Planes > Scale
Airco DH2
Happy Days:
Very intricate work you’ve done there John. :clap: You certainly have more patience than me!
Ah!. So the gearing is 7:1.…..Let’s see what that means:
Voltage 7.4 x 4500Kv = 33300rpm :- 7 = 4757 prop. rpm. I would have thought that was a wee bit slow for a 4inch pitch prop, but as you’ve already ordered the parts see how you go. My guess would be that you’ll need a slightly greater pitch prop. If it does fly with a 7x4 prop you should get a good flight time. (Probably a good 6 minutes)
Just another thought that’s come into my head John, relating to mounting the motor/reduction gear. Maybe you’ve already seen this coming but when you mount the motor I’m thinking that, obviously the output shaft of the reduction gear will have to be in the centre of the fuse, which means the in-runner motor (the heaviest part) will be off centre.
I remember when I had a spell of flying little indoor planes (180grm biplane) I found it most important to have the model laterally balanced. (As with all planes of course but I found it more so with the smaller models.)
Maybe other more experienced flyers of these type of models will know a trick or two but I’d have thought you’ll have to mount the unit so the motor is above or below the output shaft. If the motor is to one side then I’d imagine you’ll have to add weight to counter that of the motor.
As for the voltage regulator, no you wont need it for this model. You’ll find the esc has a plug on it that fits into your rx. (Throttle position.) As soon as you connect the battery to the esc the rx will power up. :D
The voltage regulator could come in handy though, in your gliders! :shock: If you wanted to use a 2 cell Li-Po instead of a metal Hydride battery because Li-po’s are lighter and hold more current 8) )
Keep up the good work John, & good luck.
Good heavens, look at the time. I’m off to bed to cuddle my teddy. :oops:
Keith
johnfireball:
Hi all,
I'm back to bore you all again. Thanks again to keith for electric advice, I believe the motor will fit in symetrically so hopefully no problem there. You could well be right about prop pitch. This is a beautiful little kit, it's my first laser cut build all others I have done were from paper plan only (what a difference in accuracy), however it's not for the novice the instructions are nonexistant and a good knowledge of build techniques and plan + parts studying is required or you will end up making a major cock up. The wood used is strong but heavy and I fear the final weight may be more than I anticipated.
Anyway some photos of wing build showing modification for ailerons and dihedral setting. I plan on covering the wings in one go using the covering material as a hinge so note the angle of the aileron leading edge to allow down throw.
As an aside John from up north I notice from a photo in your workshop a tigermoth GAYIT, I flew in this plane in the seventies, loops, spins, etc at a gliding event in Kilkenny. It was a friend of the Dads Jeremy Bryson who piloted. We wore leather caps and all the gear, a memory I will cherish.
John.
JohnPearson:
Hi John
Well impressed, looks great!
johnfireball:
Hi all,
A little more progress made and experimented with a different covering film. I found a discussion group on the net and the idea looked good.
http://www.rcgroups.com/forums/showthread.php?t=274520
So I got hold of a roll of this stuff and I can honestly say I am a convert. It's very light preglued and quite easy to use,I covered this wing in one piece for top and one for the bottom. Available in 3 thicknesses (30 micron, 42 micron and 70 micron) and either matt or gloss finish only disadvantage is transparent only so needs to be painted. I opted for matt finish as I think it takes paint better. The water based paints that the warhammer shop sells take very well and can be airbrushed.
A few pics of covering procedure
Lay covering over frame on flat surface
Tack the edges down with the iron set on silk, Dont need to be too fussy.
Retack all edges with iron set to wool and be sure they are well stuckand then shrink all over on wool setting .
Finished wing (not one wrinkle) with 200 meter roll of covering film, a lifetimes supply. The roll cost approx €50.00
If anyone wants to try some let me know, you wont be disappointed.
John.
JohnPearson:
Hi john, great idea and cheap too! would it work on foam I wonder. John I would like to give it a try. I found a place in England that supplys the film, however if there is a company local, I would try them.
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