New Tank Configuration for Wren 44 - HeliFreak
Fun, Learning, Friendship and Mutual Respect START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Turbine Helicopters


Turbine Helicopters Turbine R/C Helicopters


Reply
 
LinkBack Thread Tools Display Modes
Old 11-08-2011, 03:00 PM   #1 (permalink)
Registered Users
 
Posts: 1,349
 

Join Date: Aug 2007
Location: Canada
Default New Tank Configuration for Wren 44

Well, as mentioned in another thread. Here are the pictures of the new tank configuration I have for my Trex744.

As some of you may remember, I originally had those twin (ugly) green tanks on the sides. I decided to streamline it and place a smaller 24 oz. Du-Bro tank below the tail.

The twin tanks were 30 oz with the BVM, this one is 24oz. I was getting 15minutes with the twin tanks... took here for a spin today and I'm getting 8 minutes leaving about 1 oz of fuel in my BVM. It's a little less than I expected. But not bad.

The CG is actually more to the front (even with a full tank) now which I think is strange... but it's not bad. I may be able to even it out more.

Thinking of placing a couple of small overflow tanks on the side to add more time. But not sure how to Plumb it as this stage.

If people can respond with their current fuel capacity and flight time using a wren 44 I'd appreciate it.

Forgot to mention. I have it titled slightly back so that all the fuel drains. Once I get my CNC mill up and running I plan on making a better set of mounts out of CF.

Thanks.
Attached Thumbnails
Click image for larger version

Name:	photo.JPG
Views:	191
Size:	139.5 KB
ID:	265511   Click image for larger version

Name:	photo2.JPG
Views:	165
Size:	110.4 KB
ID:	265512  
__________________
Cheers, Deron.
Still lovin' it after all these years

DDragon is offline        Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-09-2011, 11:19 AM   #2 (permalink)
Registered Users
 
Posts: 5,386
 

Join Date: May 2006
Location: Bay Area, California, U.S.
Default

Oh my, not sure. Looks a little cobbled on, IMHO. Please accept this with the helpful spirit that it is intended.
__________________
Have laser, will travel.
cbdane is offline        Reply With Quote Quick reply to this message
Old 11-09-2011, 02:56 PM   #3 (permalink)
Registered Users
 
Posts: 186
 

Join Date: Feb 2006
Location: Cairns, Australia
Default

Is that a good idea to lay the gas cylinder on it's side? I would think liquid gas would be more likely to flow out of the cylinder like that.
__________________
MA RAZOR#26-Hyperion brushless,110HV,9S,9252, HK Fubar...thrashing machine
Trex844 Turbine (stretched 700), Wren 44 heli, Hitec HV servos, FBL CGY750 1.4, born 01/2010
MAAA: RW25, FW25, Gas Turbine Inspector
Aussieheliguy is offline        Reply With Quote Quick reply to this message
Old 11-09-2011, 02:59 PM   #4 (permalink)
Registered Users
 
Posts: 1,354
 
My HF Map location
Join Date: Mar 2005
Location: Detroit Lakes, MN
Default

Gotta agree with cbdane to tell the truth. That is where the tank sits on my Pred/Wren and I hate how mine looks. I'd rather have the saddle tanks on mine... Sorry dude... We could all have a if that helps...

Paul
__________________
I love the smell of kero in the morning....
ppridday is offline        Reply With Quote Quick reply to this message
Old 11-09-2011, 07:32 PM   #5 (permalink)
Registered Users
 
Posts: 1,349
Thread Starter Thread Starter
 

Join Date: Aug 2007
Location: Canada
Default

Thanks Paul thanks cbdane

Actually I adjusted it today so it sits higher. Right now this whole exercise is just for proof of concept. If the positioning works out I'll make some better brackets out of cf once I get my cnc mill up and running.

So far it's not bad, but I'm unsure about the center of gravity and I'm only getting 6-8 minutes flight time. I was getting 15 out of the twin tanks.

If this doesn't work out maybe I'll go back to the side tanks. Actually, I saved a set of Budweiser can/bottles I thought those would skew cool fuel tanks.

But this is just another winter project

Hey Paul, forgot to mention, it handles like the wren pred with this configuration... Not sure if I like that. I can see myself going back to the side tanks once I get my machine working... One thing for sure, the side tanks with the PVC brackets may have looked like hell, but it was really well balanced.

Thanks guys, I do appreciate your comments thats why we pst here right?
__________________
Cheers, Deron.
Still lovin' it after all these years

DDragon is offline        Reply With Quote Quick reply to this message
Old 11-09-2011, 07:36 PM   #6 (permalink)
Registered Users
 
Posts: 1,349
Thread Starter Thread Starter
 

Join Date: Aug 2007
Location: Canada
Default

Quote:
Originally Posted by Aussieheliguy View Post
Is that a good idea to lay the gas cylinder on it's side? I would think liquid gas would be more likely to flow out of the cylinder like that.
Forgot to mention.... I have it like this on my wrenpred too... Never had a problem.... But I don't fill it up much...just a squirt to get it started. I think if I filled I up more it would cause more problems.
__________________
Cheers, Deron.
Still lovin' it after all these years

DDragon is offline        Reply With Quote Quick reply to this message
Old 11-09-2011, 08:02 PM   #7 (permalink)
Registered Users
 
Posts: 1,349
Thread Starter Thread Starter
 

Join Date: Aug 2007
Location: Canada
Default New Pic

Just for fun... here's a pic of the tank a little higher... I lifted it about 1 inch. It's very stable and sits well between the rails. But the CG is off and the time still bugs me.
Attached Thumbnails
Click image for larger version

Name:	new.jpg
Views:	101
Size:	119.8 KB
ID:	265816  
__________________
Cheers, Deron.
Still lovin' it after all these years

DDragon is offline        Reply With Quote Quick reply to this message
Old 11-10-2011, 01:09 PM   #8 (permalink)
Registered Users
 
Posts: 2,226
 
My HF Map location
Join Date: Aug 2006
Location: Westfield, IN
Default

With the Bergen setup of side tanks at .6 liters a piece I fly for 9:30 with a 2:00 reserve.

Tanks sit centered over the main shaft so there isn't a change of CG as it flies.

Lou
__________________
Vector 550 Quad/Octo Multirotors
DJI WooKong Multirotor Controllers
Twin Bergen 44 Magnum Turbines - KERO Start FBL
www.circlecityhelis.com
lperagallo is offline        Reply With Quote Quick reply to this message
Old 11-10-2011, 04:46 PM   #9 (permalink)
Registered Users
 
Posts: 204
 

Join Date: Jul 2011
Location: Kent, UK
Default

Yeah deffinatly would not put gas cannister on its side, it needs to be upright or neat liquid will enter which will expand in the turbine and cook it to near melting point.
On my Longranger where by design the cannister is on its side under the rear seat i allowed this to happen and On a data download i did, my MW54 i had reached 1100oC, thinking the ECU would shut it down i carried on with the startup process.
It was only after a chat to Wren that i found out, that on the startup some of the fadecs dont shut down a high temp,and some do, but they did not know which ones did and which ones didn't, I have a Mark 4, 54.

I stripped the turbine down, and could clearly see where it had really over heated, so after this as turbine was down on power, I ensure that my cannister is vertical on all my turbine machines.

Matt
__________________
Have Fun
MattJenner is offline        Reply With Quote Quick reply to this message
Old 11-10-2011, 10:41 PM   #10 (permalink)
Registered Users
 
Posts: 1,349
Thread Starter Thread Starter
 

Join Date: Aug 2007
Location: Canada
Default

Hmmm, been thinking. I may pull everything apart and go with the stock tank and position. CG can really make or break the fun factor. And it's not too fun.
__________________
Cheers, Deron.
Still lovin' it after all these years

DDragon is offline        Reply With Quote Quick reply to this message
Old 11-11-2011, 01:14 PM   #11 (permalink)
Registered Users
 
Posts: 1,349
Thread Starter Thread Starter
 

Join Date: Aug 2007
Location: Canada
Default

Do most people get two stock tanks, cut them in half and plastic weld them together to make them larger? I may give the a try.
__________________
Cheers, Deron.
Still lovin' it after all these years

DDragon is offline        Reply With Quote Quick reply to this message
Old 11-11-2011, 10:31 PM   #12 (permalink)
Registered Users
 

Join Date: Sep 2006
Location: Nelson / New Zealand
Default

How long is the flight time with those using the HeliChris conversion with that big round tank. You might be able to get the big round tank and cut to fit into the standard 700. Looks tidy, Just a thought.
rcnz is online now        Reply With Quote Quick reply to this message
Old 11-12-2011, 12:57 PM   #13 (permalink)
Registered Users
 
Posts: 6,266
 
My HF Map location
Join Date: Apr 2004
Location: Oegstgeest, the Netherlands
Default

I really felt a difference in the whole flight, because of CG issues on my Predator Jetcat with the tanks in the back.
__________________
Logo 800/Jeti DS16
Laurens is offline        Reply With Quote Quick reply to this message
Old 11-13-2011, 03:23 AM   #14 (permalink)
Registered Users
 
Posts: 757
 

Join Date: Nov 2008
Location: London
Default

Quote:
Originally Posted by DDragon View Post
Do most people get two stock tanks, cut them in half and plastic weld them together to make them larger? I may give the a try.
Tried that and it worked, apart from if you left it standing with any fuel left in the tank. It would slowly leach out through the joint if it wasn't perfect. Eventually settled on 2 700 tanks side by side in the normal 700 position and hooked up in parallel.
__________________
Trex 600N Pro with Vibe 50 Head and YS91RS motor, Vibe 50 VBar FBL, Trex744 VBar FBL MW44 Turbine, Logo 800 XXTreme, Logo 600 12s, Logo 500SE, Vario UH-1D (Building), Scratch built 625mm Quad.
kevinww is online now        Reply With Quote Quick reply to this message
Old 11-13-2011, 10:10 PM   #15 (permalink)
Registered Users
 
Posts: 1,349
Thread Starter Thread Starter
 

Join Date: Aug 2007
Location: Canada
Default

Quote:
Originally Posted by kevinww View Post
Tried that and it worked, apart from if you left it standing with any fuel left in the tank. It would slowly leach out through the joint if it wasn't perfect. Eventually settled on 2 700 tanks side by side in the normal 700 position and hooked up in parallel.
I thought of the as well, reminded me of my Harley tanks. How did you get around the problem of the right side of the tank not being square? Do you have any pics?

Thanks
__________________
Cheers, Deron.
Still lovin' it after all these years

DDragon is offline        Reply With Quote Quick reply to this message
Old 11-15-2011, 05:31 PM   #16 (permalink)
Registered Users
 
Posts: 757
 

Join Date: Nov 2008
Location: London
Default

Its not really a problem, you just angle both tanks towards the back slightly.
__________________
Trex 600N Pro with Vibe 50 Head and YS91RS motor, Vibe 50 VBar FBL, Trex744 VBar FBL MW44 Turbine, Logo 800 XXTreme, Logo 600 12s, Logo 500SE, Vario UH-1D (Building), Scratch built 625mm Quad.
kevinww is online now        Reply With Quote Quick reply to this message
Old 11-15-2011, 06:40 PM   #17 (permalink)
Registered Users
 
Posts: 1,349
Thread Starter Thread Starter
 

Join Date: Aug 2007
Location: Canada
Default

Quote:
Originally Posted by kevinww View Post
Its not really a problem, you just angle both tanks towards the back slightly.
LOL... didn't think of that?!

Thanks
__________________
Cheers, Deron.
Still lovin' it after all these years

DDragon is offline        Reply With Quote Quick reply to this message
Reply




Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the HeliFreak forums, you must first register.
Please enter your desired user name, your REAL and WORKING email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself. Use a real email address or you will not be granted access to the site. Thank you.
Email Address:
Location
Where do you live? ie: Country, State, City or General Geographic Location please.
Name and Lastname
Enter name and last name here. (This information is not shown to the general public. Optional)
Helicopter #1
Enter Helicopter #1 type and equipment.
Insurance
Please select your insurance company (Optional)
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




Copyright © VerticalScope Inc. All rights reserved.
 

SEO by vBSEO 3.6.1