* Estimated delivery times start from the date of shipment, excluding processing time.
* Actual delivery times may vary due to holidays, weather conditions, or customs delays.
Weromstjoer items wurde oanfurden binnen 40 dagen as is de datum fan ûntfangst fan de guod. Oanpaste items kinne net werom wurde stjoerd of wiksele wurde. Items kocht mei in e-kado kaart binne allinich wikselber; weromstjoeringen binne net fan tapassing.
Frij Kado
Wolkom by Roymall, jo profesjonele webside foar it keapjen fan premium ôfdieling winkel kado's. Wy weardearje en wurdearje jo stipe, en wy wolle ús tankberens út troch in ekstra oanset fan opwining oan jo oankeapen ta te foegjen. As jo mei ús winkelje, krije jo net allinnich hege kwaliteit produkten dy't jo libbensstyl ferbetterje, mar jo sille ek in eksklusyf frij kado mei elke oardering dy't jo pleatse. Ree om ús kolleksje te ferkenjen en jo perfekte kado's te finen? Blêdzje troch ús seleksje fan premium ôfdieling winkel items, pleats jo oardering, en sjoch út nei de opwining fan jo frij kado dat mei jo oankeap arriveart.
Ferstjoer Belied
Wy sille hurd wurkje om items nei jo te besoargjen nei it ûntfangen fan jo oarders en soargje dat se feilich oankomme. Leveringsdetails sille wurde ferskate yn jo befêstiging e-mail.Yn de measte gefallen wurde oarders ferwurke binnen 2 dagen.Under spesjale omstannichheden sil it ferlet wurde as folget: As jo in oardering pleatse op sneon, snein of offisjele feestdagen, sil it ferlet wurde foar 2 dagen..Normaalwei hat it 5-7 wurkdagen (moandei oant freed) nedich sûnder te wurden beynfloede troch fleantúch fertraging of oare miljeu faktoaren..Om't ús ferstjoer tsjinst wrâldwiid is, sille de leveringstiden ôfhinklik wêze fan jo lokaasje, sadat it in pear kear nedich wêze kin en wachtsje as jo yn ôfhandige distrikten of lannen binne.
1. Weromstjoer & Wiksel Belied
Wy akseptearje allinich items kocht fan roymall.com. As jo keapje fan ús lokale distributers of oare detailhandelaren, kinne jo se net weromstjoere op ús side.Lêste ferkeap items of frije kado's binne net akseptabel foar in weromstjoer.Om yn oanmerking te kommen foar in weromstjoer, moat jo item ûnbrûkt wêze en yn deselde steat dat jo it ûntfongen hawwe. It moat ek yn de orizjinele ferpakking wêze.Nei it ûntfangen fan weromstjoer ynstruksjes fan ús, pakket jo weromstjoerde items yn en droech jo pakket ôf by it lokale postkantoar of in oare koerier. Wy sille jo weromstjoer of wiksel item ferwurkje binnen 3-5 wurkdagen nei't wy it ûntfange. De weromstjoering sil wurde ferwurke en automatysk kreditearre oan jo orizjinele betelmiddel.Gjin weromstjoeringen of wiksel kinne akseptearre wurde as it produkt oanpast waard produsearre, ynklusyf oanpaste maat, oanpaste kleur, of oanpaste printe.Mear help nedich, nim dan kontakt mei ús op. service@roymall.com of Whatsapp: +447549870296
2.Weromstjoer Belied
Jo krije in folsleine weromstjoering of 100% winkel kredyt nei't wy it weromstjoerde pakket ûntfange en it kontrolearje. De weromstjoering sil wurde ferwurke en automatysk kreditearre oan jo orizjinele betelmiddel.Tink derom dat ferstjoerkosten en eventuele rjochten of fergoedingen net weromstjoerd wurde kinne. De ekstra ferstjoerkosten binne net weromstjoerdber as it pakket al ferstjoerd is. Jo binne ferantwurdlik foar it beteljen fan dizze kosten en wy kinne se net ôfslachtigje of weromstjoere, sels as de oardering weromstjoerd wurdt nei ús. As wy jo weromstjoerde item ûntfongen hawwe en befêstige, stjoere wy jo in e-mail om jo te warskôgjen dat wy jo weromstjoerde item ûntfongen hawwe. Wy sille jo ek ynformearje oer de goedkarring of ôfkarring fan jo weromstjoering.As jo problemen hawwe mei it weromstjoer proses, nim dan kontakt mei ús op. service@roymall.com of Whatsapp: +447549870296
Stirling Engine Model Vacuum Motor Model Kit
Description:
Engine Model Vacuum Motor Model Kit
Features:
With the help of the flywheels, then a net conversion of heat energy to mechanical work. Mechanical work through small generators produce electricity to power a light bulb.
Can be used for teaching purpose.
What is the Stirling Engine?
A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work.The engine is like a steam engine in that all of the engine's heat flows in and out through the engine wall.
How it works?
This is traditionally known as an external combustion engine in contrast to an internal combustion engine where the heat input is by combustion of a fuel within the body of the working fluid. Unlike the steam engine's use of water in both its liquid and gaseous phases as the working fluid, the Stirling engine encloses a fixed quantity of permanently gaseous fluid such as air or helium. As in all heat engines, the general cycle consists of compressing cool gas, heating the gas, expanding the hot gas, and finally cooling the gas before repeating the cycle.
Двигатель полностью выполняет свою учебно- познавательную функцию. Качество изготовления на высоте, внешний вид очень, как по мне, приятный.
Оси вращения крепятся через миниатюрные подшипники. Вращение всех узлов двигателя плавное и тихое. Сборка отличная, все чистое, никаких отпечатков пальцев, потеков масла, грязи и т.д. Просто идеально. Основные материалы – сталь, маховики дюраль, противовесы – латунь.
Двигатель полностью выполняет свою учебно- познавательную функцию. Качество изготовления на высоте, внешний вид очень, как по мне, приятный.
Оси вращения крепятся через миниатюрные подшипники. Вращение всех узлов двигателя плавное и тихое. Сборка отличная, все чистое, никаких отпечатков пальцев, потеков масла, грязи и т.д. Просто идеально. Основные материалы – сталь, маховики дюраль, противовесы – латунь.
Двигатель полностью выполняет свою учебно- познавательную функцию. Качество изготовления на высоте, внешний вид очень, как по мне, приятный.
Оси вращения крепятся через миниатюрные подшипники. Вращение всех узлов двигателя плавное и тихое. Сборка отличная, все чистое, никаких отпечатков пальцев, потеков масла, грязи и т.д. Просто идеально. Основные материалы – сталь, маховики дюраль, противовесы – латунь.
This is a vacuum engine. When properly adjusted it works well
On mine the round rod at the top, the one that moves the hole covering leaf type valve, needed to be adjusted. This can be done by holding the levers at the side with thumb and forefinger of one hand while moving the round rod slightly up or down. When moving the flywheel counterclockwise, a cliciking soind should be heard.
One needs to play with it by trial and error until the motor runs well. The hole in the front needs to be completely covered when in the lower position.
This is a vacuum engine. When properly adjusted it works well
On mine the round rod at the top, the one that moves the hole covering leaf type valve, needed to be adjusted. This can be done by holding the levers at the side with thumb and forefinger of one hand while moving the round rod slightly up or down. When moving the flywheel counterclockwise, a cliciking soind should be heard.
One needs to play with it by trial and error until the motor runs well. The hole in the front needs to be completely covered when in the lower position.
This is a vacuum engine. When properly adjusted it works well
On mine the round rod at the top, the one that moves the hole covering leaf type valve, needed to be adjusted. This can be done by holding the levers at the side with thumb and forefinger of one hand while moving the round rod slightly up or down. When moving the flywheel counterclockwise, a cliciking soind should be heard.
One needs to play with it by trial and error until the motor runs well. The hole in the front needs to be completely covered when in the lower position.
Tips:For questions about your order, place of delivery, product discount, taxation, delivery time, warranty, shipping, payment, exchange rate, and other questions unrelated to the product, please contact customer service.
Para esta pergunta você pode enviar e-mail para nós: cservice@banggood.com Obrigado pelo seu apoio. A propósito, há um cupom de 20% de desconto para esta página de coleta. (código do cupom: 20toys) https://www.banggood.com/Collection-6243.html
Para esta pergunta você pode enviar e-mail para nós: cservice@banggood.com Obrigado pelo seu apoio. A propósito, há um cupom de 20% de desconto para esta página de coleta. (código do cupom: 20toys) https://www.banggood.com/Collection-6243.html