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Old Nov 22, 2011, 01:33 PM
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Dr Honda's Avatar
Pittsburgh Allegheny, Pennsylvania, United States
Joined May 2004
1,166 Posts
Hi Herb,

Thanks for the input. I followed the link to the German site, and it seems that both crashes were from non-turbine issues. The Original post'ers model went in because of bad handling after he ran out of fuel. (he put his flaps down, and lost all his speed) And the second one... from what I can tell with the translation... is that his radio failed. The translation came back as "It drifted away."


Well.......................

I bought it for a small turbine, and I really have no interest in building it as an EDF. So, if it doesn't work out... I guess it will be for sale.

As I was saying above... I'm not a "Jet Jock"... I just like to play with turbine engines. (lol) But you are right in saying that the wing loading may be too high when it's full of fuel.

Question... What is the flying weight of your EDF version. (with batteries) I guess that will be my max target weight. (with fuel)
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Old Nov 22, 2011, 01:44 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
2,346 Posts
Quote:
Originally Posted by Dr Honda View Post
On my falcon (which is also over powered) When I hit full flaps with crow... I have to keep about 10% power on to keep it moving forward. This also keeps it predicable at lower speeds.
This reminds me of when I switched from flying the low wing Pipers to the high wing Cessnas. The flaps on the Piper were manual and with a long lever and a long travel (kinda like a hand brake in a car), while the Cessna had an electric, short travel switch. Once, as I was coming in for landing, instead of dropping only 10 degrees of flaps on downwind, I hit the switch all the way to 40 degrees. I can almost swear the plane stopped in the air...
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Old Nov 22, 2011, 01:46 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
2,346 Posts
Quote:
Originally Posted by Dr Honda View Post
Hi Herb,

Thanks for the input. I followed the link to the German site, and it seems that both crashes were from non-turbine issues. The Original post'ers model went in because of bad handling after he ran out of fuel. (he put his flaps down, and lost all his speed) And the second one... from what I can tell with the translation... is that his radio failed. The translation came back as "It drifted away."


Well.......................

I bought it for a small turbine, and I really have no interest in building it as an EDF. So, if it doesn't work out... I guess it will be for sale.

As I was saying above... I'm not a "Jet Jock"... I just like to play with turbine engines. (lol) But you are right in saying that the wing loading may be too high when it's full of fuel.

Question... What is the flying weight of your EDF version. (with batteries) I guess that will be my max target weight. (with fuel)
I'm at 7.82 lb AUW with 6S 5000mAh battery and flight battery.
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Old Nov 22, 2011, 02:03 PM
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Dr Honda's Avatar
Pittsburgh Allegheny, Pennsylvania, United States
Joined May 2004
1,166 Posts
Thanks. I guess that's my target weight. Just under 8 Lbs.

Once the kit gets here... I'll just weigh everything.
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Old Nov 22, 2011, 04:28 PM
Fly Low Fly Fast Fly Often
jjr2001's Avatar
Glendale, Arizona
Joined Jul 2007
843 Posts
Quote:
Originally Posted by Dr Honda View Post
Thanks. I guess that's my target weight. Just under 8 Lbs.

Once the kit gets here... I'll just weigh everything.
Mine is 7lbs 1 ounce. With retracts and a 6S 4900mah 25C Rhino.
HS85 and BlueBird BMS373 servos..Castle Ice 100. Pulling 75 amps WOT.

Oh yea, I left out the inlet ductwork!!!!! I know, I know, you need them for smooth air-flow........

Well I did not want a plane that would not get out of it's own way like my Fly Fly F100...20 flights and that was it.....

So, I used a splitter, mounted the ESC on the splitter so it gets airflow from both sides, used the inlet ring on the fan and I saved about 5 or 6 ounces of flying weight.


How does it work? Well I have 5.25 lbs of thrust on the thrust stand and 5.0 lbs of thrust in the plane all ready to fly.

Climbs to about 400' at an 80 degree angle in about 3 seconds....

Enough jet action for this old dude....He He
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Old Nov 22, 2011, 11:10 PM
chillax! It's only a Hobby
1moparman1's Avatar
United States, CA, Millbrae
Joined Apr 2011
418 Posts
Herb:
I am new at this,your blog was great!
just want to tell you it help me with many issues!
i have a sapac t-45 in the box that i will get to soon!!
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Old Nov 23, 2011, 01:29 PM
1.21 Gigawatts!
Steph280's Avatar
Irvine, CA, USA
Joined Oct 2000
7,347 Posts
Herb,

How's the quality on those SonicElectric struts? Do you think they will handle the 7-8lbs weight of this T-45? Or are they similar to the cheap $28 ones from Hobby King which you show in your original build photos?
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Old Nov 23, 2011, 05:23 PM
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Herb's Avatar
Irvine, Calif USA
Joined Feb 1999
12,133 Posts
No comparison to the flimsy parkflier struts you are referring to. These are much stronger, and the spring is stiffer too.

http://www.sonicelectric.com/Merchan...ory_Code=LDERS

.
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Old Nov 23, 2011, 07:35 PM
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Irvine, Calif USA
Joined Feb 1999
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Quote:
Originally Posted by jjr2001 View Post
Mine is 7lbs 1 ounce. With retracts and a 6S 4900mah 25C Rhino. HS85 and BlueBird BMS373 servos..Castle Ice 100. Pulling 75 amps WOT. ...
I just weighed mine, 8.1 lbs rtf with 8S 3000's, 120A hv esc and strobe etc.

I like your setup ! I am a great fan of Bluebird servos, they are top notch!! In my second Hawk I am using the BMS 375MG digitals on the ailerons

http://www.hobbyking.com/hobbyking/s...sec_11_4g.html

and some less expensive HS-82 MG clones on the flaps. HS-55's for the dual elevators.
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Old Nov 23, 2011, 07:57 PM
They call me Crash!
Kaw1000's Avatar
Ohio
Joined Jun 2006
1,692 Posts
Quote:
Originally Posted by Herb View Post
We shall see on that motor ... I already thought their $19 inrunner motor B36-56 was pretty good in the Midifan, lasted me two years of continuous flying abuse on 6S Bought even a backup that I never used.

CMP T-45 now on sale at $139 :

http://www.nitroplanes.com/cmpfitedfjet.html

They still have the T-45 struts where I got them a year ago:

http://www.sonicelectric.com/Merchan...ory_Code=LDERS

( ERS-Strut-G )

Exactly which retracts on this page are the right ones?...I'm new to retracts,
what else do you need to complete the retracts? Struts?...if so which ones?
Thanks for your help!
Dan
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Old Nov 23, 2011, 08:46 PM
Fly Low Fly Fast Fly Often
jjr2001's Avatar
Glendale, Arizona
Joined Jul 2007
843 Posts
Quote:
Originally Posted by Herb View Post
I just weighed mine, 8.1 lbs rtf with 8S 3000's, 120A hv esc and strobe etc.

I like your setup ! I am a great fan of Bluebird servos, they are top notch!! In my second Hawk I am using the BMS 375MG digitals on the ailerons

http://www.hobbyking.com/hobbyking/s...sec_11_4g.html

and some less expensive HS-82 MG clones on the flaps. HS-55's for the dual elevators.
I have been a fan of BlueBird for a while now and think they are a good value.
I have an Eagle Tree Airspeed microsensor and need to install it so I can see just how fast this bird is.....

Have you been able to get a speed reading on your 8S setup?

Thanks, JR
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Old Nov 23, 2011, 10:34 PM
1.21 Gigawatts!
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Irvine, CA, USA
Joined Oct 2000
7,347 Posts
Herb, bring it to great park sometime. We have a radar gun here.
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Old Nov 24, 2011, 12:44 PM
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Herb's Avatar
Irvine, Calif USA
Joined Feb 1999
12,133 Posts
Quote:
Originally Posted by Kaw1000 View Post
Exactly which retracts on this page are the right ones?...I'm new to retracts,
what else do you need to complete the retracts? Struts?...if so which ones?
Thanks for your help!
Dan
I am using Springair 602 aircraft-grade aluminum air retracts on mine (1-st and 2-nd),

http://www.retracts.com/Retrax_600.htm

The E-flite 15-25 plastic electric retracts should work too, the next one up (all metal) I think is a bit too thick for the wing ?

http://www.e-fliterc.com/Products/De...ProdID=EFLG230

These struts should work too :

http://www.scaleflying.com/T-45-Land...ts_p_1847.html

This one should work too but I have no experience with it; it's made for the CMP T-45 /Hawk though :

http://www.hobbyking.com/hobbyking/s...dProduct=19949

.
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Last edited by Herb; Nov 24, 2011 at 03:18 PM.
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Old Nov 24, 2011, 12:45 PM
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Herb's Avatar
Irvine, Calif USA
Joined Feb 1999
12,133 Posts
Quote:
Originally Posted by jjr2001 View Post
...Have you been able to get a speed reading on your 8S setup?
From the videos it's in the 120mph range. The Hawk fuse is draggy and not really suited for speed.
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Old Nov 24, 2011, 01:21 PM
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Herb's Avatar
Irvine, Calif USA
Joined Feb 1999
12,133 Posts
It helps to realize - preferably before the maiden - that the CG in the CMP/HK Hawk instructions is still completely off

Power seems low too, and pull on the bungee cord seems a bit weak.

http://www.youtube.com/watch?v=fNp5hn_tcO8
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