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32% Aviatik 30.40

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32% Aviatik 30.40

Old 09-10-2009, 02:58 PM
  #101  
JohnF
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Default RE: 32% Aviatik 30.40

Decided to stick it together and see what she looks like. I hope to stop by the Mercer County club, Warbirds Over Jersey, event next weekend. Should be very close to finished by then. I am working on the scale static prop and hub.
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Old 09-15-2009, 06:02 PM
  #102  
JohnF
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Default RE: 32% Aviatik 30.40

Decided to see how she would balance and the weight. It appears that balance will not be a problem but the total weight is more than I planed. The Fuselage as it is hanging from the meat scale is 25lbs. This includes all radio gear, engine, battery. With the wing, struts some rigging, guns and some other small details I figure the total weight will be around 30lbs. I am using a 32oz. fuel tank so If I keep it full I don't think I'll need to add any more nose weight.
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Old 03-23-2010, 09:48 AM
  #103  
JohnF
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Default RE: 32% Aviatik 30.40

Wow It's been awhile since I posted anything. Well, I discovered my scale was off by 8lbs. So now the total weight is around 20lbs. Much better. Maiden flight should take place around middle of April. Here's a couple of pic's of some details I have been working on. Sorry for the double pic. I can't see how to delete it.
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Old 03-23-2010, 12:03 PM
  #104  
ARUP
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Default RE: 32% Aviatik 30.40

Cool airplane! I'd like to build a Loyd 40.15 or .16
Old 03-23-2010, 12:28 PM
  #105  
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Default RE: 32% Aviatik 30.40

The Lloyd 40.15 and 16 are very strange looking aircraft.
Old 03-23-2010, 12:41 PM
  #106  
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Default RE: 32% Aviatik 30.40

Beautiful! Whose going to be your pilot on testing??
Old 03-23-2010, 12:55 PM
  #107  
JohnF
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Default RE: 32% Aviatik 30.40

Hey DJ good to hear from you and thanks. I have hooked up with Ron Prestin who will do the maiden. Ron is an accomplished pilot and I do not doubt his skill. We have been doing prop testing and have a few more to try. If it flies well you are, of course, welcome to take the sticks any time.
Old 03-23-2010, 02:32 PM
  #108  
JohnF
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Default RE: 32% Aviatik 30.40

Okay, this is how I decided to make these scoops. I am using a 1" dia. wood bead. I flattened one side and hollowed it out using various Dremel bits. I drilled a hole in the side using a Fostner bit and glued a dowel into it. I slipped a aluminum tube over the dowel which is the proper size and just meets the aluminum panel. The dowel goes through a hole in the panel and is glued to a piece of sheet balsa which is glued to the inside of the aluminum panel. I'll use some JB Weld to fill between the aluminum tube and the wood bead to make it look like one piece. It will be painted a bronze or copper color.
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Old 03-23-2010, 03:25 PM
  #109  
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Default RE: 32% Aviatik 30.40

John,
Beautiful work as always. If it is weighing in at 20lbs the Briggs (on gasoline) should be enough power and with gas/glow maybe plenty of power. Best of luck on the maiden and I hope we can see video!

John
Old 03-23-2010, 03:49 PM
  #110  
JohnF
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Default RE: 32% Aviatik 30.40

Thanks J, So far all the engine/prop test's indicate It will have plenty of power/thrust. Worse case is I put the 65cc Stihl, 4-stroke in
Old 03-24-2010, 01:22 PM
  #111  
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Default RE: 32% Aviatik 30.40

Here is the finished air scoop. I am told they were made of copper. Still have to permanently attach them.
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Old 04-08-2010, 04:03 PM
  #112  
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Default RE: 32% Aviatik 30.40

Well, just an update on the engine situation. It turns out the total weight of the Aviatik has reached approx. 27lbs. and at this weight the 40cc, 4-stroke, B&S just isn't going to get it done so, Ron Prestin has loaned me a brand spanking new G62. Two pounds of lead was required for balance. There will be no question about power and we will get a better idea of how the model flies. I am in the process of doing a 65cc, Stihl, 4-stroke gas/glow conversion and if that works out I will probably take the G62 out and use the Stihl. Just can't beat the sound of those four strokes! Plane Pounder has made me an adapter that will enable me to get the glow plug deep into the head of the Stihl. I will do a short thread on the conversion once I get it running. Stay tuned.
Old 04-09-2010, 10:18 AM
  #113  
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Default RE: 32% Aviatik 30.40

John,
Hats off to you for building a unique model...don't think I've ever seen on of them.
I'm sure it will fly as impressively as it looks.

I to have much difficulty with the two stroke sound in WWI and vintage aircraft ( I know it's all subjective) but that four stroke sound is pure music to my ears.

I would be very interested to see how your 4 Stroke Stihl conversion to glow works out,,, also wondering why you can't just fly it with gas as is? Do you get more power with glow fuel ?

Looking forward to hearing about your maiden!

Old 04-09-2010, 11:23 AM
  #114  
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Default RE: 32% Aviatik 30.40

Mein Duff, Thanks for your comments. There is a great instructional thread under engine conversions ( gas/glow conversions) which was done by Av8tor and it pretty much sums up the advantages of gas glow. In a nut shell, it saves the expense of buying an EI unit and batteries or maintaining them and makes it possible to flip start engines that otherwise would need an electric starter. There are no timing issues either. There is also usually a rpm/power gain with gas/glow and the engines run cooler. It is a really great solution for making gas 4-strokes usable. Oh yeah, and that cool sound!
Old 04-09-2010, 11:27 AM
  #115  
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Default RE: 32% Aviatik 30.40

Yes John, why glow? Fuel cost X8 consumption X2 a factor of 16 cost wise, not to mention the added take off weight from twice as much fuel. Very confusing. Some weight to be saved ignition system wise but it doesnt balance out to me.
Doc
Old 04-09-2010, 11:49 AM
  #116  
JohnF
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Default RE: 32% Aviatik 30.40

Well Doc, I can only speak from my experience with the B&S, 40cc, four stroke on gas/glow. I ran this engine for hours and did not see any extreme use of fuel. It depends on what you do with carburetion and many other factors. I would have used the same size fuel tank and carried the same weight anyway. The price of fuel/nitro is not an issue for me either. If you flew every day maybe it would be but for the number of times a model is actually flown I don't think the cost is unreasonable. Maintaining battery packs is more of a nuisance to me than mixing some fuel. It would also be a long time before I spent the approx. $175. it would cost for the EI and batteries. So far, I have not had to do anything more than mix pump gas with nitro. No other additives. It seems to me that many other people are very happy using gas/glow also. It's all just a personal choice.
Old 04-09-2010, 01:42 PM
  #117  
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Default RE: 32% Aviatik 30.40

I guess I dont understand it all that well because I thought it was the catalytic action of the alcohol and the glow coil that helped maintain plug heat and combustion, and alcohol has only about half of the thermal efficiency of gasoline which is why glow engines normally use so much more fuel than a gasser. Oh well
Doc

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