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Author Topic: Fly Fly 90mm Red Arrows Hawk  (Read 249 times)

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Offline Wingnutz

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Fly Fly 90mm Red Arrows Hawk
« on: November 22, 2019, 01:44:33 pm »
On TEMAC’s home page slideshow, there’s a great photo of a Fly Fly Red Arrows Hawk (Michael’s I think) landing on green grass spotted with dandelions...I’ve admired the model every time I see the photo...
I thought Fly Fly models were gone but I recently found out most are still available and since the Hawk is reputedly a great flying airframe (the resemblance between the Hawk and Sebart/Freewing’s Avanti is striking!), I pulled the order trigger...twelve days later, a huge box from Hong Kong.
For those of you not familiar with the Fly Fly 90mm EDF models, they’re old school (in EDF terms) EPS foam ARFs. They’re bigger, lighter and “less expensive?” than the current generation of PNP, RTF, BNF 90 mm EDFs.
EPS (beer cooler) foam makes them light but also means they’re not as strong as the newer EPO foam EDFs. Compared to EPO, easy to work on...great for modification...not so good at crashing!
Started with THE WINGS!
Started by sanding in a bit of dihedral...
SPARS
The wing halves have all the ribs and spars moulded in foam, with bottom skins to glue on when you’re finished messing around inside. The lack of strong spars results in wings which have a reputation for folding under stress...ask Michael about his Fly Fly F-86!...so I cut holes in the foam “ribs” and added two carbon fibre tube spars. I may add a carbon strip “swept” spar behind the leading edge of each wing.
FLAPS
Added these using Robarts pin hinges anchored in hard balsa “anchors” with the pins below the underside of the wing.
RETRACTS
Fly Fly used to supply air retracts but now supply the same servoless electric retracts that HK sells for EDFs. The wheels are a bit smaller than I’d like for grass field operation, but all three are trailing link and that seems to help on rough terrain. Cut larger 1/8” ply plates and sunk them into the rib/spar foam grid to allow the bottom skin to sit properly.
AILERONS
Supplied mounted (very sloppily) with strand tape...re-mounted with pin hinges.
BOTTOM SKINS
Supplied bottom skins on my Fly Fly F-86 started showing stress creases after only a few flights so for the Hawk, followed the advice on RCGroups and re-cut skins out of Dollar Store paper backed foam board.
No glue or paint yet...photos below! Rudder next.
« Last Edit: November 22, 2019, 06:11:52 pm by Wingnutz »


DOWN WITH GRAVITY!

Offline Frank v B

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Re: Fly Fly 90mm Red Arrows Hawk
« Reply #1 on: November 22, 2019, 05:37:31 pm »
Hey Mr. Nutz,

It's great to see you are active on the Forum again.  We sure missed your presence at the field this year.  Please drop by soon... like the Christmas Pilots' Meeting.
You must have a full year of insults pent up inside you.

Regards,

Frank

ps: Where is the usual Canadian beer bottle in these pictures.  How do we know they are your photos? ;) ;D
"Never trade luck for skill"

Offline Wingnutz

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Re: Fly Fly 90mm Red Arrows Hawk
« Reply #2 on: November 22, 2019, 06:07:45 pm »
Hey Mr. Nutz,

It's great to see you are active on the Forum again.  We sure missed your presence at the field this year.  Please drop by soon... like the Christmas Pilots' Meeting.
You must have a full year of insults pent up inside you.

Regards,

Frank

ps: Where is the usual Canadian beer bottle in these pictures.  How do we know they are your photos? ;) ;D

Hi Frank,
Obviously, I haven’t been taking many photos. I’ll try to do better and include the ever present beer bottle in the photos!😁
Weather permitting, I’ll try to make the Dec Pilots Mtg
« Last Edit: November 22, 2019, 06:15:36 pm by Wingnutz »
DOWN WITH GRAVITY!

Offline Wingnutz

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Re: Fly Fly 90mm Red Arrows Hawk
« Reply #3 on: November 27, 2019, 10:56:21 pm »
Got back to the bench for a while and cut the rudder out and hogged out the hole for sinking the rudder servo into the v. stab.. Man, those little foam cells end up everywhere...seems they’ve acquired a static charge and stick to any and everything!
I tried to order a blue one to do it up as a CT155 but had to settle for a Red Arrows colour scheme which with Callie’s help will be modified slightly to the 2019 Red Arrows scheme, the livery the Red Arrows used this past summer when they visited North America. The only significant change is the rudder scheme...
DOWN WITH GRAVITY!

Offline Wingnutz

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Re: Fly Fly 90mm Red Arrows Hawk
« Reply #4 on: November 30, 2019, 08:45:38 pm »
MOTOR MOUNTING
The motor and ESC arrived a couple of days ago and brought its own problems. I chose a Freewing 90mm 12 blade fan/motor from FW’s Venom as I really like whooshy sound it makes. The EDF shroud is flared on the intake side and the airways in the Hawk are designed for a non-flared EDF. So, more foam excavating to make the EDF fit. Again, foam cells everywhere!
ESC MOUNTING
Fly Fly provides a cavity for ESC mounting on the outside of the fuse, but it’s behind the wing and way too far back for getting the cg right. Did the same as I did on my FF F-86 and cut an ESC mounting hole in the top of the intake airway, ahead of the EDF. I’ll cut a “cheater” intake in the outer skin of the fuse and see if I can devise some kind of “cheese grater” intake grill to help achieve the Venom’s whooshy sound and allow air to get sucked over the ESC.
MOTOR HATCH
The fuse is designed so that left and right halves are glued together with the EDF already in place. With the limited hatch provided, the flared EDF is not going to come out so the hatch has been widened to allow the motor to be removed if that proves necessary.
« Last Edit: December 01, 2019, 04:29:31 am by Wingnutz »
DOWN WITH GRAVITY!

Offline Wingnutz

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Re: Fly Fly 90mm Red Arrows Hawk
« Reply #5 on: December 02, 2019, 11:04:51 pm »
NOSE GEAR
Following the RC Groups build thread, I cut a plywood plate to mount the nose gear retract and slotted the plate into the moulded formers in the fuse. The plate was extended forward to support the steering servo and the retract was re-configured to mount as shown. The rx battery and old rx in the photo are used to test operation of servos and retracts and clearances as I build. I’ll use the 10ch rx once it shows up. The fuse is resting on a 3” foam pad which helps prevent hangar rash while building...especially important with soft EPS foam that's already painted!
« Last Edit: December 02, 2019, 11:13:37 pm by Wingnutz »
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Offline sihinch

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Re: Fly Fly 90mm Red Arrows Hawk
« Reply #6 on: December 03, 2019, 04:41:47 pm »
That looks like the same gear I used on my FlyFly Phantom, Bill. If I could do it again, I'd use something with a stronger pin...
« Last Edit: December 03, 2019, 04:45:12 pm by sihinch »

Offline Wingnutz

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Re: Fly Fly 90mm Red Arrows Hawk
« Reply #7 on: December 03, 2019, 06:01:37 pm »
That looks like the same gear I used on my FlyFly Phantom, Bill. If I could do it again, I'd use something with a stronger pin...
Simon,
That’s a beauty! Must have been sleeping if that one has been here on the forum already.
Do you remember if your pin is 4mm or 5mm? The one I’m using is 5mm and it looks pretty sturdy. Thanks for the heads up!
DOWN WITH GRAVITY!