EJF Big F(oamy)/A-18

Kevin Cox · Aug 03, 2006, 08:26 PM

I was contacted by EJF (Robert) to build the 8Teen. Since I am one of the Hornets biggest fan I happily agreed. This was on the 7/31 and today it arrived!

I opened the box and he included two 90mm fans and the EJF Economy Pneumatic retracts. While the building won't actually start until late in the weekend the product looks really good. Also included were some cool EJF decals. Here is a my initial peek at it.

bruff · Aug 03, 2006, 09:13 PM

I have one also. It is on big bug! I'm going fixed gear route but twin Midi's on Hacker B50-12S motors.
Bob

AceMigKiller · Aug 03, 2006, 11:22 PM

...where and for how much does one acquire such an aircraft?!?!?...

nopistons96 · Aug 03, 2006, 11:31 PM

keeping an eye on this one. www.ejf.com $189.99

nopistons96 · Aug 04, 2006, 10:07 AM

Hey Kevin, what is your plan on power setup?

FASTBEN · Aug 04, 2006, 05:19 PM

Quote:

Originally Posted by nopistons96

Hey Kevin, what is your plan on power setup?

you can get more info @
http://www.rcgroups.com/forums/showthread.php?t=504469

Kevin Cox · Aug 04, 2006, 07:53 PM

Quote:

Originally Posted by nopistons96

Hey Kevin, what is your plan on power setup?

I have a couple of options that I am looking at but I won't know until I look it the model closely and determine what structural mods will be required to achieve decent performance, affordable (with EDF we use that term loosely) and easy of construction. I will say that nothing going on will be top secret, I will share it all good and/or bad.

For instance, the wing attachment/spar has a priority of 1. Horizontals attachment is 2. Calculating or proving CG which dictates the placement of fans, batteries and landing gear just to name a few.

Kevin Cox · Aug 05, 2006, 09:19 AM

Still examining the model.

I didn't receive any instruction with mine but I did locate the locations for the spars and it appears that .25" diameter rod/tube would be ideal.

RCParkflyer · Aug 05, 2006, 02:05 PM

Best of Luck Kevin!!

Vintauri · Aug 05, 2006, 05:08 PM

Quote:

Originally Posted by nopistons96

keeping an eye on this one. www.ejf.com $189.99

Looks interesting but where would we fly them?

Steve

Kevin Cox · Aug 06, 2006, 02:36 PM

Thanks RCP!

It is late weekend and I have looked at the model more.

Firstly as it sits the intakes can feed a pair 90mm fans but the outlets aren't large enough....by a long shot.

I then looked at the twin Minifan 480 size.
The intake area is there but the minimum exhaust for such a large draggy model is about 58-59mm, at least for me. The model has about 50-51mm.

The next step was to look at the doing it as a single high powered 90mm. This could work well and is something I discussed with Robert when I opened the box. A bifurcated 90mm exhaust is about 50-51mm.

Now it is possible the make new exhaust cone and get either the twin 90mm or the twin Minifan480 to work but that isn't the path I want to take.

Fossil1977 · Aug 06, 2006, 03:35 PM

Wow, looks pretty cool

eagerly waiting Flight time!!

pacro · Aug 07, 2006, 01:41 AM

can this jet be built as twin minifan 480 or single 90mm or must it be twin 90mm

Ed Waldrep · Aug 07, 2006, 10:58 AM

What about cutting the stock exhaust nozzle off and using some sort of plastic cup of the right size? Maybe a margarine container or those plastic single serving cereal containers, or something else? People may look at you funny when you are measuring things in the store buy hey!

A single will make retracts easier as you know, wont have to rotate.

What about a single HW750? Is there enough room? If not then a HW730? Of course that size fan is hard to come by...

Kevin Cox · Aug 07, 2006, 05:42 PM

Parco,
Yes it can be done in all the configurations that you listed. It will depend mostly on the amount of money you want to spend and how much work you feel like putting into it.

Ed,
You are correct on the cup things...I already have them

but I'm still looking at other options. I have a pair of 730s but I was hoping to do something that others could copy if they wanted too (you know how hard they can be to get). Since I really want retracts I not rushing into it. But keep your ideas coming man!

BTW, I have started to glue parts together

.

Aug 03, 2006, 08:26 PM	#1
Kevin Cox Designer/Scratch Builder Join Date: Jan 1997 Location: St. Louis Intl, Missouri, United States Posts: 5,492	EJF Big F(oamy)/A-18 I was contacted by EJF (Robert) to build the 8Teen. Since I am one of the Hornets biggest fan I happily agreed. This was on the 7/31 and today it arrived! I opened the box and he included two 90mm fans and the EJF Economy Pneumatic retracts. While the building won't actually start until late in the weekend the product looks really good. Also included were some cool EJF decals. Here is a my initial peek at it. Attached Thumbnails Small lightweight box ! 31.8 KB · Views: 1973 Full box! 29.2 KB · Views: 1583 All components appear straight and true with no shipping dings 39.9 KB · Views: 3331 Hmmm...The nose gear retract will be in here? Yeah....I have a plan ;-) 30.4 KB · Views: 2552 Since the Super Hornet has entered service the name for the A,B,C,D variants is now Legacy Hornets. My SH next to the taped together Legacy Hornet. This is a big Bug! 21.1 KB · Views: 5209 Last edited by Kevin Cox; Aug 03, 2006 at 08:54 PM. Reason: spelling

Aug 03, 2006, 11:22 PM	#3
AceMigKiller Team EJF >>>WHOOSH>>> Join Date: Jul 2004 Posts: 3,368	!!!!!!!!!!!!!! ...where and for how much does one acquire such an aircraft?!?!?...

Aug 05, 2006, 09:19 AM	#8
Kevin Cox Designer/Scratch Builder Join Date: Jan 1997 Location: St. Louis Intl, Missouri, United States Posts: 5,492	Still examining the model. I didn't receive any instruction with mine but I did locate the locations for the spars and it appears that .25" diameter rod/tube would be ideal. Attached Thumbnails The model has vents on the side and into the intake area. This also appears to be the cable pass through. 29.1 KB · Views: 2826 The upper has the same webbing. 27.5 KB · Views: 2176 I measure the available intake area and each intake has more than 100% FSA for a twin 90mm setup. 15.5 KB · Views: 1867 24.9 KB · Views: 1843 Here are a few spots where the foam might be removed (red) for EDF use. 30.5 KB · Views: 3384

Aug 06, 2006, 02:36 PM	#11
Kevin Cox Designer/Scratch Builder Join Date: Jan 1997 Location: St. Louis Intl, Missouri, United States Posts: 5,492	Thanks RCP! It is late weekend and I have looked at the model more. Firstly as it sits the intakes can feed a pair 90mm fans but the outlets aren't large enough....by a long shot. I then looked at the twin Minifan 480 size. The intake area is there but the minimum exhaust for such a large draggy model is about 58-59mm, at least for me. The model has about 50-51mm. The next step was to look at the doing it as a single high powered 90mm. This could work well and is something I discussed with Robert when I opened the box. A bifurcated 90mm exhaust is about 50-51mm. Now it is possible the make new exhaust cone and get either the twin 90mm or the twin Minifan480 to work but that isn't the path I want to take. Attached Thumbnails Measurement of the model outlet. 24.7 KB · Views: 1978 Measure of my old F-15 90mm outlet. 30.1 KB · Views: 2212 Trial fit into the lower aft fuselage. 30.6 KB · Views: 2439 Spar location. This 1/4" carbon rod passes through holes that I drilled. 26.5 KB · Views: 1828

Aug 07, 2006, 05:42 PM	#15
Kevin Cox Designer/Scratch Builder Join Date: Jan 1997 Location: St. Louis Intl, Missouri, United States Posts: 5,492	Parco, Yes it can be done in all the configurations that you listed. It will depend mostly on the amount of money you want to spend and how much work you feel like putting into it. Ed, You are correct on the cup things...I already have them but I'm still looking at other options. I have a pair of 730s but I was hoping to do something that others could copy if they wanted too (you know how hard they can be to get). Since I really want retracts I not rushing into it. But keep your ideas coming man! BTW, I have started to glue parts together . Last edited by Kevin Cox; Aug 07, 2006 at 05:51 PM.

Aug 03, 2006, 09:13 PM	#2
bruff Team EJF Team Hacker Join Date: Jun 1999 Location: Gilbert, Az Posts: 5,938	I have one also. It is on big bug! I'm going fixed gear route but twin Midi's on Hacker B50-12S motors. Bob

Aug 03, 2006, 11:31 PM	#4
nopistons96 who needs pistons? Join Date: Oct 2004 Location: mankato,mn Posts: 554	keeping an eye on this one. www.ejf.com $189.99

Aug 04, 2006, 10:07 AM	#5
nopistons96 who needs pistons? Join Date: Oct 2004 Location: mankato,mn Posts: 554	Hey Kevin, what is your plan on power setup?

Aug 05, 2006, 02:05 PM	#9
RCParkflyer Registered User Join Date: Nov 2003 Location: Racine, WI AMA# 809291 Posts: 5,817	Best of Luck Kevin!!

Aug 06, 2006, 03:35 PM	#12
Fossil1977 Flying Extraordinaire Join Date: May 2006 Location: The Sunny State Posts: 57	Wow, looks pretty cool eagerly waiting Flight time!!

Aug 07, 2006, 01:41 AM	#13
pacro TOPDOG Join Date: Oct 2003 Location: Taiwan Posts: 815	can this jet be built as twin minifan 480 or single 90mm or must it be twin 90mm

Aug 07, 2006, 10:58 AM	#14
Ed Waldrep Registered User Join Date: Dec 1996 Location: Las Vegas, NV Posts: 7,697	What about cutting the stock exhaust nozzle off and using some sort of plastic cup of the right size? Maybe a margarine container or those plastic single serving cereal containers, or something else? People may look at you funny when you are measuring things in the store buy hey! A single will make retracts easier as you know, wont have to rotate. What about a single HW750? Is there enough room? If not then a HW730? Of course that size fan is hard to come by...

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