Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Possibly a terrible idea - Page 2 Babe_b10
Log in

I forgot my password

Possibly a terrible idea - Page 2 Pixel
Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Trout Fishing season!
by dckrsn Yesterday at 10:21 pm

» My layout as it progresses
by NEW222 Yesterday at 8:24 pm

» New Quickie 100 micro pylon racer project
by kazaklisglider Yesterday at 3:40 pm

» Cox train forum?
by fredvon4 Yesterday at 9:25 am

» **VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (December 2019)
by 1/2A Nut Fri Dec 13, 2019 8:54 pm

» Recent engine acquisitions
by aspeed Fri Dec 13, 2019 7:33 pm

» MINWAX Which one to use
by oldguy Fri Dec 13, 2019 3:40 pm

» Wanted! Pilot head for a PT-19
by NEW222 Fri Dec 13, 2019 10:33 am

» BHM Mosquito in MS-build
by rsv1cox Fri Dec 13, 2019 7:03 am

» WARNING - Scam website for Cox products - WARNING
by NEW222 Thu Dec 12, 2019 10:53 pm

Cox Engine of The Month
November-2019
jmcalata's

"Pee Wee .020 throttled combinated"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


Possibly a terrible idea - Page 2 Empty
World of Aviation

Possibly a terrible idea

Page 2 of 2 Previous  1, 2

Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  Oldenginerod on Fri Sep 13, 2019 7:54 pm

Can someone please confirm, was the Curtiss Hawk the forerunner to the P-40? They look very similar apart from the radial engine.
Huh...
Oldenginerod
Oldenginerod
Diamond Member
Diamond Member

Posts : 2773
Join date : 2012-06-15
Age : 57
Location : Victoria, Australia

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  Marleysky on Fri Sep 13, 2019 8:24 pm

Oldenginerod wrote:Can someone please confirm, was the Curtiss Hawk the forerunner to the P-40?  They look very similar apart from the radial engine.
Huh...

Yup!


“DescriptionThe Curtiss P-40 Warhawk is an American single-engined, single-seat, all-metal fighter and ground-attack aircraft that first flew in 1938. The P-40 design was a modification of the previous Curtiss P-36 Hawk which reduced development time and enabled a rapid entry into production and operational service. “.  Wikipedia

Looking up the P36:
With around 1,000 aircraft built by Curtiss itself, the P-36 was a major commercial success for the company. It also became the basis not only of the P-40, but two other, unsuccessful prototypes: the P-37 and the XP-42.
Marleysky
Marleysky
Diamond Member
Diamond Member

2019 Supporter

Posts : 2434
Join date : 2014-09-28
Age : 67
Location : Grand Rapids, MI

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  MauricioB on Fri Sep 13, 2019 9:54 pm

I really like what you have done, the change from electric to glow. His model works wonders.
Could you please comment, what servos do you use and what battery on board?
Thank you very much, I congratulate you!
MauricioB
MauricioB
Diamond Member
Diamond Member

Posts : 2201
Join date : 2016-02-16
Age : 48

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  dirk gently on Sat Sep 14, 2019 2:37 am

Two cheap 5g servos (Tower Pro or some other generic (off-)brand), a 120mAh 2s LiPo battery and I use my "3 diodes in series" voltage regulator to drop the battery voltage by approx. 2V before feeding it into the receiver.
dirk gently
dirk gently
Gold Member
Gold Member

Posts : 321
Join date : 2012-02-03
Age : 37
Location : Poznań

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  dirk gently on Sat Sep 14, 2019 2:47 am

Oldenginerod wrote:Can someone please confirm, was the Curtiss Hawk the forerunner to the P-40?  They look very similar apart from the radial engine.
Huh...

Aircraft companies (in fact, all engineering companies) use their know-how to reduce development time and risk, which results in similarities between aircraft. Look at the Seversky P-35, Republic P-43 Lancer and Republic P-47 Thunderbolt - their wings have the same shape (and, less obviously, airfoil. Note: Seversky and Republic are the same company). Even today, all the Boeing airliners have the same nose shape, and all the Airbus airliners have the same nose shape, that's different from the Boeing one.

This doesn't necessarily mean companies just take an existing airframe and shove, a more powerful engine on it and call it a new type of airplane (well, they sometime also do that as well Very Happy). Look at these three 1930s Polish fighters:
https://en.wikipedia.org/wiki/PZL_P.7
https://en.wikipedia.org/wiki/PZL_P.11
https://en.wikipedia.org/wiki/PZL_P.24
Wikipedia (incorrectly) calls the P.24 a "variant" of the P.11, and if you look at them you may think "oh yeah, they just put a different engine, covered the canopy, added wheel fairings, job done", but in fact, only 30% of the P.11 parts were reused on the P.24. In fact, the latter has an entire new wing designed from scratch, even though it looks identical to the P.11 wing to the naked eye. Further still, virtually no parts of the P.7 were reused on the P.11.

How much of the P-36 was actually reused on the P-40 - I don't know, I wouldn't trust Wikipedia on this unless there's a good source quoted.
dirk gently
dirk gently
Gold Member
Gold Member

Posts : 321
Join date : 2012-02-03
Age : 37
Location : Poznań

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  MauricioB on Sat Sep 14, 2019 10:27 am

dirk gently wrote:Two cheap 5g servos (Tower Pro or some other generic (off-)brand), a 120mAh 2s LiPo battery and I use my "3 diodes in series" voltage regulator to drop the battery voltage by approx. 2V before feeding it into the receiver.

Thanks for answering.
You tell me that you use a BEC then, or that your own voltage regulator is manufactured?
In my case I use a direct battery of 3.7 volts and 250 mha, and I carry 3 Turnigy 1440 micro servos, Ailerons, motor and depth, (no steering wheel), that allows me two flights of about 8 minutes each safely, then of that I have to recharge the battery.
The RX below 3.5 volts are reset, therefore I am interested to know if your regulator is manufactured by you or is a commercial voltage regulator. From already thank you very much.
Due to the speed and effort that the servos do, this model of the small ones that I have is the one that consumes the most battery in flight.
Here is a video of my model of which I speak, greetings:
Possibly a terrible idea - Page 2 20190913


MauricioB
MauricioB
Diamond Member
Diamond Member

Posts : 2201
Join date : 2016-02-16
Age : 48

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  dirk gently on Sun Sep 15, 2019 3:30 am

I literally just use two (or three, depending on the receiver's rated voltage) 1N4007 silicone diodes in series with a JST plug on one side and a servo plug on the other. Each diode provides around 0.7V voltage drop, so for example 3 diodes drop the voltage from 8V to 5.9V.
I described this method on this forum years and years ago, and for the life of me I can't find the topic now.
dirk gently
dirk gently
Gold Member
Gold Member

Posts : 321
Join date : 2012-02-03
Age : 37
Location : Poznań

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  MauricioB on Sun Sep 15, 2019 4:58 am

Thank you very much for that information, that is, you can make your own voltage regulator according to your needs.
I will consider this data. Thank you!!... Thumbs Up
MauricioB
MauricioB
Diamond Member
Diamond Member

Posts : 2201
Join date : 2016-02-16
Age : 48

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  dirk gently on Sun Sep 15, 2019 6:46 am

BTW, I also used a home-made regulator based on the TL7805. That works ok, providing 5V@1A, but the weight is comparable to a cheap 6AMP brushless ESC, a bunch of which I happen to have laying around. I can use the BEC of an ESC like for notro flying. I'm not sure it provides continuous 1A though, but it seems to work alright for small models.
dirk gently
dirk gently
Gold Member
Gold Member

Posts : 321
Join date : 2012-02-03
Age : 37
Location : Poznań

Back to top Go down

Possibly a terrible idea - Page 2 Empty Re: Possibly a terrible idea

Post  Sponsored content


Sponsored content


Back to top Go down

Page 2 of 2 Previous  1, 2

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum