sd greenley

[richard armstrong]

hi all

just want to ask

i have a 55cc petrol sitting around

simular to this

http://www.hobbyking.com/hobbyking/stor ... 00RPM.html

would this be powerful enought to put on teh sd greenley not towing with it just using as a trainer?

atb

ric

[arthur barlow]

hi ric a greenley for training on you want a 26 to a z 38 is the best for it?

[sean smith]

Hi Richard,
I had a Zenoah 38 on mine to start out with and the model flies very well with this engine. I have recently put a Zenoah 45 on the model and you really notice the difference in speed with the Zenoah 45.
I assume that this is not your first model? The air frame can take the engine if you feel you can handle the model.

Sean.

[richard armstrong]

I assume that this is not your first model? The air frame can take the engine if you feel you can handle the model.

Sean.

not my first model, but first largish model, i have a wot 4xl tha not flown tan out of cash to, that has a 26cc in it

i had the 50cc for a 1/4 scale chippie but scrapped the build, want to put into the greenley,

have plans to buy the BH 1.4 scale chipmunk,at a later dat, want an airframe tha i don't mind killing, or bashing about, also i want to use to prototype some electronic safety systems, that i want to try out

http://www.hobbyking.com/hobbyking/stor ... _Home.html

i can always limit the throttle to 50% to start with,

1 thing i do want to try is, to get my head around redundancy set up for large scale

i want to make the wings using ali wing joiners ( limited car room),or get foam ones made ?

[John Greenfield]

Guys

Please be sure you are giving the correct advice.

This post started with a request about the SD Greenley, not the Standard Greenley to which I think you are refering. The SD Greenley was designed around a Zenoah 62 and as a tow plane but does make a good sport model with a 50cc motor but as the Zenoah is a very heavy lump when compared to the modern 50cc motors you will have to be careful to built the tail surfaces with very light wood or you will need lead in the front.
The flaps on the SD Greenley wing give an added dimension to its flying but it is equally happy without them if you do not want the complication of building them in.

Full details and free downloads of all the Greenley and Ampley models can be found on the Ghost Squadron website at www.ghostsquadron.co.uk.

John
Greenley designer.

[sean smith]

Richard
The question is which Greenley is it? Standard, SD (i assume its not the SDD). As John has said keep the tail as light as you can i had to add weight to the nose balance my standard Greenley.

(sorry John forgot there was three versions of the model)

Sean.

[richard armstrong]

Richard
The question is which Greenley is it? Standard, SD (i assume its not the SDD). As John has said keep the tail as light as you can i had to add weight to the nose balance my standard Greenley.

(sorry John forgot there was three versions of the model)

Sean.

i did not realise that there where 3 sizes, i was looking at the sd size to use my 50cc engine in wing span of 70"+ or more , i want to make the greenly an easy flyer, and a large-ish model
my plan was to lighten the model where possible, and change the under cart to a fibre glass or ail formed frame, with fat wheels,

that the basis of this model, then use testing platform

[richard armstrong]

The flaps on the SD Greenley wing give an added dimension to its flying but it is equally happy without them if you do not want the complication of building them in.

Full details and free downloads of all the Greenley and Ampley models can be found on the Ghost Squadron website at http://www.ghostsquadron.co.uk.

John
Greenley designer.

john, thank u,

i was thinking of doing flaps, but i was not sure that this was needed, i do want slow flying capabilities,, but also i want to be able to pull basic stunts,

the prinary purpose is to use it as a trainer/test bed

[sean smith]

Richard,
There is a plan for a built up wing for the Greenley which shows the flaps or you can go with foam wings, i got mine cut by Bill at http://www.billkits.com He cut the wings for my Greenley and Lowley.


Sean.

[richard armstrong]

Richard,
There is a plan for a built up wing for the Greenley which shows the flaps or you can go with foam wings, i got mine cut by Bill at http://www.billkits.com He cut the wings for my Greenley and Lowley.


Sean.

i was thing foam wings to keep weight down, bu i do want 2 wing setup with tube, for transport

not sure, wood or foam?

what sis they cost u to get cut?

[sean smith]

Had mine cut about five years ago, can't remember how much they cost must have been around the £55 - £60 range. If you are going with foam wings you'll need to add some ply ribs in the wings for the joining tube so it may be best to go with a built up wing?
Both my wings are one piece with fiber-glassed centres.

Sean.

[John Greenfield]

Richard

The built up wing is lighter than the foam one and also much easier to make 2 piece as all the holes for the joiner tube are already shown on the plan. The joiner tube is a standard item from SLEC.

Why would you want to change the undercarriage or lighten the model ? Please explain what experience you have to ascertain the existing design, of which hundreds have been built, is in any way inadequate.

The undercarriage has been designed to integrate into the model and produce a light and strong solution. To just bolt an ali or carbon unit onto the bottom will not produce a strong structure and is likely to pull out of the bottom of the model in a less than perfect landing unless you do significant beefing up of the fuz and mounting plate which seems to go against your wish to make it lighter. Unless you are going to mould or fold your own U/C you will also find that the wheels are too far forward if you bolt a standard U/C to the model but I am sure if you are capable of making decisions to change the design you will understand how not having the wheels in the right place on any model will affect the ground handling and landings.

My strong advice to you is to pick your balsa wood for the tail carefully (not to heavy) and build it as per the plan.

John

[richard armstrong]

john

The built up wing is lighter than the foam one and also much easier to make 2 piece as all the holes for the joiner tube are already shown on the plan. The joiner tube is a standard item from SLEC.

thanks for clearing that up, build up wing it is with flaps,

Why would you want to change the undercarriage

i have a fibreglass and ail cart going spare, not decided on which to use, may even go and use the plan version

or lighten the model ?

to lighten so i can add the undercart, to keep the tail weight down and may have to add lead to nose, depends on the build outcome

u stated that the sd greenly was designed for a z62, and then stated that my 55cc engine would be enough????, the idea of lightening the design, was just to compensate for engine cc performance and size, is this not needed?

The undercarriage has been designed to integrate into the model and produce a light and strong solution. To just bolt an ali or carbon unit onto the bottom will not produce a strong structure and is likely to pull out of the bottom of the model in a less than perfect landing unless you do significant beefing up of the fuz and mounting plate which seems to go against your wish to make it lighter. Unless you are going to mould or fold your own U/C you will also find that the wheels are too far forward if you bolt a standard U/C to the model but I am sure if you are capable of making decisions to change the design you will understand how not having the wheels in the right place on any model will affect the ground handling and landings.

my idea was to use an ali or FG, under-cart, to fG, the mount plate, this was to compensate for a lighter engine i am intending on using, less lead, if possible, i may have to bend my own undercart , but i have a few ideas, and properly go with the plan to start with, just kicking ideas around, and trying to use what i have spare in the workshop, to stop form having to chuck away or sell

[John Greenfield]

Richard

You have answered most of your own questions but with regard to the power of your 55, the Zenoah is a great motor but by modern standards is not that powerful but even so it will haul an SD Greenley straight up indefinitely and even do it with a small glider on the back so your 55 will be more than enough for normal sport flying.

If you are concerned about the difference in weight between the Zenoah and your motor a more efficient solution rather than putting lead in the nose is to pick soft balsa for the tail and if you are still worried lengthen the nose between F1 and F2 by 25mm to move your motor further forward, but this should not be necessary. We have an SD Greenely in the Team with a DLE 55 on the front and with the radio batteries just behind the firewall under the tank it balances fine.

John

[paul hughes]

hey Richard (Dick), just stop f-in around and build the thing! hundreds of these models have been built and they all fly fantastic, if you stick to the plan, no matter what wieght they come out at or how much lead is neaded to balance the plane.

[Bob Thompson1894]

[paul needham]

Richard, why change a plane design that is well proven and flys great ? If you want something different to the Greenley why not design and build from scratch ?

[richard armstrong]

hi all

its finally coming together the SDgreanley 88" parts are being assembled,

i would to ask advice on size servos to use in the greenley in kg

i am looking to us wing servos of 7kg for ailerons, standard 8-12kg for rudder?? and 5-7kg all metal gear for elevator,

just wondering if this too much and over kill, or no enough

what would you recommend?

[sean smith]

Hi Richard,
I've just used standard Futaba S3001 in my Greenley and Lowley apart from the rudder servos which are Hi-Tec 645MG's. Never had any problems with theses servos but i do only use my models for sport flying and not towing.

Sean.

[richard armstrong]

my intention is to use my greenley as a trainer and basic aerobatics

so i was just basic 5kg MG servos will do and a 10kg mg for rudder,

i have some of these in stock

thanks

sean