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Mar 12, 2012, 07:27 AM
Registered User
Discussion

Boeing 727


Model boeing 727
length 215 cm aprox. 85 inch
wing span 200 cm --79 inch
weight 4 kg.
fan-motor; 2 HET 70 mm fan and 2200 kv inrunner
6s 5000 mah 40 c lipo.
I built this plane from depron and 3 mm depron like material. Then I coated with epoxy and 50 gr/m2 fiber.
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Mar 12, 2012, 07:40 AM
Registered User
continue,
I have used electronic servoless retrack.
Now plane weight is 2500 gr without lipo. Last weight isnot more than I expected.
Mar 12, 2012, 08:08 AM
Use your imagination....
czirh's Avatar
Nice project,
kolay gelsin.

Cem
Mar 12, 2012, 10:01 AM
Registered User
Teşekkürler.
This is a quick built. I want to fly it as soon as possible.
Mar 12, 2012, 06:37 PM
Avoid The Ground!
Flexserve's Avatar
I must say. I like how fast you build! Looks like a card model based build. Good Luck Have Fun with it! Subbed!
Mar 12, 2012, 08:38 PM
Right Rudder
PittSpecial's Avatar
Wow! This thread took my breath away as my father used to fly this Jet during late 70's, 80's and early 90's. He flew for AVIANCA (Colombian Airlines) and did so on 727.

True work horse of the Airline industry back then!



Can't wait to see additional progress!
Mar 12, 2012, 08:43 PM
Right Rudder
PittSpecial's Avatar
Just one question,

4,000grams ~ 8.9lbs.

Do you feel that the 70mm will be enough thrust?

I see you like to keep it scale but, I was wondering if 90mm EDF's would not be more in mind for good thrust?

I am no EDF expert, just wondering out loud.

Thanks!
Carlos
Mar 13, 2012, 02:11 AM
Registered User
carrerars's Avatar
Well in my opinion the 70mm fans should be ok.
There are different planes of that size and weight using 70mm fans even with a 4s setup and it works well. (e.g. Windrider 737-700)
Have a similar issue right now. I'm building an A319 with 2m wingspan.
Even if 90mm fans would look better and fit in the nancelles I'll try 70mms because of weight and amps.

Markus
Mar 13, 2012, 03:22 AM
Registered User
Thank you.
I think two HET fans would be sufficient. Total power aproximately 1600 watt. These fans are very well balanced. I measured total thrust 2800-3000kg.
In fact, estimated ( most pessimistic) maximum weight is 4 kg.

This plane is our previous airliner. She is 3.5 kg. She flew with only 1000 watts.
Video
RC A320 EDF Home-made (2 min 56 sec)
Mar 22, 2012, 04:29 PM
Go FASST or go home...
Ben_E's Avatar
Quote:
Originally Posted by PittSpecial View Post
Just one question,

4,000grams ~ 8.9lbs.

Do you feel that the 70mm will be enough thrust?

I see you like to keep it scale but, I was wondering if 90mm EDF's would not be more in mind for good thrust?

I am no EDF expert, just wondering out loud.

Thanks!
Carlos
My windrider 737, is 4,3kg - somewhat on the heavy side... The Changesun 70mm fans delivers about 1,2 kg thrust at approx 600W per motor and it flies fine, no problem

Boeing 737 from Windrider.wmv (4 min 27 sec)


Ben_E
Mar 22, 2012, 05:16 PM
Right Rudder
PittSpecial's Avatar
Understood, Got It, by George....etc...

No need for more examples.

Thanks!
Apr 26, 2012, 11:38 AM
was geht , müssen unten kommen
Keenan smith's Avatar
Wow! Subbed up
Welcome to the club
BTW could you guys Chime in on This Rcgroups airliner forum Request thread
https://www.rcgroups.com/forums/show...1604714&page=4
Apr 26, 2012, 03:56 PM
Scale Modeler
Concordefan's Avatar
Very nice and fast build here. It looks more like in between Yak 40, Bac 111 and HS Trident to me then a B727!, either way beautiful model it's going to be once done.
Apr 26, 2012, 06:06 PM
Give me a TriStar anyday!
NAKIAM949's Avatar
Subbed can't wait to see the finished product.
May 02, 2012, 07:56 AM
Registered User
Quote:
Originally Posted by Concordefan View Post
Very nice and fast build here. It looks more like in between Yak 40, Bac 111 and HS Trident to me then a B727!, either way beautiful model it's going to be once done.
Thank you, I can not see details of the plane as good as you. I dont have much information about airliner. This is my second airliner but I have alot of EDF plane.

She flew in this weekend. The plane took off and landed very well. I will upload the maiden flight video.
Last edited by candane; May 02, 2012 at 08:07 AM.


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