By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

New Tony Nijhuis BAe Hawk EDF

All Topics | Latest Posts

Search for:  in Thread Title in  
Tony Nijhuis17/02/2015 13:39:33
avatar
609 forum posts
233 photos

Well it seems that RCM&E are not content with just one Special a year, they have now decided to go for another.... two specials (the existing Autumn and the new Spring Special) and that means two plans from yours truly!!!!!

Now fortunately I had the next TND project on the go which was a DF powered Hawk so this is now going to be the Spring Special Plan.

After the roaring success of the DF Vulcan i though may be I have been missing a trick with this ducted fan lark....So the Hawk seemed the next logical step....So 42" span 4.5lb AUW very near scale, flaps and retracts and 70mm 6S fan unit to power it. Test flight is scheduled for next week so lets hope for some dry weather...

Happy days

john stones 117/02/2015 14:05:42
avatar
11178 forum posts
1507 photos

Good luck with the weather and maiden Tonyhot

John

Olly P17/02/2015 14:55:10
avatar
3215 forum posts
181 photos

Sounds good - and a likely conversion candidate for PSS.....

Mowerman17/02/2015 15:30:17
avatar
1548 forum posts
105 photos

Sorry, everyone builds Hawks, should have been a Folland Gnat with Finnish and Indian Variants.

Alan Jarvis17/02/2015 19:13:05
169 forum posts
30 photos

Just built the Vulcan and now looking forward to the Hawk. Tony, any chance of giving some details of the motor/fan etc so I can put them on my shopping list.

Pete B - Moderator17/02/2015 19:15:06
avatar
Moderator
7628 forum posts
733 photos

Off-topic posts removed, folks - this thread is about a DF Hawk. If you wish to discuss other matters please start a thread in the appropriate section, thankssmile

Pete

FastFlyer Smyth17/02/2015 19:18:48
309 forum posts
12 photos

very much looking forward to this one Tony !!

Gavin Livsey17/02/2015 19:40:13
avatar
113 forum posts

I'm in and watching.

ken anderson.17/02/2015 19:46:13
avatar
8556 forum posts
776 photos

well done Pete..tony lets have a photo or 3 please...the hawk will go down well......especially red arrow colours etc..

ken Anderson...ne...1...... hawk dept.

Tim Mackey17/02/2015 21:01:32
avatar
20920 forum posts
304 photos
15 articles
Yummy
Keith Simmons17/02/2015 21:06:35
450 forum posts
9 photos

Yuppie smile p

Tony Nijhuis17/02/2015 21:59:48
avatar
609 forum posts
233 photos

Ok some development photos to whet your appetite

I have used an old Lander 68mm 5-bladed unit with a 2600kvs motor on 6S. This should deliver around 2.1kg of thrust which in theory will give a 1 to 1 thrust to weight ratio...!!!smiley The plan is this model has to RO cut grass which is a big ask as the retract wheels are quite small....still we shall see

I have kept this build very simple and very near scale so hopefully it will attract the the not so practiced builders out there and also the rooky DF modellers wanting to have a go (of which I am one of them)

img_2963.jpg

img_2964.jpg

img_2965.jpg

img_2966.jpg

img_2967.jpg

img_2968.jpg

img_2969.jpg

Steve Adams17/02/2015 22:43:13
196 forum posts

Your becoming a dab hand at this edf malarky Mr N!

When this little beauty is done,will you do anymore edfs sir? If so I would love to see a Harrier, Meteor NF 11,or a ME 262 I really love jets as you can tell, particularly the classic ones are the best thumbs up

Steve smiley

stuey18/02/2015 08:37:19
avatar
602 forum posts
12 photos

Looks like just what I need! And my wife cant complain as she works at Air Command and my 3yr old son loves the Red Arrows. It would most likely be a belly lander for me and maybe a bungee launch depending on the static thrust.

Are you planning to make an intake duct into the fan or leave it as per the pics?

Andy Meade18/02/2015 08:53:15
avatar
2748 forum posts
709 photos
Posted by Olly P on 17/02/2015 14:55:10:

Sounds good - and a likely conversion candidate for PSS.....

That's just what I was going to say wink

Looking good Tony cool

Alan Jarvis18/02/2015 09:35:15
169 forum posts
30 photos

Tony

I am just wondering if it really needs a 6s battery I would have thought with a decent 11 blade fan and 4s would work. There would be a good saving in weight and cost, whilst it may not give 1:1 I am sure it would not be far off. Your Vulcan only uses 3s although not a speed machine.

Can we have a 90mm Eurofighter Typhoon next.

Tony Nijhuis18/02/2015 18:26:18
avatar
609 forum posts
233 photos

Well its now ready for test flying and the AUW is just over 2.1kg. The fan unit I have measured is giving around 1.6kg of thrust which ties up with the Lander test video on their web site. Ran the model around the lumpy back garden and was able to push her round no problem.....with a summer mown strip, she ROG no problem.

Alan, your comment about the 4s version; I have a Dr MT 11 bladed 4S unit from hobby king, bought as an alternative. The thrust is similar to the Lander I'm using but the weight is 60g more. Because the 4S will draw more current to deliver the same power as the 6S, the batteries will need to be of larger capacity...at least 5000mah.....(I used a 3300mah 6S for the Lander fan).......QED to deliver the same performance and duration, the 4S version actually turned out to be a heavier install......the key point to bear in mind here is use as higher voltage as possible as this will deliver the power at less current. 6S is a great size because most modern cheap charges and ESC will cope with 6S. Once you go above 6S, the cost of ancillary equipment increases alarmingly.

Stuey's point concerning intake ducts is an interesting one.......there is a benefit to a smooth intake but not a much as one might think. the most important element is the 'bellmouth' intake to the fan and most manufactures now fit these as they increase the performance and therefore placing less reliance on the modeller making smooth intake ducts or a kit manufacture producing a light composite product which adds weight. If we can avoid the difficulty of intake ducts on plan build models, it really opens up a more simplicity approach to ducted fan modelling with out be penalised on performance. Interestingly I have done some test with the Lander fan both in and out the model and there appeared no loss in performance!!!

Based on this simplistic and if the Hawk design is successful, I will certainly be adding more EDF's to the rangewink ...happy days

Bill_B18/02/2015 18:34:51
avatar
1145 forum posts
11 photos

If going for a bungee launch, surely the retracts and flap servos could be omitted saving a fair amount of weight and thus not only increasing the performance, but giving even better slow speed handling too.

I might just give this one a punt. thumbs up

stuey18/02/2015 20:10:37
avatar
602 forum posts
12 photos

Thanks for the feedback on the ducting Tony. I have seen a few larger edf builds where there is no specific ducting and the fan is fitted with a bell inlet. I have also noted that turbine models have very little ducting and have all sorts of bits in the airflow, but I guess they have thrust to spare.

I would like to see a Eurofighter too, preferably 70mm but scaling up to 90mm would be easy enough. Please!!

Tony Nijhuis18/02/2015 20:42:14
avatar
609 forum posts
233 photos

Correct.....there's no need to duct the inlet on to turbines....they simply deliver enough thrust so inlet duct become superfluous. The great thing with the current batch of EDF units is they are following in the foot steps of turbines....exciting times for EDF

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E! 

Latest Forum Posts
Support Our Partners
Slec
Wings & Wheels 2019
Sussex Model Centre
CADMA
Cambridge Gliding Club
electricwingman 2017
CML
Sarik
Advertise With Us
Latest "For Sale" Ads
Has home isolation prompted you to start trad' building?
Q: The effects of Coronavirus

 Yes - for the first time
 Yes - but Ive bashed balsa before
 No - Ive existing projects on the bench
 No - Im strictly an ARTF person

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us