throttle quickly. Ichecked again and Ihave 5 down &4 right (I think, or maybe the other way?)...
Have to get her patching tidied up, covered & out for the next flight.
thanks. Ihave got to the point where Ithink Ihave the thrust angles set to where Ineed to work on the control surface throws next. My quick twitch muscle fibres out number my slow slow steady ones, so Ineed lots of expo &use low rates (really low).
Iused the centerline of the top and side of the fuse to determine the thrust angles. Looking at the motor now, the down right looks huge however, my last flight interstingly still experienced the upward zoom whenever I applied throttle quickly. Ichecked again and Ihave 5 down &4 right (I think, or maybe the other way?)...
Have to get her patching tidied up, covered & out for the next flight.
06-08-2010, 08:26 AM
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RE: Goose's H9 F4U Corsair ARF bash
No worries...
Good to hear she is nearly ready to take to the sky again... let us know how it goes.
The climb under power could also be your incidences/CG or combinations thereof. I know when we are trimming the giant scale aerobats (of which I am sure no expert) all these things come into play.
Maybe Scooter will chime in as a giant scale legend.
Cheers
Goose
Good to hear she is nearly ready to take to the sky again... let us know how it goes.
The climb under power could also be your incidences/CG or combinations thereof. I know when we are trimming the giant scale aerobats (of which I am sure no expert) all these things come into play.
Maybe Scooter will chime in as a giant scale legend.
Cheers
Goose
06-11-2010, 07:49 AM
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RE: Goose's H9 F4U Corsair ARF bash
Hey guys...
Here's how I solved the front gear doors.
Pic 1: Aluminium straps secure the door to the strut and still allow it to slide as it retracts.
Pic 2: Retracted.
Pic 3: Extended.
Pic 4: From the side.
All going well, I will be mapping out the panel lines for the wing this weekend... see how we go.
Cheers
Goose
Here's how I solved the front gear doors.
Pic 1: Aluminium straps secure the door to the strut and still allow it to slide as it retracts.
Pic 2: Retracted.
Pic 3: Extended.
Pic 4: From the side.
All going well, I will be mapping out the panel lines for the wing this weekend... see how we go.
Cheers
Goose
06-11-2010, 11:55 AM
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RE: Goose's H9 F4U Corsair ARF bash
Goose,
repairs done, as best as I can do. Covering practice tonight, then for real during rainy weekend...
That is a great solution for the gear cover. Couple of things to consider; metal on metal will eventually bind unless you make a self-dispensing system for som KY, it will lock up on you.
You mihjt consider adding an outward curl to that bracket at the top and bottom where it contacts the strut, then apply some teflon tape to the strut or a half teflon washer on the inside of the bracet to keep a smoooooth, slippery surface always in contact with one of the metal surface.............
repairs done, as best as I can do. Covering practice tonight, then for real during rainy weekend...
That is a great solution for the gear cover. Couple of things to consider; metal on metal will eventually bind unless you make a self-dispensing system for som KY, it will lock up on you.
You mihjt consider adding an outward curl to that bracket at the top and bottom where it contacts the strut, then apply some teflon tape to the strut or a half teflon washer on the inside of the bracet to keep a smoooooth, slippery surface always in contact with one of the metal surface.............
06-11-2010, 01:21 PM
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RE: Goose's H9 F4U Corsair ARF bash
Good to hear mate...
I did consider the metal on metal issue. On the previous version, I used a scrap piece of airline and it worked ok.
Given the metal types are different and the fit is very loose during retraction/extension I think it will be ok, but the proof will be in the long term operation.
I like the idea of the teflon washer and will keep that in mind...
Cheers
Goose
I did consider the metal on metal issue. On the previous version, I used a scrap piece of airline and it worked ok.
Given the metal types are different and the fit is very loose during retraction/extension I think it will be ok, but the proof will be in the long term operation.
I like the idea of the teflon washer and will keep that in mind...
Cheers
Goose
06-13-2010, 10:17 PM
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RE: Goose's H9 F4U Corsair ARF bash
Hi guys...
I got a good chunk of work done on the Corsair on Saturday in the form of chart taping the panel lines onto the wings and adding the fabric covered areas.
A lot of hours shown in a couple of pictures...
Cheers
Goose
I got a good chunk of work done on the Corsair on Saturday in the form of chart taping the panel lines onto the wings and adding the fabric covered areas.
A lot of hours shown in a couple of pictures...
Cheers
Goose
07-18-2010, 09:01 PM
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RE: Goose's H9 F4U Corsair ARF bash
So much for my weekly updates, where did the last month go!??
Finally got my 27% Ultimate in the groove and promptly destroyed it with a snap out of a hover with no height... bugger [:@]
Not sure what's going to happen with my 50cc rig...
Anyways, got some work done on the Corsair:
Pic 1: I designed and built a motor box to put the motor at the right place in relation to the cowl and to house the electronics & speakers for the sound system.
Pic 2: Test fit of said motor box. The sides have 'hooks' & the whole assembly is pushed through slots in the firewall and then down to lock it into place.
Pic 3: A 3mm (1/8th) plywood cowl ring is fitted to the cowl at the right angle (glue drying tonight) to attach the whole assembly without visible screws.
Pic 4: General assembly showing how the motor, speaker(s) and electronics are mounted.
Pic 5: A look through the open speaker hole to see whats going on...
Pic 6: It's such a tight fit in the cowl that I had to knock off the corners... god knows how I am going to fit any kind of dummy engine in there... [sm=confused.gif]
Man, I can't wait to eventually have my CAD/CAM setup working as hand making all these custom parts is labourious and time consuming...
Thanks for watching and I will try to get my shizzle together for more regular updates....
Cheers
Goose
Finally got my 27% Ultimate in the groove and promptly destroyed it with a snap out of a hover with no height... bugger [:@]
Not sure what's going to happen with my 50cc rig...
Anyways, got some work done on the Corsair:
Pic 1: I designed and built a motor box to put the motor at the right place in relation to the cowl and to house the electronics & speakers for the sound system.
Pic 2: Test fit of said motor box. The sides have 'hooks' & the whole assembly is pushed through slots in the firewall and then down to lock it into place.
Pic 3: A 3mm (1/8th) plywood cowl ring is fitted to the cowl at the right angle (glue drying tonight) to attach the whole assembly without visible screws.
Pic 4: General assembly showing how the motor, speaker(s) and electronics are mounted.
Pic 5: A look through the open speaker hole to see whats going on...
Pic 6: It's such a tight fit in the cowl that I had to knock off the corners... god knows how I am going to fit any kind of dummy engine in there... [sm=confused.gif]
Man, I can't wait to eventually have my CAD/CAM setup working as hand making all these custom parts is labourious and time consuming...
Thanks for watching and I will try to get my shizzle together for more regular updates....
Cheers
Goose
07-19-2010, 07:54 PM
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RE: Goose's H9 F4U Corsair ARF bash
Got a little more done...
Pic 1: Funny how it seems like there is tons of room in there when you shoot it with a wide angle lens. Here the cowl is test fit using the 4 screws in the plywood ring you can just see.
Pic 2: The cowl is solid and fits very well albeit a little tight.
I'm happy with the overall fit despite the fact the cowl is the wrong size for the model... I can see why they made it like that though.
Only you purests will know what I'm talking about [sm=bananahead.gif]
The motorbox is glued on and under weight (the only thing that is on this model) for the night.
Cheers
Goose
Pic 1: Funny how it seems like there is tons of room in there when you shoot it with a wide angle lens. Here the cowl is test fit using the 4 screws in the plywood ring you can just see.
Pic 2: The cowl is solid and fits very well albeit a little tight.
I'm happy with the overall fit despite the fact the cowl is the wrong size for the model... I can see why they made it like that though.
Only you purests will know what I'm talking about [sm=bananahead.gif]
The motorbox is glued on and under weight (the only thing that is on this model
) for the night.Cheers
Goose