Avon Flyers Forum Home - Curtis Hawk 75

yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Curtis Hawk 75 Jul 31^st, 2015 at 4:26pm The poor weather the past few week prompted me to start my 'winter' build early. I wanted sonething a little different but a kit build so I settled on the Hawk 75 / p36. I picked up the top flight p40, ordered decals from Callie. Retracts and dle20 should be here soon. I chose the scheme from the cover of one of my books. Should be easy to see.
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #1 - Jul 31^st, 2015 at 10:07pm That will be a neat kit bash Marc...looking forward to it..
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administrator Yabb Administrator Rocker 148 !! Offline Zoom Zoom!! LastOn: Jan 19^th, 2024 Join: Apr 11^th, 2009 Posts: 850 Reputation: 0 Windsor, Nova Scotia Gender: Zodiac sign: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #2 - Jul 31^st, 2015 at 10:20pm Hi Marc: It's a beauty. Hope you post pictures of the build. It's an interesting subject and I'm sure lots od guys would like to follow it. Bruce
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #3 - Aug 20^th, 2015 at 5:59pm Before packing up my shop for the shop 2.0 upgrade 😃 I did get the tail framed and lightened. Carved out the fuse formers as well. Currently the project is in mothballs untill the TV room and shop are completed.
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #4 - Aug 20^th, 2015 at 8:24pm Good start..
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Re: Curtis Hawk 75
Reply #5 - Nov 8^th, 2015 at 1:13pm

Building season is here so I started back on this project.
I sheeted the top of the wing. I read that there were some issues with tip stalling so I ensured there was 2° of washout at the tips.

I cut the front fuselage formers to where i wanted the firewall to be and made a new firewall . I built up the sides for the start of the transition to the radial cowl.

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Yak Man Club Member Galactic Twinkie Jet Pilot Extraordinaire Offline Forum User LastOn: Today Join: Mar 23^rd, 2010 Posts: 1,000 Reputation: 0 Gender: Zodiac sign: Awards: 5 Mood:	Re: Curtis Hawk 75 Reply #6 - Nov 8^th, 2015 at 6:42pm I like it! Keep it going man.
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dano Aerobatic Pilot The Avon Splish Splash!! Offline Forum User LastOn: Feb 25^th, 2020 Join: Jul 7^th, 2011 Posts: 429 Reputation: 0 Kingston, NS Gender: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #7 - Nov 9^th, 2015 at 8:29am Nice subject Marc! Building different models is what keeps the interest alive!
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #8 - Nov 11^th, 2015 at 7:46pm Starting to look like a plane now. Basically stock kit build at this point. Haven't decided on how i am doing the nose. Thinking of two piece cowl for easy access to the engine, but single piece would be easier. Leaving this decision until later.
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #9 - Nov 11^th, 2015 at 10:35pm looking good Marc
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #10 - Nov 17^th, 2015 at 6:45pm Finished sheeting the fuse and made the wing fillets. Rough sanded the cowl. Went with the two piece for engine access. Time for the boring stuff. Cutting hatches, installing hinges and controls, setup the retracts. .
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #11 - Nov 17^th, 2015 at 6:46pm Engine access
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #12 - Nov 17^th, 2015 at 6:46pm Cowl
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #13 - Nov 17^th, 2015 at 7:24pm Well done Marc
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Yak Man Club Member Galactic Twinkie Jet Pilot Extraordinaire Offline Forum User LastOn: Today Join: Mar 23^rd, 2010 Posts: 1,000 Reputation: 0 Gender: Zodiac sign: Awards: 5 Mood:	Re: Curtis Hawk 75 Reply #14 - Nov 18^th, 2015 at 6:40am That's one cool plane you have there! Nice job! Looking forward to seeing it.
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administrator Yabb Administrator Rocker 148 !! Offline Zoom Zoom!! LastOn: Jan 19^th, 2024 Join: Apr 11^th, 2009 Posts: 850 Reputation: 0 Windsor, Nova Scotia Gender: Zodiac sign: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #15 - Nov 18^th, 2015 at 10:50pm Great job Marc!!! Your going to glass it an paint? Bruce
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #16 - Nov 19^th, 2015 at 8:11pm I am going to glass with water based polyurethane, then paint.
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Re: Curtis Hawk 75
Reply #17 - Nov 20^th, 2015 at 6:03pm

Discovered that I was out of glass cloth and fabric, so placed an order for some. Now to putter around until it gets here.

Started on the retracts. The new e-flite 95° 60-120 retract footprint is a little longer than the air retracts they were designed for. I moved the retract mount position forward and cut a relief hole for the endplate wires into the spare shear web. Moving forward will help with nose over's and the end caps still fit over the units.
I added some cross grain balsa to beef up the wheel well edges so they can take some ware n tear.

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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #18 - Nov 20^th, 2015 at 6:04pm Wheel well cross grain.
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #19 - Nov 20^th, 2015 at 8:41pm looking good Marc
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #20 - Nov 29^th, 2015 at 12:39pm Glassed the plane with wpu. I experimented with a slurry of DAP lightweight filler and wpu to fill the weave. It was easy to sand, seems to work but time will tell if it holds up the the vibrations I covered and hinged the controls.
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #21 - Nov 29^th, 2015 at 3:28pm sounds like a good idea Marc. In the "old days" we sometimes put the .75oz cloth on with primer...saved weight and worked fine... maybe not quite as strong, but philosophy was - if not strong enough, nothing was going to be anyway..
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Re: Curtis Hawk 75
Reply #22 - Dec 13^th, 2015 at 6:56pm

Haven't done much the past few weeks as life has been busy. I spent some time centering the engine in the cowl and making the standoffs.
I installed the control horns and aileron servos. I added covering over the control surface gaps. No air bleed through here.
I picked up a partially completed TopFlight P40. Haven't decided if I will make it into another variant of the p36, or keep it as a p40.

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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #23 - Dec 13^th, 2015 at 6:57pm Cowl gun covers
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Re: Curtis Hawk 75
Reply #24 - Dec 24^th, 2015 at 8:36am

Need some advise from the gas guys.

I was planning on using 3s lipo battery with a voltage regulator for ignition and rx. The only suitable place for the battery will be above the gas tank. I don't want to have to remove the tank every day to charge/replace the battery.

I am thinking of making 2200mah 6v NiHd battery pack and mount into the plane. Would this be enough to power the rx and ignition for a day of flying? I would like to have 2-3 hrs of flight time on a pack.

Marc

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Glen Club Member Offline Forum User LastOn: Today Join: Aug 5^th, 2011 Posts: 441 Reputation: 2 Sackville Gender: Zodiac sign: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #25 - Dec 24^th, 2015 at 12:46pm Call me old fashioned, but I still use separate batteries for each Marc. If you're really determined to only have one pack, go with the lipo/regulator simply for the fact that it will have more power than the same size nicad/nimh pack.
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #26 - Dec 24^th, 2015 at 2:04pm I used to use two packs until my rx power failed and my plane powered into the ground. If i am going to loose rx, I want the engine to quit too. I am trying to keep as much weight up front and the only real room left is above the gastank so i don't want to bury a lipo there. M
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Glen Club Member Offline Forum User LastOn: Today Join: Aug 5^th, 2011 Posts: 441 Reputation: 2 Sackville Gender: Zodiac sign: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #27 - Dec 25^th, 2015 at 2:29pm Well Marc, I'd probably bolt my motor down and run a full tank out using whatever battery you choose, then you'll know how much juice it uses. I've read that some of the smaller engines use as much and more battery power than some of the larger ones, so its worth knowing.
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Re: Curtis Hawk 75
Reply #28 - Dec 25^th, 2015 at 3:57pm

That is a good idea to run a tank and measure the pack.
I figured with a lower voltage pack I may need more capacity, just not sure how much.
Thought about doing two 6volt packs in parallel or making one higher voltage pack with a regulater but didn't want to add too many heavy batteries.
Guess I still think of weight in terms of small foamies.

Marc

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Re: Curtis Hawk 75
Reply #29 - Dec 27^th, 2015 at 2:31pm

I finished installing the servos and mounted the engine. Just need to figure out the battery and a few more things.
Started prepping for painting but I end up knocking a steel plate off the workbench and onto the wingtip Angry

waiting on the patch to dry now. Gotta say I was lucky there was not a lot of damage as it landed on the wingtip spar.

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JackDD Club Member Offline Forum User LastOn: Today Join: Apr 25^th, 2010 Posts: 541 Reputation: 0 Gender: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #30 - Dec 28^th, 2015 at 7:24am OOps any pics
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Re: Curtis Hawk 75
Reply #31 - Dec 28^th, 2015 at 5:03pm

No pics of the damage. I see nothing Lips Sealed

Most thing done were internal. Only external thing is the exhaust pipes. I tried to make some plastic ones from a mold. That failed miserably so I went old school. Now have hollowed out balsa. This gives less exit air than I wanted but every little bit should help.
Last summer I bought a cheap paint gun from Princess Auto, so I thought it was time to give it a try. Picked up some house paint in quart cans and managed to apply the underside paint.

M

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Re: Curtis Hawk 75
Reply #32 - Dec 29^th, 2015 at 1:55pm

Marc - FWIW. I've been flying my IMAC planes now for 6 or 7 years with only 1 2s pack...2200 LIFE. Newer Rx and servos can handle that voltage, as can the newer ignitions. You absolutely don't need 3s.

This arrangement did save my plane once. I was flying in a contest when the engine quit. I dead stuck (sticked) (stacken) in no problem. then the engine didn't want to restart. Later found out the pack was failing, and since the ignition needed more voltage than the flight pack, IT quit first. FWIW

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Re: Curtis Hawk 75
Reply #33 - Dec 30^th, 2015 at 5:28pm

I like the idea of the Life pack. I plan on making 'shelf' above the engine for lead, ignition box, and if room for a battery.

I painted the plane using house paint and spraygun. I really like this method. Low odour and dries fast.
Did a bit of weathering, didn't want to over do it. I was not able to find good pics of weathering.
I couldn't resist adding the Callie graphics. I really like the look so far.

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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #34 - Dec 30^th, 2015 at 8:12pm superb...
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Ben Lann Aerobatic Pilot Offline Forum User LastOn: Aug 11^th, 2023 Join: Aug 15^th, 2011 Posts: 275 Reputation: 1 New Glasgow, NS Gender: Zodiac sign: Mood:	Re: Curtis Hawk 75 Reply #35 - Dec 31^st, 2015 at 1:06pm Very impressive paint job!
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Re: Curtis Hawk 75
Reply #36 - Jan 9^th, 2016 at 12:51pm

I took Sandy's advice and bought a Lifo 2s 2100mah battery and a charger. Wrapped the battery in bubble wrap and installed it above the gas tank. The battery has two built in power leads so I can plug right into the ignition and the rx.
I wanted to balance the plane so I can figure out how much lead I need in the nose. Put everything in position to discover my wheel hubs are too wide for my axles. At least I was able to balance. Will need less lead than expected

Now to get it securly mounted.

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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #37 - Jan 9^th, 2016 at 1:17pm I'm in trouble now....
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yorcram Club Member Offline Forum User LastOn: Apr 23^rd, 2024 Join: Mar 12^th, 2015 Posts: 279 Reputation: 0 Sackville,NS Gender: Awards: 1 Mood:	Re: Curtis Hawk 75 Reply #38 - Jan 23^rd, 2016 at 1:15pm Well, it's ready for a maiden. I had been waiting on struts but they are still on backorder so I used the eflite struts. Came in at 10.1 pounds so I am happy with that. Marc
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #39 - Jan 23^rd, 2016 at 1:19pm Very nice Marc
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Yak Man Club Member Galactic Twinkie Jet Pilot Extraordinaire Offline Forum User LastOn: Today Join: Mar 23^rd, 2010 Posts: 1,000 Reputation: 0 Gender: Zodiac sign: Awards: 5 Mood:	Re: Curtis Hawk 75 Reply #40 - Jan 25^th, 2016 at 6:15am That's a pretty plane Mark. Looking forward to seeing it soon. You should bring that to the meeting coming up.
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MkIX Club Member Offline One seat, one engine, guns.... LastOn: Jan 31^st, 2024 Join: Jan 29^th, 2012 Posts: 320 Reputation: 1 Bedford Gender: Zodiac sign: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #41 - Feb 7^th, 2016 at 11:03am What a great looking plane. I especially like the paint scheme; something different. In an earlier post you mentioned painting it with house paint; I'm assuming that means latex. How did you fuelproof the paint I look forward to seeing it at the field.
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #42 - Feb 7^th, 2016 at 12:54pm Mike, latex doesn't require proofing against gasoline, just nitro
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MkIX Club Member Offline One seat, one engine, guns.... LastOn: Jan 31^st, 2024 Join: Jan 29^th, 2012 Posts: 320 Reputation: 1 Bedford Gender: Zodiac sign: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #43 - Feb 7^th, 2016 at 2:46pm One more thing in favour of gas. At some point I gotta get with the program
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,089 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Curtis Hawk 75 Reply #44 - Feb 7^th, 2016 at 3:05pm http://vaillyaviation.com/Intro.html try here, great 2 piece article
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JackDD Club Member Offline Forum User LastOn: Today Join: Apr 25^th, 2010 Posts: 541 Reputation: 0 Gender: Awards: 2 Mood:	Re: Curtis Hawk 75 Reply #45 - Feb 8^th, 2016 at 11:16am great job, Mark...we should have a Maiden day at the club this spring,,
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