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  #1  
Old 01-16-2018, 11:51 AM
drdriddle drdriddle is offline
 
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Default crazy question

has anyone considered/tried to build a baggage pod? something that could be attached to hard points on the bottom of the fuselage? is this possible? thinking about a little more baggage on long trips. i get there would be a drag penalty and would have to conform to CG limits

thanks

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  #2  
Old 01-16-2018, 12:29 PM
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goatflieg goatflieg is offline
 
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I've considered it... to haul my wife's folding wheelchair under the RV-8... but I think I'll engineer a rolling walker or push chair that disassembles to smaller pieces instead.
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  #3  
Old 01-16-2018, 12:36 PM
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Mike S Mike S is offline
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http://www.motorcyclepilot.com/pods.php

This is for a 10, but it could suggest ideas maybe?
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  #4  
Old 01-16-2018, 12:54 PM
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I have always thought this would be the external baggage pod for my -9 if I decided to do it.


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  #5  
Old 01-16-2018, 01:03 PM
scsmith scsmith is offline
 
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I've thought about it a lot. I put in four hard points in the belly using the wing tie-down extrusion, riveted to the under-floor ribs. I currently have flat-head screws plugging the holes where the attach bolts would go up into the hard points.

My plan was to make a pod that could carry a bicycle. It would have a semi-circular front and back where the wheels would nest into the front and back. then the frame would sit in between. The front and back would wedge shaped from the side, matching the angle of the wheels. It would only need to be about 8" deep in the middle assuming you take the pedals off the bike.

I found that it had to be so long that to get the c.g. of the pod and contents near the c.g. of the airplane, it had to extend fairly far forward, almost right up to the exhaust pipes. I was worried about the exhaust flow impinging on it, so it would need to have some metal, not just fiberglass, around the front.

Then, I got onto some other projects, and have not done anything about it.
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  #6  
Old 01-16-2018, 01:13 PM
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Default Cargo pods

There is a company I saw on the web that makes them for ultralights. They are mounted backwards from the way we would mount them on an RV (up vs down). You could probably contact the company to make the door on the side facing aft instead. Looks like an oversized wheel fairing to me.

http://www.uflyit.com/cargo_pods.htm


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  #7  
Old 01-16-2018, 01:20 PM
rv7charlie rv7charlie is online now
 
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Structurally, using the wing tiedown hard points or the volume in the wing tips makes more sense (at the expense of spin recovery ability, if you think you might get into a spin while carrying extra baggage...).

Wing hard point aerodynamic pods have been done, both commercially and DIY. The earliest I know about were done, IIRC, for a Thorp T-18, and were shaped aerodynamically to provide compensating lift. Very little speed loss. I've got the drawings for those in pdf form, but I just did a search & cannot put my mouse on them at the moment.

Also been done a lot on EzEs:
https://www.google.com/url?sa=t&rct=...4fQFUxcMaivIXB

There was a company making them specifically for RVs a number of years ago, as well.

If you can divide your volume between two pods, it might be worth spending some time with the google on the subject.
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  #8  
Old 01-16-2018, 02:11 PM
Kyle Boatright Kyle Boatright is offline
 
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If I was doing something like that, I'd look hard at "Slipper Tanks" like were used on the DeHaviland Mosquito and various EZ types. They keep the CG where you want and should be a low drag solution. You could use the tie down point to anchor them.

http://farm5.static.flickr.com/4001/...3db364d516.jpg
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  #9  
Old 01-16-2018, 02:55 PM
drdriddle drdriddle is offline
 
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Thank you for all of the quick responses. Lots to look at and think about. I like the pods designed for the EZ aircraft and like how they attach. Am thinking of something for an -8a. Rv7charlie, if you run across that pdf i would be interested in it. Thanks
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  #10  
Old 01-16-2018, 03:21 PM
rv7charlie rv7charlie is online now
 
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Sorry; I'm striking out on finding the plans. I suspect that the Thorp reference was to 'drop tanks' designed by Tom Hunter, but the concept works (and would be much simpler) for just baggage.
https://www.youtube.com/watch?v=a9_TqOB6_Jk

http://thorp18.com/forum/topic.asp?A...&TOPIC_ID=5781

http://thorp18.com/thorpforum/search...&submit=Search

Dig around in the both the Thorp list archives; you may find more info.

EDIT: The end of the youtube video has Hunter's contact info, but the video is about 8 years old.

Charlie

Last edited by rv7charlie : 01-16-2018 at 03:26 PM.
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