Javron progress.

[skywagon8a]

Skywagon
I was thinking of doing someone similar as I progress with my build using duct tape where fabric will go do you or anyone else have a ideal of how many layers for medium fabric with a medium tape and paint on top of that?
DENNY

Remember at the edges, the thickness will be double as there is a reinforcing tape at all the edges. That should cover it, the paint will be a small percentage of that.

 

[rv6ator]

Belly panel with ads-b & txp antennas installed.

Lower cowling. Removing the CF extractors provides good maintenance access without having to remove lower cowling

 

[CKearns]

One of the things I have left to do on the bottom cowl is make the lip that hangs down to create low pressure to help pull air out of the cowl. This was recommended to me by others but I see you do not have one. There is not much room left when using Clint's exhaust since you have to open the bottom up so much. What are people's thoughts on this?

Thank you,
Charlie

 

[rv6ator]

Charlie,
My Vetterman exhaust is 2 muffler crossover w/ heat muffs. I am working on exhaust bracing as we speak and will post pics when finished. It is a bit of a tight fit, but there is plenty of adjustment in the system.
I did not install any lip or scoops on the lower cowl, but rather installed CF "air extractors", to hopefully pull air from the cowling. Flight testing will determine their effectiveness. Part or all of the extractors can be closed off for winter operations. Additionally I added a cockpit adjustable shutter on the oil cooler. I also added inlet ramps to the top portion of the nose bowl to smooth out the inlet airflow. These are standard on most RV's and work well.

 

[rv6ator]

Striping 3M 2080 vinyl, Cassie and Jake's handywork, took about 3 hours.

 

[cubdriver2]

Striping 3M 2080 vinyl, Cassie and Jake's handywork, took about 3 hours.
View attachment 68573
View attachment 68574

Yikes, I might get into the wrong Cub by mistake......a few times

Glenn

 

[acroeric]

Excited to hear how it cools. Working on my Javron cowling and my lower exit area is very similar. Same engine/ exhaust etc.

Also- Where did you get your cowling latches? I see some very expensive Univair options and some much cheaper ones elsewhere.

 

[rv6ator]

E-Bay
Good quality latches.

 

[acroeric]

That is what I was hoping! Thank you.

 

[rv6ator]

Removable CF panel below rear seat to minimize draft and
hopefully to keep crap from dissapearing into the belly to a minimum
k

 

[Bill Rusk]

Excellent idea and very well done!! Love it.

Bill

 

[rv6ator]

Bill,
Your Javron build thread has been a huge help in building and configuring my Super Cub. Must reading for anybody building or restoring. I know an inordinate amount of time was spent organizing and posting your progress.
Thank You!
Bill

 

[rv6ator]

Cowling installed.

 

[Bearhawk Builder]

Really nice build! Makes me want to build another SuperCub.
Where did you source the Piper cowl latches? Does Jay have these or Univair?

Oops, just saw your previous post

 

[49_sedan]

Absolutely beautiful workmanship! Hope to see it in person soon.

 

[rv6ator]

Windshield installed. Jay's fairing fit great, no trimming.

 

[rv6ator]

Did a preliminary W&B, looks like around 1130# on 8:50's and 1180# on HT 31" BW's. C.G. also looks good.

 

[skywagon8a]

Did a preliminary W&B, looks like around 1130# on 8:50's and 1180# on HT 31" BW's. C.G. also looks good.

Do you have a number for "looks good"?

 

[rv6ator]

I am using the Cubcrafters CC18-180 "approved" flight and operating manual as a reference for my W&B. I am using the Javron 2200# G.W. as opposed to the CC's 2300#. All the W&B stations seem correct, with the exception of the tailwheel, since I am running a Baby B.W..
Datum location for the CC is located 60" fwd of wing leading edge vs. leading edge. Unlike many other aircraft, the PA-18 does not have an empty weight C.G. range, but rather an in-flight envelope from 70.5"- 81". Looks like the empty C.G. will be around 70". Fuel/pax & cargo will move the C.G. aft. Once a final weighing is performed I will run all loading scenarios. I do not believe I will need any tail ballast. Will keep you posted.

 

[rv6ator]

I am using the Cubcrafters CC18-180 "approved" flight and operating manual as a reference for my W&B. I am using the Javron 2200# G.W. as opposed to the CC's 2300#. All the W&B stations seem correct, with the exception of the tailwheel, since I am running a Baby B.W..
Datum location for the CC is located 60" fwd of wing leading edge vs. leading edge. Unlike many other aircraft, the PA-18 does not have an empty weight C.G. range, but rather an in-flight envelope from 70.5"- 81". Looks like the empty C.G. will be around 70". Fuel/pax & cargo will move the C.G. aft. Once a final weighing is performed I will run all loading scenarios. I do not believe I will need any tail ballast. Will keep you posted.

FYI
I am running a YO-360C1A, turning a Catto 84/43 (15 lbs.). Lightweight starter & alternator.

 

[skywagon8a]

I like to fool with numbers on a spreadsheet. This is my W&B calculation for your Cub. You are within 1/8" of the forward limit with any sized pilot from 100 - 220 lbs. And can carry up to a 330 lbs passenger with full baggage. You could have a 250 lb pilot, a 330 lb passenger, full baggage and still be under 2200 lbs within the aft limit. Looks like an empty CG of 70" is your sweet spot.

rv6ator's Cub​	Weight​	Arm​	Moment​	​	​
empty​	1130​	70​	79100​	​	​
Fuel​	0​	84​	0​	​	gallons​
Pilot​	0​	71​	0​	​	​
passenger​	​	97​	0​	​	​
Baggage​	​	117​	0​	​	​
#2 baggage​	​	153​	0​	​	​
​	1130​	70.00​	79100​	​	​
​	​	​	​	​	​
Most Forward CG​	​	​	​	​	​
empty​	1130​	70​	79100​	​	​
Fuel (48 gal)​	48​	84​	4032​	8​	gallons​
Pilot​	170​	71​	12070​	​	​
passenger​	​	97​	0​	​	​
Baggage​	​	117​	0​	​	​
#2 baggage​	​	153​	0​	​	​
​	1348​	70.62​	95202​	​	​
​	​	​	​	​	​
Most Aft CG​	​	​	​	​	​
empty​	1130​	70​	79100​	​	​
Fuel (48 gal)​	288​	84​	24192​	48​	gallons​
Pilot​	170​	71​	12070​	​	​
passenger​	170​	97​	16490​	​	​
Baggage​	180​	117​	21060​	​	​
#2 baggage​	20​	153​	3060​	​	​
​	1958​	79.66​	155972​	​	​
​	​	​	​	​	​
​	​	​	​	​	​
Limits @1600 lbs​	70.5” – 81.0”​	​	​	​	​
Limits @2200 lbs​	77.9” - 81.0”​	​	​	​	​

 

[rv6ator]

I like to fool with numbers on a spreadsheet. This is my W&B calculation for your Cub. You are within 1/8" of the forward limit with any sized pilot from 100 - 220 lbs. And can carry up to a 330 lbs passenger with full baggage. You could have a 250 lb pilot, a 330 lb passenger, full baggage and still be under 2200 lbs within the aft limit. Looks like an empty CG of 70" is your sweet spot.

rv6ator's Cub​	Weight​	Arm​	Moment​	​	​
empty​	1130​	70​	79100​	​	​
Fuel​	0​	84​	0​	​	gallons​
Pilot​	0​	71​	0​	​	​
passenger​	​	97​	0​	​	​
Baggage​	​	117​	0​	​	​
#2 baggage​	​	153​	0​	​	​
​	1130​	70.00​	79100​	​	​
​	​	​	​	​	​
Most Forward CG​	​	​	​	​	​
empty​	1130​	70​	79100​	​	​
Fuel (48 gal)​	48​	84​	4032​	8​	gallons​
Pilot​	170​	71​	12070​	​	​
passenger​	​	97​	0​	​	​
Baggage​	​	117​	0​	​	​
#2 baggage​	​	153​	0​	​	​
​	1348​	70.62​	95202​	​	​
​	​	​	​	​	​
Most Aft CG​	​	​	​	​	​
empty​	1130​	70​	79100​	​	​
Fuel (48 gal)​	288​	84​	24192​	48​	gallons​
Pilot​	170​	71​	12070​	​	​
passenger​	170​	97​	16490​	​	​
Baggage​	180​	117​	21060​	​	​
#2 baggage​	20​	153​	3060​	​	​
​	1958​	79.66​	155972​	​	​
​	​	​	​	​	​
​	​	​	​	​	​
Limits @1600 lbs​	70.5” – 81.0”​	​	​	​	​
Limits @2200 lbs​	77.9” - 81.0”​	​	​	​	​

Skywagon8a,
Thank you for running the numbers. We are on the same page.

 

[RaisedByWolves]

13-14” or 73-74 is the sweet spot for empty cg I had to add 10lbs at 200” and my tool and tie down of 25lbs at the back of the extended baggage that brings the empty cg to 15.2 or 75.2 if you want to run around light and be able to use the brakes at all. Take that tool bag out and I can use about half the brakes, take the ballast out and I can use about 5% of the brakes. That’s running around light on fuel and no junk in the airplane.

 

[rv6ator]

Wing root fairings and VHF antenna.

 

[rv6ator]

Finally got the bird to the hangar, we managed it without doing any damage.

 

[RaisedByWolves]

Already got bugs on the cowl. Looks great

 

[acroeric]

Looking great! That will be one of the perfect mixes of airplanes. A Super Cub and a RV.
Where did you get your flap gap seals? I need to get a set for mine.

 

[rv6ator]

Flap gap seals are from Javron.

 

[Bill Rusk]

Very nice. Congrats. You are going to love it.

 

[rv6ator]

Empennage installed w/gap seals.