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Old Jan 22, 2003, 04:53 AM
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Hotliner Plans

I've been seduced by visions of a Hotliner after watching one go vertical into the clouds last weekend. Wrote a Haiku describing it..

Bird drawn aloft
Power. Silence.
F 5 B

OK. The Christmas shopping has depleted the treasury so this ones gotta be home built. Where are the hotliner plans? I am looking for something similiar to the Bandit but built in wood. I have a spare Endoplasma, 3.8:1 gearbox so I'll use that.

Hope someone can help me otherwise I'll have to design it myself.

Thanks

Shane
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Old Jan 22, 2003, 05:25 AM
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It is dificult making a hotliner fuselage in wood, but not impossible. When I started (on a budget) I realised that buying a glass fuselage was going to save a lot of time and then built wings and tail to fit. I started with white foam and veneer, deciding that a built up wing would not be strong enough or accurate enough for my needs. As for the design, I just copied what looked right and what others were using. Wing section is the only thing you really have to decide. Popular sections are MH30, MH33, HD45, RG14 and I'm sure there are loads more that are sultable. I hope the attached image can guide you.

Mike
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Old Jan 22, 2003, 08:54 AM
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Thanks Mike, thats a great start you've given me. I just got 2 tapered carbon fiber shafts that were originally golf clubs and they will be my main spars. I assume thats a fairly accurate scale diagram so I'll scale up for the nose and tail moments. What percentage of the wing area should the ailerons and the elevator be?

Thanks,
Shane
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Old Jan 22, 2003, 09:23 AM
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I used to cut at 22% because I read somewhare that this was correct.

Mike
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Old Jan 22, 2003, 07:42 PM
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Thanks Mike, I'm going to use the wing sections which are for the Allegro_Lite which are on the Charles River R/C club site. They're easily downloadable and I think suitable for my purposes.

Shane
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Old Sep 13, 2006, 08:45 AM
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Did you ever get anywhere with this project?? Just thinking of doing the same thing myself but finding information (ie plans) is prooving a little difficult...
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Old Sep 13, 2006, 10:29 AM
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I got sidetracked building an Allegro E Lite and a Bubble Dancer. I might do it after I finish this 104" Pilatus Porter first...

I have the MH32 foam cores and a vacuum system from an old refridgerator pump but vacuum bagging is pretty taxing unlike balsa construction which is relaxing.

For plans it really depends on your level of experience.... what have you built and how are you at scratchbuilding?

Shane
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Old Sep 13, 2006, 11:02 AM
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I've built plenty of kits, but all smaller electric planes rather than big gliders, and all balsa wood construction as opposed to vacuum or glass. Willing to give glass or carbon a go but will probably stay away from vac pumps for now. Have built from plans too, but they are usually quite detailed, though making things up as you go along is par for the course as far as I'm concerned!

Funny you should mention the Bubble Dancer and Alegro E Lite as I was considering that very thing (the Elegro) - but I'm not sure it's what I'm looking for - more of a soarer than a 'hotliner' I think?? What's your experience of the finished kit? I know there's a fantastic database of info on the model... (I use hotliner in the weakest sense as I know a built up plane will not be a hotliner - but I want all the speed and strength I can get)
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Old Sep 14, 2006, 11:55 AM
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I dont know about the kit - the Windancer from PoleCat Aero you mean?? The finished model is really wonderful to fly... it will slow down and thermal and if you point it down it will pick up speed like a bomb. I had some sort of glitch/ hit once and it headed straight down for a few seconds and really picked up speed. Luckily it had those carbon spars cos I applied full up to recover 20 ft off the ground...the wings didnt fold. I have a few sets of Bubble Dancer ribs and the next one I do will have ailerons. I bet it will make a decent warmliner.
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Old Sep 14, 2006, 12:14 PM
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This is the Alegro I was talking about:

http://www.charlesriverrc.org/articl...egrolite2m.htm

As far as I can see there's not a great deal in the bubble dancer - alegro. If nothing else comes up I guess the Alegro is where I'll go next...

The carbon spars you refere too, I take it that was on a built up wing of an Allegro E Lite or was it the Bubble Dancer?

Ailerons on an Allegro is where I'll start I think.
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Old Sep 14, 2006, 12:41 PM
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Yup, thats the one. Read it through, its not an easy build though the instructions are extensive and Dr Drela is very thorough. I would advise you to build it as is first. It is very responsive and will not give away much to an aileron equipped model. You can always build another wing with ailerons later. Do get the Laser Arts ribset - its well worth it....

Shane
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Old Sep 14, 2006, 09:48 PM
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I've built a couple of hotliners from scratch. Blue foam cores, balsa sheeted and vacuum bagged wings. Then glassed with .58 oz., (super light) glass and exopy finishing resin. All wood fuse covered with 2 oz. glass. Do a search on this site for "Raketenwurm" or maybe "RW2". You should find an excellent line drawing scaled with all necessary dimensions and good three view. If any one is interested and can't find the info, e-mail me and I'll send you a copy. If I can figure out how to post photos here I'll put some up of one I built. In another post.

Dewey
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Old Sep 16, 2006, 06:39 AM
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Here's a couple of photos mentioned in my previous post.
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Old Sep 16, 2006, 11:40 AM
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Dewey,

That is great work. Some questions...

1. How did you finish the LE so that it accurately represented the airfoil?
2. Is the fuse painted or oracoverted?
3. What's the empty weight?
4. What power system are you using?
5. How is the spar constructed?
6. How fast is it?

thanks
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Old Sep 17, 2006, 12:52 AM
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Jay,

Thanks for the compliment. I'll try and answer your questions. I don't know if I can type that much, I use the impaired H&P method - hunt and peck. Here goes.

1. Took the wing halves from the vacuum bag, shaved off the excess sheeting and block sanded the front of the cores, (used a 24" t-bar for sanding). When I got everything straight I bonded some 3/8" X 1/2" soft balsa to the sheeted cores. Planed and sanded that down to a rough shape. I then made what I guess you would call a "reverse template" to use as a marker gauge for the wing root, tip and if I remember right mid point on the wing. Kept on sanding and playing around until I thought I had it about as good as I could get it. Don't know how truly accurate that is but it seemed to fly pretty good.

2. Fuse is all wood. Sides are 1/8" balsa with full length /64" ply doubler. Top and bottom are 1/8" balsa installed all crossrgrain. 1/8" lite ply formers, (3), with a 1/8" five ply birch motor rmount. Entire fuse is covered with 2oz. glass and painted with spray cans.

3.Empty weight? I don't know. The AUP weight with ten
IB 3800's and a Neu 1509 1D was 66oz.

4. See #3.

5. The spar was a piece of solid 3/16" X 3/8" carbon. This was a High tech choice. I had it laying around, so I used it.

6. How fast? That's highly subjective. I had no radar gun then. It was somewhat faster then some previous ten cell set ups I've had but they were different airframes and not that motor. I now have an RW2 with that same 1509 1D and ten IB 4200's. It's at least a notch or two faster than ANY previous ten cell set up I've had. Again it's all highly subjective.

I'll probably build another one, two or three projects down the road. If there's some interest I could take some photos of the process and post them.

I gotta go. My fingers hurt.
Dewey
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Last edited by dhewson; Sep 17, 2006 at 12:57 AM.
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