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1:5.5 Grumman A6 (A, E, EA6A, F, KA6D) Intruder

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1:5.5 Grumman A6 (A, E, EA6A, F, KA6D) Intruder

Old 02-06-2021, 06:12 AM
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Flite-Metal
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Default 1:5.5 Grumman A6 (A, E, EA6A, F, KA6D) Intruder

Recommended Power: JetFan, Hacker 110 EDF/12s = 40# thrust for a 35# A6..
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Born from the semi-scale movie A6's. New three piece molds. Far from the original "Flight Of The Intruder" film A6's.
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Last edited by Flite-Metal; 02-06-2021 at 06:20 AM.
Old 02-19-2021, 03:38 AM
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Any recommendation for placement of our pair of JetFan 110 Pro?


Old 02-19-2021, 12:40 PM
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i tend to lean towards the rearmost end of your location bar.
get all the disruption to the airflow at once, and be done with that part.
Old 02-19-2021, 01:27 PM
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The position just ahead of the dog leg is what is proposed. I am waiting Rainer's reply.


Last edited by Flite-Metal; 02-19-2021 at 01:29 PM.
Old 02-19-2021, 01:44 PM
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It will make a very little difference where you place it, thrust-wise, from the pics above.
The more important thing is to place both power units in appropriate place to achieve the proper CG balance as you'll have to carry some serious battery load.
I would go as far back as the last pic. (R)
Old 02-19-2021, 02:17 PM
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Default MAC6's

Originally Posted by Joseph Frost View Post
It will make a very little difference where you place it, thrust-wise, from the pics above. The more important thing is to place both power units
in appropriate place to achieve the proper CG balance as you'll have to carry some serious battery load. I would go as far back as the last pic. (R)
Joseph,

...........................


That is the game plan. Balancing is not an issue with a 120" fuselage. However there is a lot going on mechanical wise in that area. Wing tube with half former galley on either side , bulkhead, retract rails with half former support, and of course these ducts. JetFan 110mm....each on 12s.



Rainer's test with a inlet ring but no exhaust duct produced 21.4#. AUW is estimated to be 34#. We created a three piece fuse mold for transportability vs. the movie fuselage which was nearly three times heavier than our layup. It was powered with twin ByroJet recip with two baseball bat pipes...and a large screen covered hole in the bottom to enable its flight off the Washington coast cliffs.


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Last edited by Flite-Metal; 02-19-2021 at 02:40 PM.
Old 02-19-2021, 05:53 PM
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Impressive looking model, couldn't these guys just catapult bungee launch it rather than chuking it off the cliff? Mate, I would expect the AUW lot more than 34#, by the time you'll finish it off, ready for its maiden. Looking forward to its premier flight.
Old 02-20-2021, 08:09 AM
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Default 1:5.5 Grumman A6 Intruder

Originally Posted by Joseph Frost View Post
Impressive looking model, couldn't these guys just catapult bungee launch it rather than chuking it off the cliff? Mate, I would expect the AUW lot more than 34#, by the time you'll finish it off, ready for its maiden. Looking forward to its premier flight.
Joseph,

We expect to weight right at 34~35# due to the fact our fuselage is 1/3rd the weight of the movie model. All but two movie 6's had no gear and weighed 22# . Bungee launches failed to reach adequate altitude for filming. Powered soaring permitted filming look-over-down perspective.
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Old 02-20-2021, 01:58 PM
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Unfortunately from my experience all AUW predictions failed, the end result was always heavier than planed, only the time will tell. You got a huge job ahead, good luck.
Old 02-20-2021, 03:31 PM
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Joseph,

Thanks...at this point there are few loose ends...well compared to a year ago. I am in that measure twenty times before second guessing what is about to be done. I have added leading edge slats, spoileron, and flaps to what was cosmetic representation of each. Up next is cutting the gear doors. Because only two of the movie 6's had landing gear...the other six A6 doors were air brushed... Guess which we have as a reference? 95% of the r/c film footage was flight with a 10 to 7 o'clock side perspective. Why they even considered gear is a mystery...the USN provided the USS Independence for two weeks of shooting onboard and air footage.

I have utilized multiple line drawings and the Trumpeter 1:32nd plastic model for a tie breaker when in doubt. The only real door issue is the multiple compound curves across straight cut lines and 16 inch long mains must remain parallel to centerline. In many ways the doors are more difficult than anything else. You don't get second chances cutting fiber glass. Made a paper template which is some help until laid across two compound curves Thanks to a pair of laser levels it won't be too bad.


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Last edited by Flite-Metal; 02-20-2021 at 03:41 PM.
Old 04-10-2021, 09:36 AM
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Default Then There Were Gear Doors





Last edited by Flite-Metal; 04-10-2021 at 09:54 AM.
Old 04-26-2021, 08:47 AM
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Next.......inside.



Old 05-19-2021, 03:47 PM
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Default Retract Door Cuts & Shape

I am pleased to post that there have been no shape changes on the cut out gear doors. Only cut the left side until I install bulkheads to
assure the symmetry. Until I create the vacuum formed door interior to prevent door oscillation I am using 1/4" carbon fiber rectangular
tube for T/C.

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Old 06-09-2021, 10:26 AM
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Default From~To...

Unlike the original with its piped 90 recip powered ByroJet pushers mounted forward with no inlet ducting this is replaced with an EDF cradle between a pair of half formers with an overhead wing tube galley. Ahead of this is a 105% FSA inlet and printed inlet duct.
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Rear bulkhead is 15" forward of exhaust outlet, forward one is 28" forward of the outlet. Inlet was CAD'd

From:



And

To:



Last edited by Flite-Metal; 06-09-2021 at 12:37 PM.
Old 06-25-2021, 01:36 PM
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Using the Edge "F" 160 HV esc on each of our JetFan 110mm 700-98-840 on 12S with a goal of 11 minute flight time...what would be the optimum battery @ ? C rate? I am considering use of 10,000 mah~12,000 mah.

At this level there have been conflicting claims to the best this or that, as best. I am frustrated in not finding real world data for this level of product. At the root of this is of course the A6's...but I will be powering two B-47E's with the same setup.

I will compete with both. 11 minutes is the ultimate goal in that during scale contests there are multiple contestants in the air at the same time. Each took off and land in sequence performing a back to back flight routine typically consuming 5 to 6 minutes.

The reason for the 11 minute goal is if a competitor attempting to land "ahead" of me were to end up doing a pin point landing in the middle of the runway. Yes, judicious throttle management is built into my flight routine working down from altitude performing maneuvers making best use of gravity.

In spite of well planned flight routines, things happen outside everyone's best choice of maneuvers against a maximum of 15 minutes with respect to the rules. In reality all maneuvers are typically performed under eight minutes takeoff to landing roll out.

Any and all recommendations are welcomed...YouTube witnessing preferred... ;^)

Last edited by Flite-Metal; 06-25-2021 at 10:08 PM.
Old 06-25-2021, 06:59 PM
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It's great to be an optimist but reality of EDFs tells me otherwise. You can only keep on dreaming of flight times mentioned above.
Old 06-25-2021, 10:04 PM
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Originally Posted by Joseph Frost View Post
It's great to be an optimist but reality of EDFs tells me otherwise. You can only keep on dreaming of flight times mentioned above.
Joseph,

The goal is to extend the go around contingency as much as possible. Eight maneuvers are typically performed back to back as much as possible in less than 5 to 6 minutes. That is a realistic expectation. The expectation is "not" 11 minutes...that is a # representing the extension of "time"...the subject of this post.
Old 06-26-2021, 12:06 AM
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3-4 minute flight time will be more realistic with the giant overweight electric powered model, especially if you expect protocol maneuvers. Hope, by the time you finish it they might come up with some new magic light batteries.
Old 07-11-2021, 05:32 PM
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Originally Posted by Joseph Frost View Post
3-4 minute flight time will be more realistic with the giant overweight electric powered model, especially if you expect protocol maneuvers. Hope, by the time you finish it they might come up with some new magic light batteries.
I have seen some edf twin A10's and 3-4 min and its time to land.
Old 07-11-2021, 11:37 PM
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Correct, from heavy wing loaders you can't expect much more flight time, 3-4 minutes is just about average flight time I get from any high powered composite EDF jet, single or multi powered, no matter what caliber fan.
An example, few of my heavy loaders, with minor mods to the wing tips to reduce the load improved things dramatically. The 80mm Fantom at 3.5kg is a bit of a flying brick so had to upgrade power to 7S, sucks amps like an open water tap!, so 3 min. is max with well managed th. on 4Ah packs.
The giant 12-13kg Hawk on 127mm, same story with 220A current draw.
You can easily work out any models flight time well in advance, by simple math calculation if you check your current draw.
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Heavy composite wing loaders, I'm laughing if I get 4 min. flight time with any of them.
Old 08-30-2021, 06:43 AM
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Default 9700's Initial Flight Results

The SMC 9700's are delivering 7 minutes with only two discharges...Both at 1/2 to 2/3rds throttle on a large Yellow F-18.
Flights resulted in 50% to 65% capacity remaining. JF-Hacker 110's. The 110's for the A6's are JF-HET powered which is
shown to have tested at 20% more thrust.

Last edited by Flite-Metal; 08-30-2021 at 04:58 PM.
Old 08-30-2021, 03:45 PM
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Well, run it on full stick to see what flight time you get.
Old 08-30-2021, 04:02 PM
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???????????? You know, or should know, that would be the worst thing to do with new packs, especially 12s2p..
What you suggest would be like stacking money up and taking a match to it.

Last edited by Flite-Metal; 08-30-2021 at 05:00 PM.
Old 09-12-2021, 03:46 PM
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32 year old "Flight Of The Intruder" film Grumman A6 spoileron servo works like new after surviving flooding
during hurricane Ike . Clk2C



Last edited by Flite-Metal; 09-12-2021 at 03:59 PM.
Old 09-13-2021, 04:14 PM
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Default A6 Panel Is Filling Out

Instrument panel is coming along. There are two base panel designs. One design for the A/E/EA and a second for the K (tanker). The left half of the panel is complete. This week we hope to have it completely finished.




Last edited by Flite-Metal; 09-13-2021 at 04:21 PM.

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