HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jul 24, 2002, 02:38 PM
EDF all the way!
bruff's Avatar
Gilbert, Az
Joined Jun 1999
7,939 Posts
Mini-Bobcat flew today

Flew my new Mini-BobCat today. All I can say is Wow! It uses the WeMoTec Mini fan with a Astro 805 power system on 10 cells (Sanyo 4/5 AUP 1700 ma cells. This plane is quick.With the above batteries I'm using 250 Watts which produces 31,000 RPM. Flying weight is 39 oz. I'll be doing more test flights next Sat. Keep you posted.
Thanks, dcronkhite for the plans!


Here is another picture.
.
bruff is offline Find More Posts by bruff
Last edited by bruff; Jul 24, 2002 at 02:42 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Jul 24, 2002, 03:19 PM
Col.Hooligan Air Force
uncljoe's Avatar
Phoenix,Arizona
Joined Jul 2001
1,205 Posts
Bob
Congrats,
Looks real sharpe ,could it employ retracs?

Semper Fi
Joe
uncljoe is offline Find More Posts by uncljoe
Reply With Quote
Old Jul 24, 2002, 03:26 PM
Flying Welder Pilot
Plane Crazy's Avatar
Reno, Nevada
Joined Jan 2001
1,137 Posts
Bobcat,Bobcat, Bobcat, Bobcat........

Very COOL Bob , Fixed gear and all. ROG?
What did you use for control throws? I guess I'll have to dust off dcronkhite's plans and knock one out. I have a spare 805 and a minifan kicking around the shop looking for a home.

I imagine Bob Violett will be seeing some of these mini Bobcat EDFs flying around some jet meets.

Keep us informed on the flight tests

Gordon
Plane Crazy is offline Find More Posts by Plane Crazy
Last edited by Plane Crazy; Jul 24, 2002 at 03:29 PM.
Reply With Quote
Old Jul 24, 2002, 04:35 PM
FoamyFactory.com
Tim H.'s Avatar
USA, TX, Fort Worth
Joined Nov 2001
4,344 Posts
Great job Bob! I've been wanting to do the Mini Bobcat for a while, but I have so many other projects going that I just can't get one more going right now. It is definately on the to-do list though.

How did the Sanyo 4/5 AUP 1700 ma cells do? What was your run time. Same power as the CP1700s? I've been watching to see how these new cells are doing. 10 of these puppies are almost 6oz. lighter than 10 CP1700s. Might help the power to weight ratio a bit I'd say.

I was thinking of using 12 of those cells and a Mega 16/15/3 in a MF480. Chris True tested the little mega 16/15/3 on 12 CP-1300's. It was just over 34K @ about 350 watts with the current draw 23-24 amps. That would put it at 145 watts per pound at 39 oz. Woooo Whoooo. Here is the thread with the info.
http://www.rcgroups.com/forums/showt...ga+16%2F15%2F3

Tim H.
Tim H. is offline Find More Posts by Tim H.
Reply With Quote
Old Jul 24, 2002, 06:04 PM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
13,560 Posts
Way to go!!!

Hi Bob,

The plane looks great. How did you do the wing, built up balsa are did you cut foam. I was ondering how you did the sub fuses concerning the wing. Doug was turning over the idea of plug in outer panels.

Eric
AirX is offline Find More Posts by AirX
Reply With Quote
Old Jul 24, 2002, 06:20 PM
EDF all the way!
bruff's Avatar
Gilbert, Az
Joined Jun 1999
7,939 Posts
BobCat

Thanks Guys, the plane is fixed gear. Take offs are ROG. The wing is foam, two halves glued together. Has four servo's, two for the ailerons, one for the elevator and one for the nose steering. I think the Mico EJF retracts may fit. The cells seem to be doing fine, I need to compare numbers to a Nicad pack to see how they are. Next week I will finish covering it. Did enough so I could get the flight in.
bruff is offline Find More Posts by bruff
Reply With Quote
Old Jul 24, 2002, 06:30 PM
Registered User
Ed Waldrep's Avatar
Las Vegas, NV
Joined Dec 1996
7,929 Posts
Steve Neu's "Power On" column in the new (Sept issue) S&E Modeler has a discharge graph of the 4/5 AUP 1700 cells at 10 and 20 amps and they seem to hold voltage pretty well, over 1 volt for 3/4 of the run, right before the steep drop in voltage near the end. No tests at 30 amps but Steve said that he thought that they'd hold up well, and they like to be run hot off the charger, voltage drops if they are allowed to cool after charging. They sound promising.
Ed Waldrep is offline Find More Posts by Ed Waldrep
Reply With Quote
Old Jul 24, 2002, 10:18 PM
Ductedfann's Avatar
mid west
Joined Jan 2002
668 Posts
mini bob

That looks cool
Ductedfann is offline Find More Posts by Ductedfann
Reply With Quote
Old Jul 25, 2002, 03:50 PM
Registered User
kevin's Avatar
ohio
Joined Aug 1999
3,599 Posts
just sent an email to doug, hope he's listening

looks like i might have found a new home for my hacker b40-12s.
retracts would be a must.

bruff,
did you cut your own cores?
kevin is offline Find More Posts by kevin
RCG Plus Member
Latest blog entry: Video of my HK Cobra
Reply With Quote
Old Jul 25, 2002, 05:27 PM
Team JR
Doug Cronkhite's Avatar
San Diego
Joined Feb 2002
1,548 Posts
I'm still here.. Just have been focused on other priorities lately in the 'real world'. Hope to get back to work on the updated Mini-Bobcat in the future.. but I wouldn't count on it for at least 3 months.

My goal is to update it for the EJF retracts, and a built-up, plug-in wing to make transport easier. Again.. no time frame though..

-Doug
Doug Cronkhite is offline Find More Posts by Doug Cronkhite
Reply With Quote
Old Jul 25, 2002, 06:00 PM
EDF all the way!
bruff's Avatar
Gilbert, Az
Joined Jun 1999
7,939 Posts
Foam wings

I used CNC Foam Factory for the cores. He has an ad here on Ezone.
Bob Ruff
bruff is offline Find More Posts by bruff
Reply With Quote
Old Jul 25, 2002, 10:24 PM
Team JR
Doug Cronkhite's Avatar
San Diego
Joined Feb 2002
1,548 Posts
Just as an FYI.. this design may become a kit soon. I can't say where or when yet until I get some details worked out.. but it's VERY possible..

-Doug
Doug Cronkhite is offline Find More Posts by Doug Cronkhite
Reply With Quote
Old Jul 26, 2002, 09:31 AM
Registered User
byoung's Avatar
O'Fallon, MO USA
Joined Dec 1999
1,415 Posts
Doug,

A possible kit is really good news.

Please keep us posted.

Brad
byoung is offline Find More Posts by byoung
Reply With Quote
Old Jul 26, 2002, 09:53 AM
Real Men Fly Pink Planes...
kepople's Avatar
United States, TX, Rockwall
Joined Jun 2001
8,080 Posts
I'll take one!!!!

WhooHooo! What a good job. Glad to hear it flew well!

I dont have time to build anymore, but for that thing I will make time!

Kirby
kepople is offline Find More Posts by kepople
Reply With Quote
Old Jul 26, 2002, 12:08 PM
EDF Jet Jam May 2014
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
6,396 Posts
90 mm Fans

Quote:
Originally posted by dcronkhite
Just as an FYI.. this design may become a kit soon. I can't say where or when yet until I get some details worked out.. but it's VERY possible..

-Doug
Hi Doug,
I would imagine a kit for the 90mm fans would be a really hot set up.
I would buy one in a heartbeat
Thanks Bob
Robert Belluomini is offline Find More Posts by Robert Belluomini
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Mini-Bobcat Doug Cronkhite Electric Ducted Fan Jet Talk 67 Jun 03, 2010 05:57 PM
Mini Max Flies Today Old Bob Parkflyers 2 May 04, 2002 04:49 PM
Scratch built pylon 400 flew today!!! saint152 High Performance 7 Apr 11, 2002 02:29 PM
Mini Fun-Fly today RMihara Electric Heli Talk 0 Apr 01, 2002 01:59 AM
Endoplasma flew today. AMTJIM Sport Planes 2 Sep 24, 2001 12:58 AM