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How to Enter the Drawing.

To enter the Drawing, you will need to do the following:

  1. Subscribe to our rcFoamFighters YouTube Channel if not already
  2. Post a comment stating you wish to be entered in the comment area of the YouTube Video at the following Link:


For this month of June 2010 The prize will be one of the fastest motors we have found yet!! The same 1600watt motor that was originally used in my FunJet to hit 146mph and later was used in Paul’s SuperNova Jet to hit 143mph both on 5s lipos. If speed is not your thing the you can drp down to 4s or 3s an turn a huge prop for those larger planes. Here is the prize listed below.


Prize: Tunigy 3648-1450kv brushless motor

  • One Turnigy 3648-1450kv motor (rated to 1600watts)
  • Prop adapter
  • X style motormount and screws
  • Bullet connectors and heat shrink tubes


Pictures of prize:

Good luck to everyone who enters!!! 

Update 6/30/2010 – Winner of this prize is “my2cents0“, Congrats!

How to Enter the Drawing.

To enter the Drawing, you will need to do the following:

  1. Subscribe to our rcFoamFighters YouTube Channel if not already
  2. Add a comment “Enter Me Please” in the comment area of the YouTube Video at the following Link:


Sorry for the late post on the information for this April 2010 drawing. For this month of April 2010 there will be one prize which is listed below.


Prize: Tunigy 2836-2350kv brushless motor / 40A TowerPro esc

  • One Turnigy 2836-2350kv motor (rated to 480watts)
  • Prop adapter
  • X style motormount and screws
  • Bullet connectors and heat shrink tubes
  • One TowerPro 40A esc ( connectors not included)


Pictures of prize:



Drawing Winner Update: The WINNER of the April 2010 drawing is nkdurret!! Congratulations!!

After using this system in my FunJet to hit 146mph I have to believe this is the ultimate low cost 1600watt power system for under $90.  I will definitely be using this system in more of my upcoming builds as I think there is more to be squizzed out of it!! If you haven’t seen the FunJet video please check it out below. I have also included direct links to the seperate components to this system for those who dare to go this fast!!!! The complete setup for under $90 includes the following (Click on the pictures to go to Hobby City’s Website for even more information) :
Turnigy 3648 1450kv 1600watt Brushless Motor

Turnigy 3648 1450kv 1600watt Brushless Motor


HobbyKing 90-100amp esc rated for 2s-7s LiPo Cells

HobbyKing 90-100amp esc rated for 2s-7s LiPo Cells


Turnigy 3-5amp UBEC rated for 2s-5s LiPo Cells

Turnigy 3-5amp UBEC rated for 2s-5s LiPo CellsZippy Flightmax 2200mAh 40c 5s1p Lipo


Zippy Flightmax 2200mAh 40c 5s1p Lipo

Zippy Flightmax 2200mAh 40c 5s1p Lipo



1600watt FunJet video – Hitting 146mph at Hermann Airport. Check it out!!!!

Hey everyone I finally put a 5 cell setup in my FunJet and man is it fast!!!! Below is the video of the installation and first test flights along with a list of the components and prices. I got all this from HobbyKing .com for under $90 so this is a very affordable and powerful setup (1600watts) Check it out!!

  • Turnigy 3648 1450kv brushless motor (rated @ 1600watts) $19.89
  • HobbyKing 90-100amp esc $29.99
  • Turnigy 3-5amp ubec (rated for 2-5 cell LiPo) $7.83
  • Zippy Flightmax 2200mAh 5S1P 40C LiPo Battery $32.17
  • Total cost (89.88)

Link to!

How to Enter the Drawings.

To enter the Drawings, you will need to do the following:

  1. Subscribe to our rcFoamFighters YouTube Channel if not already
  2. Send an email to
  3. In email include your YouTube Name
  4. Make Email Subject “November 2009 Drawing” 

Hey guys sorry for not posting this information sooner. For the month of November we will be having a Double Drawing. The first one is because of the mix up with the October 2009 drawing where a few names were accidentally left out so we will be giving away the same exact motor / esc combo we gave away last month (Suppo 2217/6 & 40amp esc ). The other drawing for November will be the mystery Prize I announced in a recent video as a GRAB Bag Prize!!! This prize could be anything!! It might be something really good or ? The grab bag prize will be revealed on the night of the drawing after the winner is announced. Everyone who enters the November 2009 Giveaway will automatically be put into both drawings so please don’t miss out!!!


Prize#1 (Suppo 2217/6 Matched Combo)     

  • One Suppo (BL-2217/6) 1500kv Brushless Motor (rated at 300w)
  • Prop Adapter
  • Bullet Connectors
  • “X” Style Motor Mount Plate
  • Suppo 40A ESC





Prize#2 (Mystery Grab Bag)

  • Might be something really good or ?
  • Could be anything!
  • Will be revealed after winner is anounced


MysteryBox 400


Thanks for watching rcFoamFighters videos and visiting the Blog. We appeciate all the support we have been getting from everyone!! Good luck to you all in this months Giveaways!!!



Update, Drawing entries received as of 11/29/09:

Please check and verify your name is on the list.

(Click on picture for a larger view)


Drawing names Received.

Drawing names Received.


Multiplex FunJet

Multiplex FunJet

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.




Hey everyone, I gave Paul the dimensions to my new plane The Sky Fighter version 2 and he has already finished the basic template plans for the plane. These are not intended to be 100% complete plans with full instructions but more or less the basics that you would need to build the plane on your own.  After all we like to promote scratch building planes and are not selling kits or complete plans. We would like to see everyone personalize their plane to make it their own. So please use these templates along with your own imagination to finish the plane to your own likings. Here are some of the specs and features of the Sky Fighter v2:

  • Bulletproof construction from EPP Foam and Henrys fiberglass weave sandwich layers
  • Built for all out speed with thinner 15mm wing , narrow fuselage  and rear mounted motor
  • extremely maneuverable with very high roll rate 3 or more rolls per second
  • 26.5 inches long with 28 inch wing span a.u.w. approximately 24 ounces
  • Power system Suppo 2200kv Brushless motor and Suppo 30amp Brushless esc combo
  • Batteries Zippy Rhino 30c 1350 mAh 3s1p LiPo
  • Capable of speeds well over 80mph with apc 6″ x 4″ prop
  • Watt Meter results with apc 6″x 4″ Prop – 300watts @ 28amps
  • This Plane is not recommended for beginner pilots

Please Click on picture below for FREE DOWNLOAD of PDF templates:

Free Sky Fighter V2 PDF Template

Free Sky Fighter V2 PDF Template


View the YouTube Video of the Sky Fighter below:

If you have been following the Bullet Proof RC Plane Build Along series of videos you probably know about the recent crashes I had with the plane due to receiver issues. These crashes were caused by either low voltage lockouts or receiver range issues resulting in two destroyed LiPo battery Packs. After that happened I decided to solve the problem before it destroys any more batteries. Here are a few things I found out:

  • Spektrum makes a plug in capacitor to eliminate low voltage lockouts
  • Spectrum Parkflyer receivers only have a 1000ft range
  • Park flyer receivers are not recommended for fast planes or high flyers
  • LiPo Batteries can be disposed of easily and are environmentally safe
  • LiPo batteries must be completely discharged before disposing
  • Bad or damaged LiPo Batteries can be safely discharged in a salt water solution.

Please watch the video below for more information:


Thanks and I hope This can be useful for anyone having these issues or better yet will help to keep you from encountering them. If you do end up with any damaged Lipo Batteries you will at least know how to dispose of them properly. Thanks for visiting rcFoamFighters Blog and for all your support. Here are some links to the information I found.

Downloadable PDF file on ThunderPowerRC web site on proper disposal of LiPo Batteries:

Spektrum plug in capacitor to eliminate low voltage lockouts:

Forum on Spektrum Parkflyer Receiver Range :

Now that Phase 1 is complete our Bulletproof Build Along #1 will be moving into Phase 2.  Below we have listed the recommended parts that will be need to complete Phase 2 of this build.

General Building Materials:

  • 1/16″ x 4″ X 24″ Basswood (1) sheet
  • 1/8″ X 3″ X 36″ Balsa wood (1) sheet
  • 3/8″ X 3/8″ X 24″ Basswood (1) stick

Recommended Motor options:

Any 2000kv to 3000kv motor capable of 200watts output or more. Please note there are two motor options listed under motor examples. Please select accordingly to your flight skill. Option 1 is a less powerful setup, but should still offer great performance. Also option 1 is available at our Affiliate rcHotdeals at the link below, listed under “Combo Packages” once you follow the link. Option 2 is much more powerful and we recommend only pilots with some good flying experience to persue this option.
Motor Examples:

  • Option 1: Suppo BL-2212/6 2200kv Brushless motor & Suppo SP-30A ESC Combo (use 25c or 30c batteries)  Motor and ESC Combo available from our affiliate rcHotDeals, under “Combo Packages” for the low price of $29.99.


Link to rcHotDeals

Link to rcHotDeals


  • Option 2: TP 2415-09T 2700kv Brushless motor use with SuperSimple 50A ESC or equivalent 50amp ESC (must use 30c batteries with option 2). Option 2 is available via HobbyKing (HobbyCity). rcFoamFighters is not an Affiliate with HobbyKing (HobbyCity), but we have used them for parts on several occasions with positve experiences.

 Link to Option 2 motor at HobbyCity:

Motor stick mounts:

  • HTX stick mount (or equivalent stick mount)

Servos etc.

  • Hitec HS-82MG (2 needed) or any metal gear servos (9g to 19g)
  • Great Planes small 3/4″ nylon control horns (1 pair) or equivalent
  • Du-Bro super strength servo arms (1 set) or equivalent
  • Du-Bro control rods with metal clevis (1 pair) or equivalent

 Recommended Batteries 

  • Battery max constant amp draw must be 1.5 times motor max amp draw
  • Zippy Rhino 2250mah 3s1p 30c lipo batteries (67.5amp max constant)
  • Zippy Flight Max 2200mah 3s1p 30c lipo batteries (66.5amp max constant)


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Ø  Most affordable hotwire tool available (priced from $7 to $13)

Ø  Must have tool for cutting and shaping EPP and most other types of foam

Ø  Extremely portable battery powered (requires two D cell batteries)

Ø  Very reliable and simple to operate making it user friendly

Ø  Includes spare replacement wire strands



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So now it’s time to start Phase 1 of the Bulletproof Plane Build Along. In the below videos we start with going over the tools needed and then move on to drawing the wing layout on the EPP foam.

Link to Wing Drawing Dimensions  (This is not a template):


Stay tuned, this build will feature more videos soon.


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Big News! Dick Kline Inventor of the KF AirFoil Contacts rcFoamFighters.


The following posts are excerpts from e-mails sent to us from Dick Kline along with information provided by him on the various types of KF Airfoils. If you are thinking about experimenting with any of these airfoils or just want to know more about them this information should be very helpful.



(Copy of Email from Dick Kline to rcFoamFighters on 3/28/09)


Hi Frank and Paul…


You both are more than welcome to do a video of the KF airfoil.

I’m delighted that you are interested in this concept that has been trashed by the experts for over forty years. They claim that it is too high in drag. However, when the step is applied to a flat plate it appears to go faster. The KFm4 goes even faster than the other KFm variations.


When a KF step was applied to the end of a prop it increased the thrust by almost 9%. If the step produces too much drag, how can it become more efficient.




Personally, and I’m no expert, but I believe that 50% of the KFm4 produces no direct friction or drag because it is air against air. That’s kind of mind-blowing to think that half of the airfoil doesn’t come in direct contact with the air around it.


Have you guys ever heard of the Kamm effect? In the 1930s, Wunibald Kamm who was a German aerodynamicist, chopped off the rear end of his racing car. At that time it was thought that the tear-drop shape was the most aerodynamic. The blunted rear end proved to be more aerodynamically efficient, which is why most cars today come with blunted rear ends. That includes the hybrids, which are looking for fuel economy.



In fact, the Boxfish has inspired blunted rear end designs.



Here is one study done in 1998 that shows some positive characteristics of the step concept.


Finally… Here is a list of the positive characteristics that the KF airfoil has shown to date:


1.  The KF airfoil handles a wide range of speed from very slow to very fast.


2.  Normal airfoils are designed to either generate a lot of lift in order to carry more weight, which means they must be thicker to produce more lift, or they need to be thinner in order to fly faster thus sacrificing lifting heavier loads. The KF airfoil can do both of these jobs extremely well.


3.  The KF airfoil has a much greater range for its center of gravity (CG). A conventional airfoil would normally have a CG about 33% back. The KF airfoil can be moved back as much as 40%, thus allowing it to carry a heavier load. The further back the center of gravity is the more desirable it is because of the center of balance. And, it can also handle a shifting CG and still give you control authority.


4.  The KF airfoil has great control authority. It’s control surfaces remain effective through a large range of angle of attack (AOA). Even beyond a 60º AOA. This is also evident by its ability to have a very fast roll rate with full aileron and rudder control at very high angles of attack.


5.  Normally, all flying wings require some reflex in flight. Reflex, which will produce some drag, means that the ailerons are angled upwards slightly in order to keep the nose of the aircraft pointed up. It is also well known that flying wings are extremely unstable and stall easily in flight. The KF airfoil requires zero degrees reflex on a flying wing which means no drag from the reflex action. It is a very stable platform. It is capable of flying without stabilizers or rudder, which means that two components which cause drag are eliminated.


6.  The KF airfoil appears to have better air penetration. High winds seem to have little effect on how it performs. People have reported not being able to fly their aircraft during strong wind periods while the KF airfoil continues to fly smoothly. It appears as if it rides on rails.


7.  In addition, the KF airfoil doesn’t appear to be affected by weight increases. It has been reported that the handling of the aircraft doesn’t seem to be affected by adding additional weight. In one case, 4.5 oz. of lead was added and it was able to handle the added weight with ease. In another case, a KF glider which was facing 22 mph wind, flew very well when nearly 100% lead weight was added to it.


8.  At high angles of attack, the KF airfoil remains unstallable. The center of gravity and center of pressure appear to move backward thus preventing a loss of lift.


9.  The possibility exists that the KF airfoil may be more fuel efficient because one quarter of the airfoil produces little friction due to the trapped vortex pitting air against air. A normal airfoil produces friction over the entire surface.


10.Unmanned aerial vehicles are extremely expensive aircraft. The loss rate in the military is rather high – over 20%. The KF airfoil is a minimal structure which is very strong and simple to build. It would greatly improve on the survivability of these planes because of all the reasons outlined above. In addition, because it penetrates the air so well and is extremely stable, it will produce better photography. Because of a better center of gravity, it will be able to carry more weight, either extra cameras or extra batteries for longer flights. And, because of its ability to penetrate air better, it is not affected as much by higher wind gusts. It has been shown to fly in strong winds when all other RC aircraft were grounded.


And, now for the most amazing aspect of all… the KF airfoil has no apparent bad habits, vices or negatives that have shown up. All airfoils have their positives and their negatives, because each one is designed to do a specific job. Thus, a given airfoil can do certain things well, but do poorly in other areas. To date, nothing negative has appeared on the KF airfoil.



The concept behind the Kline-Fogleman airfoil may be hard to understand because it is so different from present aerodynamics. The KF concept uses a vortex, which attaches itself to the KF airfoil behind the step and becomes part of the airfoil. This means that one-quarter of the KF airfoil is air against air. This also means less friction and greater efficiency penetrating the air. It is important that the step be between 7% and 9% at 50% of the chord on top. When the step is on the bottom, the step should be at 40% of the chord. When the step is on top, it will produce higher lift than on the bottom, but the airfoil works well right side up or upside down. With the KFm4 airfoil, which has the step on the top and bottom, 50% of this airfoil is air against air, which means no direct friction or drag.



– Dick Kline


P.S. I’d be very interested in your own personal experiences with the KF airfoil concept. I think that there may be a difference between what is seen or studied in lab conditions is not the same as what happens in the real world. So many people who first see the KF airfoil react to it by saying, “That thing can’t fly.” Somehow it does inspite of everything that we have learned about the way a wing is supposed to generate lift.


Thanks again, guys, for your interest.



Pictures of KFm Airfoil Variations:




Pictures of Kline-Fogleman Effect:





rcFoamFighters would like to thank Dick Kline for

sharing his thoughts, words, time and the above documents

with us.

We will soon be using KFm Airfoils on up

coming projects and seeing how they perform.

Please click on the below link for more in depth information

on the performance of the KF airfoil provided to us from Dick Kline along with the information in this post.



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