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SmallBlimps FAQ

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dude6935
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SmallBlimps FAQ

#0, by dude6935, 07 April 2010 01:02 AM



Please post questions, and I will add them and their answers here.

What is the point of this site?

This is a forum where people discuss small blimps. But this site is about more than that, most of the people here are more than enthusiasts. We want our own personal airships and we believe that we can collaborate to design and build one. Hopefully, one day soon, we will all be able to afford our own small blimp to play, travel, or do whatever in.

Why a small blimp?

Blimps are great and here is why:

    * They fly
    * They are safe
    * They are efficient
    * They have good range
    * They can be quiet
    * They can have large internal space


How is this going to happen?

We have recently focused on developing a basic airship kit. This kit would give anyone a great starting point for building an airship. The kit will consist of an envelope and a connected gondola. All one would need to go flying is lifting gas and propulsion system. This should get us much closer to getting the craft we all dream of flying. The standard envelope will be roughly lenticular. It will be constructed from two flat sheets of material and will look like a foil party balloon when inflated.

How much progress have you made?

We have done well so far. In a year and 9 months, we have well over a hundred members and over 4400 posts. We have skilled people with training in engineering and design, but we always need more people. We have surveyed the group in many different ways, and we have reached conclusions on a few important areas. We plan to build our first prototype kit to meet ultralight specifications. This allows the craft to be operated by almost anyone, without expensive training or certification. We are working to solidify the concept that can be engineered into the prototype. One of the most important things any member can do is to make their opinions be known. Our final product will only improve if we hear what other people want in their personal airships.

What about organization?

As yet, there is no formal organization of the SmallBlimp community. We have discussed many different business and non-profit organizational options. No action is planned on this until the community can agree on which option would be best to pursue.


What about funding?


Most of the details on funding are heavily dependent on the organization of the group. For example, a corporation can sell shares to raise money, while other types of organizations cannot. We selling screen printed t-shirts, but that is our only active fund raising activity. You can check that out here. http://smallblimps.lefora.com/2010/12/09/t-shirt-quote/
 

What kind of people do we need?

Anyone who is enthusiastic about making small personal airships affordable and practical will be welcome. We can use people with skills and we could use people with deep pockets, but that is not necessary. A strong group requires a wide base. All that is required to participate is the desire to do so.

What should I do?

Join, read, and post. There is a lot we can learn from each other, and this forum is as good a place as any to do it. A good place for a first post is the "tell us about yourself thread". We also have web-conferences every Tuesday. If you want to join that, please post to introduce yourself and follow the "Conference Every Tuesday Night!" announcement in the sidebar. http://smallblimps.lefora.com/2009/06/23/tell-us-about-yourself-your-interests-your-skills/page2/#post20

What are the rules?

Respect other people, and try to stay relatively on-topic with posts. That is it until we need more rules.
Posts should only be unilaterally deleted if they are inflammatory, obscene, or to remove a double post.

more to come


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swampie777
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Re: SmallBlimps FAQ

#1, by swampie777, 07 April 2010 10:29 PM

What was the add-in program you used for capturing skype conferences? Skype seems to have multiple instances of the same functionality.

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dude6935
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Re: SmallBlimps FAQ

#2, by dude6935, 19 April 2010 09:59 PM

I think it was Tapur or something like that. It was the only one I could get to work. 

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swampie777
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Re: SmallBlimps FAQ

#3, by swampie777, 27 April 2010 03:41 AM

Where did the aero information for the lenticular shape come from?

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dude6935
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Re: SmallBlimps FAQ

#4, by dude6935, 28 April 2010 06:26 AM

I don't follow, what aero information are you referring to?

Lenticular airships are discussed pretty well in Airship Technology by Khoury and Gillett which is in the recommended reading thread. 

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swampie777
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Re: SmallBlimps FAQ

#5, by swampie777, 28 April 2010 12:58 PM

Some of the earlier posts led me to believe that there was a strong lenticular push going on.

BTW, your ship is a well rounded deltoid, Nav's is a dual rhombic pyramid. Which one is the group going to build?

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dude6935
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Re: SmallBlimps FAQ

#6, by dude6935, 28 April 2010 07:48 PM

Well most support a "modified lenticular" that is like the shape my design uses. This is designed to develop some aero lift and reduce the effect of wind on ground operations. 

My shape is defined by two half ellipsoids, though it may be called a rounded deltoid. The bow is the wide part and the stern is the narrow part. This is the opposite of the aeron 26, deltoid pumpkin seed. 

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navigaiter
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Re: SmallBlimps FAQ

#7, by navigaiter, 29 April 2010 02:39 AM

  << << <your ship is a well rounded deltoid, Nav's is a dual rhombic pyramid. Which one is the group going to build? >> >>

The group cannot tell which design it prefers until all the models are in. Now is the time to be building models to physically show the desirability of various concepts. It seems that in the real world, words and numbers do not earn enough confidence to commit the group to building. 

    I can see a time when one individual's efforts produce a model that is so attractive and convincing that others will want to share in the manifestation of the design in the real world. Hope it happens soon 'cause I wanna FLY.  

Up is halfway to everywhere.

-~~~~~=<(The*Nav)>=~~~~~-
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navigaiter
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Re: SmallBlimps FAQ

#8, by navigaiter, 29 April 2010 02:41 AM


By the way, here is how my "Marvin" is shaping up.  I'm trying to have a sexy enclosed cockpit. The envelope shown is not to scale, it will be twice this size.

-~~~~~=<(The*Nav)>=~~~~~-
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swampie777
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Re: SmallBlimps FAQ

#9, by swampie777, 29 April 2010 05:51 PM

Where you put your "Non-lifting gas space ( pilot, day bed, jacuzzi...) affects your center of buoyancy and the size of the envelope.

P.S. Do you have a front view?

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dude6935
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Re: SmallBlimps FAQ

#10, by dude6935, 29 January 2011 05:31 AM

I updated this FAQ just a little.

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swampie777
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Re: SmallBlimps FAQ

#11, by swampie777, 13 March 2011 08:06 PM

Is a front view to post # 8 available?

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navigaiter
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Re: SmallBlimps FAQ

#12, by navigaiter, 14 March 2011 02:52 AM

[[ Is a front view to post # 8 available?]]

Here is the original SketchUp file in glorious living 3D, just to see how it works on lefora.
Next post will be the png 2D graphic version of the same file.

Yay! It downloads and opens in my local sketchup app which is free from google, everyone should use it for collaboration excellence, methinks.

Attachment: MAD Fat Diamond1.skp (468.0KB)

-~~~~~=<(The*Nav)>=~~~~~-
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navigaiter
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Re: SmallBlimps FAQ

#13, by navigaiter, 14 March 2011 02:54 AM

Here's the flat graphic looking at the nose of my Fat Diamond, old version. I haven't drawn the new version that I'm modeling since it is the same as the model in my video at youtube.com under the tag, "personal ultralight dirigible."

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inventive47
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Re: SmallBlimps FAQ

#14, by inventive47, 14 March 2011 04:09 AM

I like the cockpit in the ship design, it looks alien, I assume you have enlarged the ship slightly to accommodate the extra volume of the cockpit?   Would you consider using a cheap digital projector and cheap color camera for a forward view screen?   Or I guess you could make the lower front of the ship from clear vinyl or thin Plexiglas.

A bad truth is better than a good lie.
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swampie777
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Re: SmallBlimps FAQ

#15, by swampie777, 14 March 2011 12:14 PM

Thanks Nav!!

This shape is probably the easiest to make a model of for measuring drag and moments on.

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satriani
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Re: SmallBlimps FAQ

#16, by satriani, 17 April 2011 05:08 PM

Hello,
Can you give some brief scientific information about blimps and how to achieve flying with them ? I am reading the forum for a while but there are still fundamental questions in my mind. I think that would help to start for people out of subject like me.

1) How much helium or hydrogen do we need to lift an average person ? or the ship that you plan to build ?

2) How big would it be approx. if we put that amound helium or hydogene in one place ? Like a car-big, a long truck-big or even bigger ?

3) There are several advertisement blimps on the market. Also companies (mostly chinese) say that they can build them in custom sizes. Do you think it would be cheeper and effective to order one to make a flying machine ?

4) On the plans you have, is the helium only lifting power or do you always plan it like helium + motors to lift ? Because should the ship you are gonna build be lifting more than the total weight on it so you have to tie it to the ground ?

5) Should the ship have a special shape for the helium baloon to fly ? or could it be flat like inflatable-beds

I am sorry for so many questions. I would be greatful if you answer them.
Thank you.

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swampie777
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Re: SmallBlimps FAQ

#17, by swampie777, 17 April 2011 07:57 PM

Answers mixed in with your questions:


Hello,
Can you give some brief scientific information about blimps and how to achieve flying with them ? I am reading the forum for a while but there are still fundamental questions in my mind. I think that would help to start for people out of subject like me.
1) How much helium or hydrogen do we need to lift an average person ? or the ship that you plan to build ?

1000 cubic feet will lift 72 lbs.

2) How big would it be approx. if we put that amound helium or hydogene in one place ? Like a car-big, a long truck-big or even bigger ?

6305 cubic feet for out ultra-lite model ( there are a number of old posts that discuss your questions)

3) There are several advertisement blimps on the market. Also companies (mostly chinese) say that they can build them in custom sizes. Do you think it would be cheeper and effective to order one to make a flying machine ?

Material selection must be carefully made. The Sun is bad on several plastics.

4) On the plans you have, is the helium only lifting power or do you always plan it like helium + motors to lift ? Because should the ship you are gonna build be lifting more than the total weight on it so you have to tie it to the ground ?

This is personal flight preference. I prefer total buoyancy with buoyancy control. Upon an engine out accident,  I have plenty of recovery/planning time. Other designs force an immediate landing.

5) Should the ship have a special shape for the helium baloon to fly ? or could it be flat like inflatable-beds
I am sorry for so many questions. I would be greatful if you answer them.
Thank you.

The shape can be whatever you can design controls to safely fly it with. The more drag your ship has the slower it will go and the bigger the engines you will need to do anything useful.

-satriani

At the end of the day, you're paying for it $$$$$$, and your safety depends on the design choices you make. These two things drive away some hyper science fiction choices that only work in the movies or in someone's beer filled brain.


hope this helps.

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dude6935
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Re: SmallBlimps FAQ

#18, by dude6935, 18 April 2011 05:22 AM

Thanks for the questions and answers.

Also, 1 cubic meter of helium or hydrogen lifts about 1.1 to 1.2 kilos respectively. This estimate does not take the weight of the balloon into account. 

We haven't really talked much about having a Chinese envelope made. I don't know that enough money would be saved to be worth it. Something to think about though.

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jamesg
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Re: SmallBlimps FAQ

#19, by jamesg, 18 April 2011 01:20 PM

3) There are several advertisement blimps on the market. Also companies (mostly chinese) say that they can build them in custom sizes. Do you think it would be cheeper and effective to order one to make a flying machine

Part of the goal and the "fun" of this project is to design and build something new and "better".
I brought up overseas production options, and several members didn't like the idea. 

If our envisioned production run is only 50 to 100 units as a "cottage factory" then no its probably not worth it.  But if you get more than that, especially if you can get to several thousand at least,  you can save 20-30% on production costs, probably to Mexico.  If you can get to 10K mass market, then its upward of 50%, but then your savings gets eaten up by QA and the global sales apparatus needed to support that volume with this kind of niche product.

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