In almost all CL scale events you need effective throttle control to get competative marks.  There are rare exceptions such as 1/2A and a local "old time" scale event.  But in general, throttle control is the key element in flying scale.

Back when I first entered The Brodak I used a none-throttle model just to participate.  I got 55 points out of a possible 100.  The next year the same plane with a throttle got 94. 

In AMA or FAI you can still enter if you can't do the required number of options, but you will not score well.

In almost all CL scale events you need effective throttle control to get competative marks.  There are rare exceptions such as 1/2A and a local "old time" scale event.  But in general, throttle control is the key element in flying scale.

Back when I first entered The Brodak I used a none-throttle model just to participate.  I got 55 points out of a possible 100.  The next year the same plane with a throttle got 94. 

In AMA or FAI you can still enter if you can't do the required number of options, but you will not score well.

i am aweare of that, but still my doubt is: how we score a take off of unthrottled models? only 50% of the total K factor? i am asking because as seems obvious to use throttle, some of competitors donīt use them here ( and i canīt discourage the few contestants to enter competition)
do the taxi count as optional maneuver or is it part of the take off / landing pattern?

Just for everyone's reference, Fred's question is about FAI F4B rules, not AMA.  Here is a link to the FAI rules - https://www.fai.org/sites/default/files/sc4_vol_f4_scale_23.pdf.

Fred - as many of the comments stated, competing with an aircraft without throttle control is very challenging.  The F4B rules penalize this very heavily.
- Takeoff would be scored zero because the model would need to be held by a person.  Section 6.2C.3. states 3. If held or touched by anyone during the manoeuvre, the score is zero.
- Landing would be downgraded because the engine would be stopped.  Section 6.2C.6. lists an error 9. Engine(s) stops before the landing manoeuvre is finished.

Section 6.2.7 describes the Optional Demonstrations.  There is a list of optional demonstrations to choose from.  If a pilot only chooses three optional demonstrations, then the fourth is scored zero.  There are some very simple optional demonstrations that most models can achieve, including high flight, and lazy eight.

So while you can enter a model without throttle control, it is impossible to achieve decent flight scores without using a throttle.  Note that throttle control is much easier now since 2.4 GHz radio control equipment is allowed for secondary control functions (see section 6.2.2.d).  In the US, the majority of models at the Nats use 2.4 GHz radio to control throttle (and it is the only way to control with electric motors).

Let me know if you have any other questions. 

Just for everyone's reference, Fred's question is about FAI F4B rules, not AMA.  Here is a link to the FAI rules - https://www.fai.org/sites/default/files/sc4_vol_f4_scale_23.pdf.

Fred - as many of the comments stated, competing with an aircraft without throttle control is very challenging.  The F4B rules penalize this very heavily.
- Takeoff would be scored zero because the model would need to be held by a person.  Section 6.2C.3. states 3. If held or touched by anyone during the manoeuvre, the score is zero.
- Landing would be downgraded because the engine would be stopped.  Section 6.2C.6. lists an error 9. Engine(s) stops before the landing manoeuvre is finished.

Section 6.2.7 describes the Optional Demonstrations.  There is a list of optional demonstrations to choose from.  If a pilot only chooses three optional demonstrations, then the fourth is scored zero.  There are some very simple optional demonstrations that most models can achieve, including high flight, and lazy eight.

So while you can enter a model without throttle control, it is impossible to achieve decent flight scores without using a throttle.  Note that throttle control is much easier now since 2.4 GHz radio control equipment is allowed for secondary control functions (see section 6.2.2.d).  In the US, the majority of models at the Nats use 2.4 GHz radio to control throttle (and it is the only way to control with electric motors).

Let me know if you have any other questions.

Seems a very comprehensive answer. As said of the 17 'optional' elements 4 need to be selected and notified prior to flight and carried out in the selected order. Owing to the low numbers in your competitions and the fact that few if any have throttle control, i'd suggest omitting this and elements affected by it from your scoring schedule or award everyone the same score that shows no favoritism even though not FAI rules!

Seems a very comprehensive answer. As said of the 17 'optional' elements 4 need to be selected and notified prior to flight and carried out in the selected order. Owing to the low numbers in your competitions and the fact that few if any have throttle control, i'd suggest omitting this and elements affected by it from your scoring schedule or award everyone the same score that shows no favoritism even though not FAI rules!

i had briefed pilots with that information, but i wanted tobe sure i wasnīt following wrong rule interpretation
thanks a lot guys!

With the equipment on sale today there is no barrier to throttle control.  All engines are sold as "RC" engines with factory throttles and mufflers.

A perfectly adequate car controller is sold for $25.  You still need a $4 servo and battery pack.  A 4.6 to 6.6 volt battery pack can be had for under $20.  I do just fine a throwaway pack of four AAA's.

This plane was built for WWII combat and stunt and retrofitted to Fun Scale as descibed.

Fred lives in Brazil, which has some pretty difficult import restrictions.  He has mentioned difficulty with finding stuff before.

So, yes, here in the US of A it's easy and cheap to get gear.  But you can't assume that's the case everywhere.

Yeah, well, most of this stuff comes from China.  Does China not do business with Brazil?

Fred lives in Brazil, which has some pretty difficult import restrictions.  He has mentioned difficulty with finding stuff before.

So, yes, here in the US of A it's easy and cheap to get gear.  But you can't assume that's the case everywhere.

exactly Tim, we do have the goodies but the import taxes arer 100% over the product cost + shipping cost
then we have a cambio rate of 5,6:1