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Old 4th November 2005, 22:03   #1
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Default BHP takes to the skies

Hi all, this is an exciting new project that I am involved in. Although having nothing to do with either cars or bikes, it does involve engines.

The project is to build India's first wholly indigenous 10' wingspan R/C aircraft. It would have the potential to be a UAV (unmanned aerial vehicle). One of the highlights of the project is the 35cc engine of the type used in crop spraying:



The engine makes about 1 hp in stock form at 5000 rpm. (grossly inadequate)

I've ported the engine and made an expansion chamber for it. Right now engine testing is underway.

A problem that we anticipate is the stock carb: It is both inadequate as well as unsuitable for aerobatics & inverted flight, being a float-type carb. So we've replaced it with one from a chainsaw. This is a pressure-pulse carb & has no float, so can be operated in any position because it draws its own fuel.

Engine with carburettor mounted to makeshift airframe:



Engine with prop and expansion chamber:



The chamber hasnt been done properly and will be replaced when installed in the plane.

The prop deserves a special mention here because it was hand-carved in a single day by Mr. Shivakumar (one of our team).


The makeshift fuel tank with inbuilt flow control valve (guess what it is!):



Let me know your thoughts on this. Any suggestions are most welcome.
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Old 4th November 2005, 22:08   #2
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Dude best of luck for your project and we all hope it would be an interesting one.Desi Stuff.
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Old 4th November 2005, 22:16   #3
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hey dude.nice pics.all the best.by the way how big is it length , height and wingspan ??
when is it scheduled to be ready.


rev
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Old 4th November 2005, 22:30   #4
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Hey Ananth, thats cool man...such a little breather from our baleno, NHC, palio etc stuff!!!

I appreciate the hand made wooden prop but in the pic the top blade is longer than the other one or is it an angle illusion??

What is the reason for such a small motor??? You can atleast use a luna magnum engine just be be a little safe on the power part...

Can you post the blueprint of the end design?? Will surely give some critical feedbacks as I have seen many light craft buildup documentaries and remmember pretty many a nitty gritties in the design front...for example the advantages and disadvantages of having a curved wing end and having a rear free rotor etc...
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Old 4th November 2005, 23:32   #5
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I think it must be an angle illusion.

The reason for using this motor is that its the lightest among the lot...3 kg and we need to still trim it down some (tough, as it is all-aluminum). The Luna & TVS are very heavy and the gearbox needs to be cut away.

The engine should make 3-4 bhp after all mods are completed.

The wingspan is around 10 feet and the fuselage length is about 6 feet. I am not sure about the height. The design policy we are adopting is to make everything as we go along.

Right now the project is in its initial stages & the engine is being worked upon since it is critical. This engine will be tested in a 60-inch R/C speed boat (also wholly indigenous & probably also a first in India). Pics of this will come tomorrow.
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Old 4th November 2005, 23:37   #6
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wow ! thats an exciting project. where are you doing this project? is it a research project ?
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Old 4th November 2005, 23:44   #7
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Quote:
Originally Posted by ananthkamath
The engine should make 3-4 bhp after all mods are completed. ..
Hmmm, no comments on that one as it would depend on the kerb weight of the craft...but yeah crop sprayer engines are pretty light weight.

Quote:
Originally Posted by ananthkamath
The wingspan is around 10 feet and the fuselage length is about 6 feet. I am not sure about the height. The design policy we are adopting is to make everything as we go along. ..
What metarials are you using for the wings and fuselage wrapping?? My opinion would be plastic sheets, donno what they are called but they resemble the cement bag material.

Quote:
Originally Posted by ananthkamath
This engine will be tested in a 60-inch R/C speed boat (also wholly indigenous & probably also a first in India). Pics of this will come tomorrow.
Thats cool man...

Kindly put up the design and materials also tomorrow so that we can brainstorm.
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Old 4th November 2005, 23:44   #8
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nice job mate. keep us updated...
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Old 4th November 2005, 23:52   #9
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Ohh that fuel injection management system with variable fuel injection is a blood transmission pipe seen in hospitals..
Amazin idea man...

All the best for your project !!!
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Old 5th November 2005, 00:12   #10
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Quote:
Originally Posted by ThE_DoN
blood transmission pipe seen in hospitals..!!!
You mean Blood transfusion, right!!! Sorry but couldnt help that one...
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Old 5th November 2005, 00:32   #11
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Good concept but some serious questions:

1) The UAV is going to weigh at least 18-20 kgs or even more by the looks of it why not use balsa / fibreglass / aluminium to loose weight
2) Given a wingspan of 10 ft what servos do you plan to use? The prop design at the tips does not look too right, have you tried looking at how many pounds you can pull with the prop?
3) Key aspects of UAV design are low weight and high amount of payload typically front facing would mean your engine needs to be rear mounted
4) Critical factor is range
5) The chamber layout you currently have is going to increase drag

The best method to have anything going is to Plan, Plan and then Replan going by your approach you might succeed in completing the build but will it meet its original expectations?
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Old 5th November 2005, 00:54   #12
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Quote:
Originally Posted by Psycho
Good concept but some serious questions:

1) The UAV is going to weigh at least 18-20 kgs or even more by the looks of it why not use balsa / fibreglass / aluminium to loose weight
2) Given a wingspan of 10 ft what servos do you plan to use? The prop design at the tips does not look too right, have you tried looking at how many pounds you can pull with the prop?
3) Key aspects of UAV design are low weight and high amount of payload typically front facing would mean your engine needs to be rear mounted
4) Critical factor is range
5) The chamber layout you currently have is going to increase drag

The best method to have anything going is to Plan, Plan and then Replan going by your approach you might succeed in completing the build but will it meet its original expectations?
Thanks for the suggestions.

Our target weight is 8 kg without payload. The material will likely be balsa + aluminum + fibreglass + some other trick stuff.

We already have the servos & 9-channel radio kit with us (Futaba; dont know the model number though).

The purpose of the prop shown is only to load the engine and nothing else. We have 20X12 nylon props for the actual aircraft.

We are not focussing on the UAV aspect right now. The only goal is for the aircraft to fly. Refinements will come later & lots of help is needed when we arrive there.

The chamber is only for testing & for the boat. We will be making new ones later on.

We have been planning, building, cutting and modifying the original concept for the past two years since this was my friend's final year project. A wing and numerous fuselages have already been built. Chambers have been tested.
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Old 5th November 2005, 01:08   #13
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an interesting project, ananth...but like others pointed out, a few queries..

1) weight biasing seems to be a problem, at least from the pics.
2) the fuselage structure seems too heavy, too..
3) assuming the propeller span (dia) is about 20 inches, would the thrust be sufficient...? and at what r.p.m's does the motor max..? also, torque specs...?
4) besides the fuel delivery problem of a carb, wouldn't altitudes be a problem too, as the venturi would be confused..? and besides, with the sort of dimensions that you have mentioned, would inverted flight be possible at all, basically since the engine would be under-powered...?
5) is the expansion chamber at all required..? besides increasing drag and gross weight, it's going to bias the weight distribution too... i think the engine and the overall design would be better off without the expansion chamber....
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Old 5th November 2005, 03:11   #14
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cool stuff ananth.....ur damn creative man.. keep up the good work!
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Old 5th November 2005, 09:03   #15
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The fuselage is only a makeshift one...its an old one we built last year but we now know its good for nothing other than testing the engine. Actually its not as heavy as it looks....that s very thin tube you see there...the whole structure weighs about 3 kg.

Using the 20 x 12 prop, our plane should take off if the engine spins it at 5000 rpm +.

Yeah altitude is a problem but our service ceiling will be pretty low to start with.

The chamber does increase gross weight but gives the engine much needed power; without it, the engine is but a pussycat....as I said earlier, this one is only for testing and we will replace this later on...
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