Composite BAE-Hawk Modified Build - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-13-2015, 10:05 PM   #1
G-RIDE
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Composite BAE-Hawk Modified Build


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Purpose:
Jet takeoff and landing performance on a grass runway.
I'm looking for jet scale (AOA-FPA-Vs1) performance and don't care about top speed.

Engineering paradigm:
Reduce weight. Fly 90mm - 12 blade on 1600kv//6s.

Project:
Exclude manufactures intake duct system (save weight). Canopy latch hard deck (ease of battery access). Extra strong landing gear (he-he).

Logic (see pics): The HK composite 90mm Hawk affords over sized none scale intakes combined w/a large interior volume that I hope will allow plenty of air to the shroud intake lip (I'll be adding a fairing to the bulkhead in front of the motor) - Also excellent cooling for the cc100a esc.

I'm also interested in +/- benefits of scale wing fences and vortex generators at this scale level: WS=1140mm, weight=2600g..

Did I mention this is my first rc edf jet (?!)

All comments are welcome. Thnx//g.
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Old 11-14-2015, 08:00 AM   #2
4stripes
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Re: Composite BAE-Hawk Modified Build

Welcome to the world of EDF jets! First jet being the composite Hawk would not be my choice as it is fast with lest than optimal stall characteristics. Why not fly a foam jet RTF while you build this advanced model? The things you learn form the first jet is usually paid for with crashes.
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Old 11-14-2015, 09:18 AM   #3
G-RIDE
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Re: Composite BAE-Hawk Modified Build

4stripes> I'm not worried - You offered to maiden this project when it's finished.

Any opinion on the proposed build modifications?
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Old 11-14-2015, 11:58 AM   #4
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Re: Composite BAE-Hawk Modified Build

Personally I would use the ducting. More efficient airflow will equal better performance and less throttle needed to cruise around (with longer flight times).
Can you refresh my memory as to when I offered to maiden a HK Hawk? Even I'm a little scared of that plane with its higher wing loading! The wing fences likely help but who knows unless you try with and without.
The FW T45 would likely have been a better choice for a hawk with its leading edge slats.
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Old 11-14-2015, 01:14 PM   #5
G-RIDE
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Re: Composite BAE-Hawk Modified Build

EK> You invited me down to your club for the maiden last fall - Maybe I assumed you'd want to fly it. Not a problem - Thanks for your input on the mods.
Happy Flying. //g.
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Old 11-14-2015, 02:43 PM   #6
4stripes
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Re: Composite BAE-Hawk Modified Build

When you need to use the paved runway let me know. We can have guests as long as they bring their MAAC card.
I still think it is a poor choice for a first jet. Maybe a third or fourth jet... The Hawk design is not the jet trainer some might expect. When built large and light it can be OK but the HK version is small and heavy much like the epic failure eflight made in the past.
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Old 11-14-2015, 04:57 PM   #7
G-RIDE
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Re: Composite BAE-Hawk Modified Build

Thnx E> I agree. Hence, the projects weight reduction at the expense of top speed performance. Thank you for the invite. //g.
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Old 11-14-2015, 05:13 PM   #8
4stripes
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Re: Composite BAE-Hawk Modified Build

The performance increase from decent ducting will outweigh the penalty of extra weight. They put it in for a reason. I'm not concerned with speed either. Just talking about better thrust for times you need it and reduced power consumption for better flight times.
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Old 11-14-2015, 09:07 PM   #9
G-RIDE
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Re: Composite BAE-Hawk Modified Build

I hear ya. . The interior shape appears to be smooth and efficient w/ mods..

BAE/mods:
1 -Remove rudder servo fr tail position. Install DS821 servo at nose retract position to power N/W steering w/ nirod control hook-up for rudder.
2 -Naca fairings added to B-5 to improve airflow to engine intake (w/o ducts).

I'll post test sled static performance data next week. //g.
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Old 11-15-2015, 01:06 PM   #10
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Re: Composite BAE-Hawk Modified Build

Good luck Mike, new projects are always fun and a challenge. But I have to agree with Eric on getting a foam backup plane that is faster to assemble to test your skills on. I would suggest something like the 90 mm Fly Fly F-86 Sabre. You can use most of your electronics, EDF unit and retracts in it, as it is a pretty big airframe. Also, numerous chaps on this forum have built and flown them and can offer lots of advise. If you just built it to fly and not go into scale features, it will be a reasonably quick build.

I designed and manufactured a 70 mm version of the Hawk and trust me, it's not a trainer. There was no forgiveness with it, and the finished wieght including the batteries was only around 45 oz. By all means, build the Hawk as best you can, get advise from the chaps here, but save it for when you become comfortable with jets. It'll save you money and frustration.
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