Archive for September, 2009
I just wanted to share a quick review of a some cool T-Shirts I recently ordered from HistoricAviation.com. I also wanted to inform you all of the HistoricAviation website in general.
Well I’m not sure how many of you are into aviation as much as I am, I really like to learn all I can and like to collect memorabilia. Not just about RC Planes but real planes and Jet Fighters too. Well a little while back my Dad gave me a catalog to a cool site called HistoricAviation.com. They had some really cool and unique stuff in the catalog. From cool T-shirts, to vintage nose art, to ceiling fans that look like the front end of an aircraft!
(Here’s a link to the website, just click on the picture)
Seeing all these cool things in the catalog promted me to see what they had online. Well I found the website and did some searching around. The website is a bit cumbersome and not very easy to find things. But after I spent a little time searching around I found some pretty cool stuff. I found it best to download the PDF catalog to view items, then once you find something cool, just search the website by the item number.
I did order a couple cool T-shirts, one of an F-22 and one of an F-35. I was a little disappointed when I ordered them because they were on back order due to popular demand. So it took about a month for me to get them. I did finally receive the shirts and found that they were pretty good quality and worth their value. The images on the back of each shirt is pretty detailed and of good quaility too. So if anyone else would like to get some cool shirts but not in a total hurry to get them (possible slow shipping), I put some links below for you.
(You can click on each of the pictures by size to follow a link to the website)
|F-22 T-Shirt Links|
|F-35 T-Shirt Links|
Here are those cool ceiling fans I mentioned. I think I may have to get one those some day for the hobby room downstairs!
|Cool Ceiling Fan Links|
Anyway, long story short, I found that they had some really cool products if you are a big Aviation fan like I am. It is a little hard to browes the site at first, but if you download the PDF catalog it helps a ton. rcFoamFighters also now is an affiliate to HistoricAviation.com. We plan on adding more product reviews for this site in the future.
My name is Jon McCarty, some of you have seen me flying with Paul and Frank out at the Hermann Airport. Paul and Frank asked me to share a product I recently started using as an EPP plane covering. Its called Doculam (Well it used to be, I think it changed names). Its a laminating film, meant to run through a large laminating machine. The film i am using is 1.7 mil CP, Its a low temp film perfect for foam use. The adhesive is heat activated so it only sticks where you want. The 25″ width on the rolls means you can use one piece and cover most park fliers. The company I ordered from sells this in 2 roll minimum’s but for a small surcharge they will sell one 500′ roll. which if your like me is more than you will probably ever use.
The film starts out a milky white color with a dull side and a shiny side, the dull side is the glue. I found a small craft iron at the local Wally world called the Tulip (Its pink, but it works and is $10) which after a few min. gets up to an almost perfect temp to apply the Doculam. I have also used the wife’s clothes iron, which heats up faster and is a bit hotter, caution the the low temp doesn’t need high heat, I use the big iron at about half temp.
One of the reasons I wanted to try this film is the fact that it can be painted. I have tried several types of spray cans, from Wally world cheap stuff to Krylon Fusion, which I hadn’t found a way to use that on or even near foam. The Krylon Fusion works very well as a base coat with no chipping or peeling even when I folded a test piece 180 deg back on itself.
As far as strength goes, I recently had an opportunity to test the strength of the Doculam on my version of Franks Sky Fighter. at this time I believe I had the ESC fail which caused total control loss while I was traveling nose down at around 100mph!! there were a lot of firsts in this crash:
First time I stripped servos in a crash, I got both of them.
First time I did that much damage to a battery and had it stay in the plane.
First time I had an ESC look like that after a flight.
First time I lost total control of a plane let alone one moving that fast.
First time I have had a plane hit the ground that hard and be mostly flyable, the major airframe was fine except for 2 small cracks in the lower fuse. there was some damage to the non EPP parts but the EPP survived and will fly again, the Doculam held up great.
If you would like to get some more info on Doculam here is a link to RCGroups thread:
I did some testing on the Doculam, I took 3 – 10″x5″ pieces of EPP. One I left bare of any covering as a control, one I covered in Doculam, and the 3rd I covered in fiberglass weave and Doculam.
I then set my hanging scale so that the part would be suspended 3″ from my table top from its center. I measured how much force it took to flex the part so that both edges touched my table. I also weighed each part to get an idea of how much weight was added. here are my results:
Bare EPP: weight- .5 oz force- 3.64 lbs
Doculam covered: weight- .6 oz force- 5.22 lbs
Doculam/Fiberglass covered: weight- .7 oz force 7.08 lbs
Now the bare EPP and Doculam covered both took as much force to flex it as it took to maintain it, but the Doculam/fiberglass covered took more force to flex it but didn’t require as much to maintain it, it was 7.84 lbs to flex it but only 7.08 lbs to maintain it. Also something else I noticed that was surprising was that the Doculam/fiberglass covered piece bounce back closer to flat than the other two pieces did.
So my findings were as I suspected, that covering your EPP in the Doculam added strength but the addition of fiberglass as Paul and Frank recommend added much more rigidity.
I hope you find this information helpful in your future builds.
If you would like to try a small amount I have 500′ and will sell some at $.50 a ft plus shipping. email me at email@example.com and we can work out the details. This is for US, lower 48 states only no over seas shipping at this time please.
I just wanted to add a post to the blog on the Jupiter Project that we are just starting. This project is a collaboration with Dick Kline (the Inventor of the KF Airfoil) and rcFoamFighters. The original idea for this project started with a suggestion from Dick Kline, he asked if we could do a project that will compare the KFm3 and Clark Y airfoils.
Here is a brief intro to the project written up by Dick Kline:
THE JUPITER PROJECT.
When we filed for a patent on a stepped airfoil back in 1970, Dick Kline and Floyd Fogleman were hoping that it would be seen as a concept worth investigating because of the stall-resistance built into this idea. The Kline-Fogleman airfoil has many favorable characteristics that we felt could be investigated. However, we were met with a wall of resistance from all the experts. It was a terrible idea as far as they were concerned.
Our patent drawings, which showed a sharp leading edge were followed out the window in their wind tunnel tests. However, they were also applying conventional testing methodsto an unconventional airfoil. For example, there wasn’t any testing for a forward push directly behind the step. There was no camber applied along with a rounded leading edge. Our intention was to patent only a step, not an entire airfoil shape, because we knew that it worked in various configurations whether it was on the bottom or on the top. We chose to show the step on the bottom because we knew that L/D ratios reverse themselves when you go from subsonic to supersonic flight. And, we knew that the L/D was higher when the step was on the top, based on wind tunnel tests done at Notre Dame. Therefore, supersonically we would pick up the higher L/D ratios. So we showed the step on the bottom for that reason.
In a book called Fluid Mechanics by Frank White, he shows a number of NASA airfoils producing lift, then reaching a stall point. He also includes the KF airfoil which continues to generate lift out beyond 50º AOA even though it showed a flat upper surface and a sharp leading edge. Although this is a remarkable characteristic of stall resistance, none of the experts thought that it was worth investigating.
The KFm airfoils were embraced by the RC community starting in 2006, because Tony Bernardo decided to try a KF airfoil out for himself. He started a thread which is still going strong and has many contributors to the development of the KF airfoil concept. Today, people from all around the world have accepted the KF airfoil into their building techniques of RC aircraft. What they found was a very easy wing that they could build. Very inexpensive. Very strong. Very high in lift. And, very stall-resistant.
The acceptance of this radical concept still meets with great suspicion and disbelief. “It shouldn’t fly because it doesn’t look like a normal airfoil. It can’t work. It produces too much drag. It won’t fly.”
I have proposed an idea to the RCFoamFighters. What if we could demonstrate that a KFm3 airfoil can lift more weight than the icon of all airfoils: the Clark-Y. Wouldn’t that help to convince people that there is some merit to this radical idea of a stepped airfoil? If it can be demonstrated that the KFm3 can carry a heavier payload along with its ability to resist stalling, it should warrant a more in depth investigation, in my opinion.
Several years ago, Rich Thompsonproduced a comparison study between several KFm airfoils, a Clark-Y and a symmetrical airfoil. The KFm2 and KFm3 came out with very high marks overall. But this did not impress the people who are the experts. Maybe a real world weight-lifting test would persuade them to take a second look?
Who knows. Only time will tell.
In the meanwhile, what is known is that the KFm airfoils work extremely well in the UAV arena. That has been demonstrated successfully a number of times over. It takes a leap of faith to trust your camera, motor, batteries and servos to a strange-looking airfoil that is not supposed to work in the first place. And, have that aircraft return to you safely with all your precious equipment intact. Now, who wouldn’t want that advantage?.
After a few emails back and forth to Dick Kline, I developed a concept for the plane we could build for this project. We both decided it would be neat to build a plane in the style of a large Military Cargo Plane. Below is the Concept Drawing of the plane we will be building, the C-54KF Jupiter:
So in the coming weeks I will begin to build the plane out of EPP Foam. Once we get the plane built and flying good we will run it through a series of tests and comparisons with the KFm3 airfoil and Clark Y airfoil.
Last, here is the first video in the Jupiter Project Video Series:
Hey Just want to let everyone know that we will be doing occasional reviews of Kit planes that We feel fit in with our style and that we think would be fun to build and fly. Don’t worry our main focus is still going to be on scratch building. We just thought it might be a nice change to do every once in a while. Especially for those who may not be ready to scratch build. The MultiPlex FunJet definitely fits our style. I have been wanting to build one of these ever since I started seeing videos on YouTube of these planes flying 140 – 150 mph. Here are some quick points on this kit.
- Easy to follow detailed instruction manual
- High quality parts fit, finish and materials
- Assembles with CA glue and a few tools
- Quick assembly (one night with everything needed)
- Will accept a large variety of batteries and power systems
- Motor mount adjusts with screw from + 5 degrees to – 5 degrees
- Ram air ventilated fuselage to keep electronics cool
- Servo covers provide protection and cleaner looks
- Broad flight envelope from very slow to extremely fast
- Very predictable and stable flight characteristics
- Docile enough for beginners extreme enough for experts
After only flying this plane for one weekend I am very impressed with the performance and how easy it flies. I’m sure I will be flying it a lot in the future and pushing the speed envelope more and more as I get more familiar with the plane. I would recommend the MultiPlex FunJet too any adrenaline high speed junkies out there!!! This Plane really lives up to Its name “FunJet”!!!
Here is a the YouTube Video Review:
Last if anyone would like to purchase a Funjet for them selves they can find them here at Hobby People.
Instructions on How to Enter the Drawing.
To enter the Drawing, you will need to do the following:
- Subscribe to our rcFoamFighters YouTube Channel if not already.
- Send an email to firstname.lastname@example.org
- In email include your YouTube Name.
- Make Email Subject “September 2009 Drawing”
That’s it, do this and you will have a chance to win this months prize.
Prize For September 2009 Drawing:
For this Drawing/Giveaway, for the Month of September 2009, the prize will be:
- Weller Thermaboost Heat Tool (Hot Knife) (Note works only on 110v US power)
- Logon Model 1500 Foamboard Cutter
- Turnigy 1600kV Brushless Outrunner Electric Motor
Youtube Video of the Prize:
This month we thought we would change it up a little and giveaway some of the tools we really like to use for scratch building. These are some of the most used tools in our toolbox. We hope they will also be a good benefit to our lucky winner. Just a note to all those outside the USA, you will most likely need a voltage converter to use the Weller Hot Knife tool as it is created to work with the USA standard 110v power.
Good Luck To All Who Enter!!!
Update (9-30-09)!! kwboom is the Winner of the Sept. 2009 Prize!
Last, here is the YouTube Video Series we did on the original Foam Fighter 15:
Just wanted to add a quick product review write up for the Proxxon Hot-Wire Foam Cutter. For everyone who may be into scratch building foam RC planes, there is a cool tool for cutting all types of Foam, easily, fast and efficently. Frank and I are always searching for affordable, but good tools to help aid us in the production of all the scratch build RC airplanes we make. So far one of the best tools to date that we have found is the Proxxon 37080 Hot Wire Cutter (THERMOCUT).
Please see Frank’s Video Review here:
Here are a few quick bullet points about the Foam Cutter:
- Adjustable Temp Setting via a Dial.
- 98 Feet spool of replacement wire (Should last quite a long time).
- Aluminum Table top finish with measured straight and angular guidlines.
- Adjustable Hot-wire. You can angle the hotwire, good for making Beveled cuts.
- Sturdy, Quality Construction
- Fully adjustable guide fence. Can be set at various angles or straight. Can also be used on front or side of cutting table. (one of the most awesome features)
- 13-25/32″ Throat with a 5-33/64″ height.
- Seen as low as $104.
Bottom line is both Frank and I give it a 5-star rating. I think its definately one of the best tool purchases we have made. Our build times are quicker and easier with this tool. I think its a great value for just over $100. It has great quality, it’s, versatile and easy to use with great results. If you are only building a plane once in a long while then it may not be the best for you, but if you build many planes often as we do, then I think you’ll find it well worth the price.
Last if anyone is looking to purchase one, you may look at your local craft or hobby stores to find one. Frank and I purchased ours through Amazon.com. I’ve included a link below for anyone who may be interested in getting one from Amazon too.