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

Rc delta undercarriage

Not sure how to go about this

All Topics | Latest Posts

Search for:  in Thread Title in  
cymaz09/01/2018 17:56:19
avatar
7232 forum posts
962 photos

embarrassed

I have been given a home made delta ( from the same club member that gave me his 4 engined own design).

I am toying with the idea of putting an undercarriage on it so I can fly it off tarmac. I don’t know how to do this, having never owned or built a delta. I am picking it up on Thursday so it will be a day or two before I can get some photos posted and general dimensions..I would love to see how other deltas owned here have had their wheels stuck on to give me some ideas/inspiration.

I eagerly await your photos.....thanks!

Denis Watkins09/01/2018 18:06:40
2244 forum posts
115 photos

I have got one of these Cymaz, with steerable nosewheel,

And main wheels just a mm or 2 behind the C of G

han3825-action7.jpg

Edited By Denis Watkins on 09/01/2018 18:08:28

cymaz09/01/2018 18:22:34
avatar
7232 forum posts
962 photos

Cheers Denis. Was the UC with the plane or retro fitted?

Dave Bran09/01/2018 18:30:30
avatar
1837 forum posts
5 photos

Does it have a rudder or rudders?

cymaz09/01/2018 18:40:06
avatar
7232 forum posts
962 photos
Posted by Dave Bran on 09/01/2018 18:30:30:

Does it have a rudder or rudders?

IIRC , no. I might need to put a nose wheel servo in.

Denis Watkins09/01/2018 19:14:01
2244 forum posts
115 photos

Those are the original mains, but I have now redesigned these to regular triangle, with extra supports inside the fus.

I will get pictures when I can.

KiwiKid10/01/2018 01:22:16
avatar
320 forum posts
257 photos

As Dennis has mentioned, the ideal location is just behind the CG. Depending on the size of your model this may work out to be10-20mm. In this pic of the Horizon DeltaRay (CG on the finger holes) you can see they have located them about 20mm behind the CG.

deltaray.jpg

This location stops the model sitting on it's tail and aids with takeoff rotation. It is also useful to set the undercarriage up so that the model sits with a slight nose up attitude, again to help with takeoff rotation.

cymaz12/01/2018 17:35:19
avatar
7232 forum posts
962 photos

A few photos and some dimensions ( inches )to get us going...

Span, 44 1/2

Fuselage length, 24 width 2 21/2

Tip width , 6 1/4

Rudder height, 9

Rudder width, 10 with 7 1/2” forward extension

OS 40 fp

Weight 3lbs 5oz

e432c1d1-6b0d-4cf0-870e-b6b654d07517.jpeg

c831f73a-6764-4e74-88ad-ac1b6e9edcdb.jpeg

0e7a98fe-60d1-4975-a2b1-c2df6581ed74.jpeg

cymaz13/01/2018 16:38:31
avatar
7232 forum posts
962 photos

 

 

Did some work on it today. Old 40fp removed as I found a 46ax in the back of the cupboard! Replaced the battery and switch as there was green corrosion on the wiring, ( more cupboard finds). Just ordered a FrSky Fasst Rx..

The CG was measured at 275mm from the LE by the fuselage.

Also found some undercarriage legs from an old trainer. However, there is no room at the front for a nose wheel bracket, so I’ve bought a tail wheel bracket.

Has anyone got any thoughts about fixing a tailwheel to a delta? I suppose it shouldn’t matter. The main gear will go just in front of the CG. 

Edited By cymaz on 13/01/2018 16:43:07

Also replaced the fuel lines and pipe work...

Edited By cymaz on 13/01/2018 16:46:55

Denis Watkins13/01/2018 17:05:20
2244 forum posts
115 photos

Try Cymaz, if you can, to keep the trike with the nosewheel on the front bulkhead

It is nice, with a delta, to have the wing up in the airstream on the wheels for take off

With the taildragger, you don't have the long moment arm to lift the model

fly boy313/01/2018 18:22:22
avatar
3104 forum posts
11 photos

Many many years ago before electrics came n the scene there was an ic traditional shaped delta whos name was followed by the the numbers 341. Golden oldies may remember the details (I cannot) .this had a tricycle u/c which worked very well. Sorry not a lot of help. Cheers

Flyer13/01/2018 20:12:07
avatar
368 forum posts
43 photos
Posted by fly boy3 on 13/01/2018 18:22:22:

Many many years ago before electrics came n the scene there was an ic traditional shaped delta whos name was followed by the the numbers 341. Golden oldies may remember the details (I cannot) .this had a tricycle u/c which worked very well. Sorry not a lot of help. Cheers

Think you may mean this one flyboy3

https://www.sarikhobbies.com/product/rm29-363-delta/

Ade

cymaz13/01/2018 20:38:32
avatar
7232 forum posts
962 photos

I will post photos soon to show the problem I haveangry

cymaz13/01/2018 21:28:04
avatar
7232 forum posts
962 photos

Hope the pictures show the problem..the tank sits right up to the rear of the engine. There is no firewall beneath the engine bay and tank bay to bolt the nose wheel bracket into....

engine bay1.jpg

engine bay2.jpg

engine bay3.jpg

engine bay4.jpg

Flyer13/01/2018 21:37:15
avatar
368 forum posts
43 photos

I'd be tempted to leave it as it is Cymaz and land it on any grass adjacent your tarmac.

But, if you persist, could you fashion a front leg off the engine mounts? Is it a built up wing ? For the mains you could use the sort of set up used in Trainers? Bring the legs into the main 'box structure' and use clamps inside to retain them.

cymaz13/01/2018 21:47:26
avatar
7232 forum posts
962 photos

I have a couple of old legs off a trainer. I will make up a mock when the tail wheel arrives. if it doesn't look good then I will abandon the idea...thanks for the feedback.yes

Flyer13/01/2018 21:55:40
avatar
368 forum posts
43 photos
Posted by cymaz on 13/01/2018 21:47:26:

I have a couple of old legs off a trainer. I will make up a mock when the tail wheel arrives. if it doesn't look good then I will abandon the idea...thanks for the feedback.yes

I'd go with the front leg off the engine mount Cymaz, as if you fit a tail wheel, the delta may well catch the prop once the tail lifts; by using a longer leg than the radius of the prop, you will at least get yourself off the ground. With the sort of power you using, you could always hand launch and just use a taildragger configgeration for landing.

Ade

cymaz14/01/2018 10:35:02
avatar
7232 forum posts
962 photos
Posted by Flyer on 13/01/2018 21:55:40:
Posted by cymaz on 13/01/2018 21:47:26:

I have a couple of old legs off a trainer. I will make up a mock when the tail wheel arrives. if it doesn't look good then I will abandon the idea...thanks for the feedback.yes

I'd go with the front leg off the engine mount Cymaz, as if you fit a tail wheel, the delta may well catch the prop once the tail lifts; by using a longer leg than the radius of the prop, you will at least get yourself off the ground. With the sort of power you using, you could always hand launch and just use a taildragger configgeration for landing.

Ade

I’ve taken your advice and cobbled something together this morning before flying. It should work and not get in the way of anything..a bit of lateral thinking and raiding the parts bin has come up with a workable solution....pics to follow when I get home . Thanks .

Bob Cotsford14/01/2018 12:46:51
avatar
6928 forum posts
393 photos

How about adding a former to carry the noseleg between the tank and the rear of the engine? Or mount the noseleg off set to avoid the fuel lines.

cymaz14/01/2018 16:31:47
avatar
7232 forum posts
962 photos

For all who have seen the thread, I have an update !!!

Finished cobbling from this morning after freezing all my extremities out at Davidstow Club.

I have just a fraction over 1" of prop clearance with an 11x6 APC...

prop gap.jpg

I found a pair of plastic bracket of something. One I butchered to make fit and drilled the hole out for the nose leg.

bracket.jpg

engine bay2.jpg

The steering arm does not foul up the carb/pipework or firewall

tank bay.jpg

front.jpg

 

The push rod goes through the tank bay to the rudder servo

tank bay.jpg

The switch used to be in the front section but now the push rod goes right across the cut out. No big deal there is loads of room in the rear section. The switch will sit in there, behind the rudder servo.

Do you think that will do the trick question

Before I forget...Have I got the main undercarriage in the right place embarrassed

bottom 1.jpg

bottom 2.jpg

Edited By cymaz on 14/01/2018 16:33:13

Edited By cymaz on 14/01/2018 16:36:45

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! 

Email News - Join our newsletter

Love Model Aircraft? Sign up to our emails for the latest news and special offers!

Latest Forum Posts
Support Our Partners
Wings & Wheels 2018
Slec
Expo Tools 14 July
CML
Airtek Hobbies
Overlander
Gliders Distribution
electricwingman 2017
Sarik
Advertise With Us
Latest "For Sale" Ads
How has your building graduated?
Q: Did you start with ARTF and move to building from kits or vice versa?

 Started with ARTF moved to building from kits only
 Started with ARTF moved to building from plans only
 Started with ARTF moved to building from kits and building from plans
 Started with building kits or from plans and moved to ARTF
 I only build from kits or plans
 I only build ARTF
 I only build from kits
 I only build from plans
 Other (Please specify in thread)

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us